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+$Descr A4 11693 8268
+encoding utf-8
+Sheet 6 6
+Title ""
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+Comment4 ""
+$EndDescr
+Text HLabel 3900 3350 0 50 Input ~ 0
+V_in
+Text HLabel 4450 3350 2 50 Input ~ 0
+V_out
+Text HLabel 4150 3650 0 50 BiDi ~ 0
+GND
+$EndSCHEMATC
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+$EndDescr
+Text HLabel 3900 3350 0 50 Input ~ 0
+V_in
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+V_out
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+GND
+$EndSCHEMATC
--- /dev/null
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Connector_Conn_WallPlug
+#
+DEF Connector_Conn_WallPlug P 0 0 Y Y 1 F N
+F0 "P" -50 175 50 H V C BNN
+F1 "Connector_Conn_WallPlug" -225 0 50 V V C BNN
+F2 "" 400 0 50 H I C CNN
+F3 "" 400 0 50 H I C CNN
+DRAW
+A -125 0 150 -899 899 0 1 10 f -125 -150 -125 150
+P 2 0 1 20 -175 -100 -25 -100 N
+P 2 0 1 20 -175 100 -25 100 N
+P 2 0 1 10 -125 -150 -125 150 N
+P 2 0 1 0 -25 -100 100 -100 N
+P 2 0 1 0 -25 100 100 100 N
+X AC_P 1 200 100 200 L 50 50 1 1 w
+X AC_N 2 200 -100 200 L 50 50 1 1 w
+ENDDRAW
+ENDDEF
+#
+# Connector_USB_A
+#
+DEF Connector_USB_A J 0 40 Y Y 1 F N
+F0 "J" -200 450 50 H V L CNN
+F1 "Connector_USB_A" -200 350 50 H V L CNN
+F2 "" 150 -50 50 H I C CNN
+F3 "" 150 -50 50 H I C CNN
+$FPLIST
+ USB*
+$ENDFPLIST
+DRAW
+C -150 85 25 0 1 10 F
+C -25 135 15 0 1 10 F
+S -200 -300 200 300 0 1 10 f
+S -60 190 -170 210 0 1 0 F
+S -50 180 -180 230 0 1 0 N
+S -5 -300 5 -270 0 1 0 N
+S 10 50 -20 20 0 1 10 F
+S 200 -105 170 -95 0 1 0 N
+S 200 -5 170 5 0 1 0 N
+S 200 195 170 205 0 1 0 N
+P 4 0 1 10 -125 85 -100 85 -50 135 -25 135 N
+P 4 0 1 10 -100 85 -75 85 -50 35 0 35 N
+P 4 0 1 10 25 110 25 60 75 85 25 110 F
+P 2 1 1 10 -75 85 25 85 N
+X VBUS 1 300 200 100 L 50 50 1 1 W
+X D- 2 300 -100 100 L 50 50 1 1 P
+X D+ 3 300 0 100 L 50 50 1 1 P
+X GND 4 0 -400 100 U 50 50 1 1 W
+X Shield 5 -100 -400 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_C
+#
+DEF Device_C C 0 10 N Y 1 F N
+F0 "C" 25 100 50 H V L CNN
+F1 "Device_C" 25 -100 50 H V L CNN
+F2 "" 38 -150 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ C_*
+$ENDFPLIST
+DRAW
+P 2 0 1 20 -80 -30 80 -30 N
+P 2 0 1 20 -80 30 80 30 N
+X ~ 1 0 150 110 D 50 50 1 1 P
+X ~ 2 0 -150 110 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_D_Bridge_+-AA
+#
+DEF Device_D_Bridge_+-AA D 0 0 Y Y 1 F N
+F0 "D" 100 275 50 H V L CNN
+F1 "Device_D_Bridge_+-AA" 100 200 50 H V L CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ D*Bridge*
+ D*Rectifier*
+$ENDFPLIST
+DRAW
+C -200 0 10 0 1 0 F
+C 0 -200 10 0 1 0 F
+C 0 200 10 0 1 0 F
+C 200 0 10 0 1 0 F
+P 2 0 1 10 -100 150 -50 100 N
+P 2 0 1 10 -50 -100 -100 -150 N
+P 2 0 1 10 100 -50 150 -100 N
+P 2 0 1 10 100 50 150 100 N
+P 4 0 1 10 -150 100 -100 50 -75 125 -150 100 N
+P 4 0 1 10 -100 -50 -150 -100 -75 -125 -100 -50 N
+P 4 0 1 10 50 100 100 150 125 75 50 100 N
+P 4 0 1 10 125 -75 50 -100 100 -150 125 -75 N
+P 5 0 1 0 -200 0 0 -200 200 0 0 200 -200 0 N
+X + 1 300 0 100 L 50 50 1 1 P
+X - 2 -300 0 100 R 50 50 1 1 P
+X ~~ 3 0 300 100 D 50 50 1 1 P
+X ~~ 4 0 -300 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_R
+#
+DEF Device_R R 0 0 N Y 1 F N
+F0 "R" 80 0 50 V V C CNN
+F1 "Device_R" 0 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ R_*
+$ENDFPLIST
+DRAW
+S -40 -100 40 100 0 1 10 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Transformer_1P_1S
+#
+DEF Device_Transformer_1P_1S T 0 40 Y N 1 F N
+F0 "T" 0 250 50 H V C CNN
+F1 "Device_Transformer_1P_1S" 0 -300 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+A -100 -150 50 899 1 0 1 0 N -100 -100 -50 -150
+A -100 -150 50 -1 -899 0 1 0 N -50 -150 -100 -199
+A -100 -50 50 899 1 0 1 0 N -100 0 -50 -50
+A -100 -50 50 -1 -899 0 1 0 N -50 -50 -100 -99
+A -100 50 50 899 1 0 1 0 N -100 100 -50 50
+A -100 50 50 -1 -899 0 1 0 N -50 50 -100 1
+A -100 150 50 899 1 0 1 0 N -100 200 -50 150
+A -100 150 50 -1 -899 0 1 0 N -50 150 -100 101
+A 100 -50 50 899 -1799 0 1 0 N 100 0 51 -50
+A 100 -50 50 1799 -899 0 1 0 N 51 -50 100 -99
+A 100 50 50 899 -1799 0 1 0 N 100 100 51 50
+A 100 50 50 1799 -899 0 1 0 N 51 50 100 1
+A 100 150 50 899 -1799 0 1 0 N 100 200 51 150
+A 100 150 50 1799 -899 0 1 0 N 51 150 100 101
+A 101 -150 50 910 -1799 0 1 0 N 101 -100 52 -150
+A 101 -150 50 -912 -1799 0 1 0 N 101 -199 52 -150
+P 2 0 1 0 -25 200 -25 -200 N
+P 2 0 1 0 25 -200 25 200 N
+X AA 1 -400 200 300 R 50 50 1 1 P
+X AB 2 -400 -200 300 R 50 50 1 1 P
+X SA 3 400 -200 300 L 50 50 1 1 P
+X SB 4 400 200 300 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Voltmeter_DC
+#
+DEF Device_Voltmeter_DC MES 0 1 N N 1 F N
+F0 "MES" -130 40 50 H V R CNN
+F1 "Device_Voltmeter_DC" -130 -30 50 H V R CNN
+F2 "" 0 100 50 V I C CNN
+F3 "" 0 100 50 V I C CNN
+DRAW
+C 0 0 100 0 1 10 N
+T 0 0 0 100 0 0 0 V Normal 0 C C
+P 2 0 0 0 -125 -125 -75 -75 N
+P 2 0 0 0 75 75 125 125 N
+P 3 0 0 0 75 125 125 125 125 75 N
+P 2 0 1 0 10 150 30 150 N
+P 2 0 1 0 20 160 20 140 N
+X - 1 0 -200 100 U 50 50 1 1 P
+X + 2 0 200 100 D 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Regulator_Linear_LM317_3PinPackage
+#
+DEF Regulator_Linear_LM317_3PinPackage U 0 10 Y Y 1 F N
+F0 "U" -150 125 50 H V C CNN
+F1 "Regulator_Linear_LM317_3PinPackage" 0 125 50 H V L CNN
+F2 "" 0 250 50 H I C CIN
+F3 "" 0 0 50 H I C CNN
+ALIAS AZ1117-ADJ
+$FPLIST
+ SOT?223*
+ SOT?89*
+ TO?220*
+ TO?252*
+ TO?263*
+$ENDFPLIST
+DRAW
+S -200 75 200 -200 0 1 10 f
+X ADJ 1 0 -300 100 U 50 50 1 1 I
+X VO 2 300 0 100 L 50 50 1 1 w
+X VI 3 -300 0 100 R 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+# Switch_SW_DPST
+#
+DEF Switch_SW_DPST SW 0 0 Y N 1 F N
+F0 "SW" 0 200 50 H V C CNN
+F1 "Switch_SW_DPST" 0 -200 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+C -80 -100 20 0 0 0 N
+C -80 100 20 0 0 0 N
+C 80 -100 20 0 0 0 N
+C 80 100 20 0 0 0 N
+P 2 0 0 0 -60 -90 50 -40 N
+P 2 0 0 0 -60 110 50 160 N
+P 2 0 0 0 0 -50 0 -25 N
+P 2 0 0 0 0 0 0 25 N
+P 2 0 0 0 0 50 0 75 N
+P 2 0 0 0 0 100 0 125 N
+X 1 1 -200 -100 100 R 50 50 1 1 P
+X 2 2 200 -100 100 L 50 50 1 1 P
+X 3 3 -200 100 100 R 50 50 1 1 P
+X 4 4 200 100 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# power_GND
+#
+DEF power_GND #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -250 50 H I C CNN
+F1 "power_GND" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
+X GND 1 0 0 0 D 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+#End Library
--- /dev/null
+(kicad_pcb (version 4) (host kicad "dummy file") )
--- /dev/null
+update=22/05/2015 07:44:53
+version=1
+last_client=kicad
+[general]
+version=1
+RootSch=
+BoardNm=
+[pcbnew]
+version=1
+LastNetListRead=
+UseCmpFile=1
+PadDrill=0.600000000000
+PadDrillOvalY=0.600000000000
+PadSizeH=1.500000000000
+PadSizeV=1.500000000000
+PcbTextSizeV=1.500000000000
+PcbTextSizeH=1.500000000000
+PcbTextThickness=0.300000000000
+ModuleTextSizeV=1.000000000000
+ModuleTextSizeH=1.000000000000
+ModuleTextSizeThickness=0.150000000000
+SolderMaskClearance=0.000000000000
+SolderMaskMinWidth=0.000000000000
+DrawSegmentWidth=0.200000000000
+BoardOutlineThickness=0.100000000000
+ModuleOutlineThickness=0.150000000000
+[cvpcb]
+version=1
+NetIExt=net
+[eeschema]
+version=1
+LibDir=
+[eeschema/libraries]
--- /dev/null
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--- /dev/null
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+$Descr A4 11693 8268
+encoding utf-8
+Sheet 6 6
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+$EndSCHEMATC
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 6 6
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
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+U 1 1 5F0CC9AF
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+F 0 "J1" H 2807 2117 50 0000 C CNN
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+F 3 " ~" H 2900 1600 50 0001 C CNN
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+$EndComp
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+F 0 "J4" H 3607 2117 50 0000 C CNN
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+$EndComp
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+$EndComp
+$Comp
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+$EndSCHEMATC
--- /dev/null
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+encoding utf-8
+Sheet 3 6
+Title ""
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--- /dev/null
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--- /dev/null
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--- /dev/null
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+F 2 "" H 5538 2550 50 0001 C CNN
+F 3 "~" H 5500 2700 50 0001 C CNN
+ 1 5500 2700
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 4050 2450 4050 3050
+Wire Wire Line
+ 4050 3050 5500 3050
+Wire Wire Line
+ 5500 3050 5500 2850
+Wire Wire Line
+ 4650 2450 5500 2450
+Wire Wire Line
+ 5500 2450 5500 2550
+Text HLabel 5800 2450 2 50 Output ~ 0
++30V
+Wire Wire Line
+ 5800 2450 5500 2450
+Connection ~ 5500 2450
+Text HLabel 5800 3050 2 50 Output ~ 0
+GND
+Wire Wire Line
+ 5500 3050 5800 3050
+Connection ~ 5500 3050
+Wire Wire Line
+ 4350 2150 4350 1650
+Wire Wire Line
+ 3950 2250 3950 1650
+Wire Wire Line
+ 3400 2250 3950 2250
+$EndSCHEMATC
--- /dev/null
+<!doctype html>
+<html lang="en">
+<head>
+<title>Battery charger and dual power supply unit</title>
+<!-- 2021-01-03 P 00:39 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="generator" content="Org-mode">
+<meta name="author" content="Svjatoslav Agejenko">
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+<body>
+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">Battery charger and dual power supply unit</h1>
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.
+</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.
+</li>
+
+<li>Authors:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+<ul class="org-ul">
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
+</li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+
+<li>Valeria Agejenko
+</li>
+</ul>
+</li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a>
+</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+I needed dual voltage power supply for my lab that runs on mains
+electricity (wall power) and slowly charges (use-changing) attached
+12V Lead-Acid battery. Lead-acid battery in turn provides high current
+when needed as well as power in portable situations or when mains
+electricity is not available.
+</p>
+
+
+<figure>
+<p><img src="make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+
+<p>
+Power supply provides about 13 Volts and 5 Volts simultaneously.
+</p>
+
+<p>
+<b>!!!WARNING!!!</b> <a href="../alternative%20USB%20layout/">Alternative and incompatible USB wiring/layout</a> is
+being used here.
+</p>
+
+<p>
+<b>Normal USB devices and cables should not be plugged in! It would
+damage device/cable and likely power supply.</b>
+</p>
+
+<p>
+I found USB-A connectors to be easily available, cheap, reliable and
+functional, so I re-purposed connector for my own needs but I'm using
+totally incompatible electrical wiring.
+</p>
+
+
+<figure>
+<p><img src="../alternative%20USB%20layout/schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+</figure>
+
+<p>
+As seen, it has dual voltage output. Additionally one wire is
+dedicated to data transmission and can be used with <a href="https://en.wikipedia.org/wiki/1-Wire">1-Wire</a> protocol
+</p>
+
+<p>
+1-Wire data router/hub is really simple. Power supply simply passively
+links all data wires together.
+</p>
+
+<p>
+Power supply uses 3D printed body with lots of holes, for fanless
+cooling.
+</p>
+
+
+<figure>
+<p><img src="body%20and%20covers/body,%201.png" class="img-responsive" alt="body,%201.png">
+</p>
+</figure>
+
+<p>
+Various modules are realized on top of prototype PCBs that slide into
+dedicated rails within the body.
+</p>
+
+
+<figure>
+<p><img src="body%20and%20covers/body,%202.png" class="img-responsive" alt="body,%202.png">
+</p>
+</figure>
+
+<p>
+Like this:
+</p>
+
+
+<figure>
+<p><img src="make,%202.png" class="img-responsive" alt="make,%202.png">
+</p>
+</figure>
+
+<p>
+When cover is closed, it blocks PCB movement:
+</p>
+
+
+<figure>
+<p><img src="body%20and%20covers/cover.png" class="img-responsive" alt="cover.png">
+</p>
+</figure>
+
+<p>
+There is still some empty space inside, so why not add dummy cover on
+top that can be replaced later with add-on functionality/expansion
+board/terminal :)
+</p>
+
+
+<figure>
+<p><img src="body%20and%20covers/cover%20cover.png" class="img-responsive" alt="cover%20cover.png">
+</p>
+</figure>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="body%20and%20covers/body.stl">Body STL file</a>
+</li>
+<li><a href="body%20and%20covers/cover.stl">Big cover STL file</a>
+</li>
+<li><a href="body%20and%20covers/cover%20cover.stl">Small dummy cover on top, STL file</a>
+</li>
+<li><a href="body%20and%20covers/body%20and%20covers.FCStd">Body and covers FreeCAD project</a>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-3" class="outline-2">
+<h2 id="sec-3"><span class="section-number-2">3</span> Transformer and AC to DC converter</h2>
+<div class="outline-text-2" id="text-3">
+<p>
+This is where high voltage from mains electricity enters the system.
+</p>
+
+<p>
+Schematic:
+<img src="transformer%20and%20AC%20DC%20converter%20board/schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+
+<p>
+For safety I kept high voltage section as minimal as possible. That
+is, wall plug runs straight into transformer. Also I used <a href="https://www.amazon.de/gp/product/B07VGQKM3G/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1">UV hardening
+glue</a> for extra safety and isolation on PCB.
+</p>
+
+<p>
+Power on/off switch operates on already reduced voltage of about 30
+volts. Power switch is located on <a href="#sec-6">indicator panel</a>.
+</p>
+
+
+<figure>
+<p><img src="transformer%20and%20AC%20DC%20converter%20board/make,%201.png" class="img-responsive" alt="make,%201.png">
+</p>
+</figure>
+
+<p>
+DC current of about 30 volts is then routed to <a href="#sec-4">Main board</a>.
+</p>
+
+
+<figure>
+<p><img src="transformer%20and%20AC%20DC%20converter%20board/make,%202.png" class="img-responsive" alt="make,%202.png">
+</p>
+</figure>
+
+<p>
+<a href="https://www.amazon.de/gp/product/B07RLQH5TR/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1">Single sided prototype PCB is used</a>.
+</p>
+</div>
+</div>
+
+<div id="outline-container-sec-4" class="outline-2">
+<h2 id="sec-4"><a id="ID-65d68227-4bf2-4c4f-b4d3-c390bc6a9c34" name="ID-65d68227-4bf2-4c4f-b4d3-c390bc6a9c34"></a><span class="section-number-2">4</span> Main board</h2>
+<div class="outline-text-2" id="text-4">
+<p>
+This is logically main board because it appears to be central hub that
+connects all components. It also houses 2 <a href="https://www.amazon.de/gp/product/B072MQYJ93/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1">adjustable DC-DC Step Down
+voltage converters</a>.
+</p>
+
+
+<figure>
+<p><img src="main%20board/main%20board,%201.png" class="img-responsive" alt="main%20board,%201.png">
+</p>
+</figure>
+
+<p>
+High-level schematic of entire device:
+<img src="main%20board/schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+
+<p>
+As seen from schematic, ~30 volts DC from transformer board is routed
+into first step-down converter that reduces it to about 15V. Reduced
+voltage is then directed to <a href="#sec-5">Current limiter circuit</a>. Current limiter
+loses about 2 volts. Now we have current and voltage limited power at
+about 13 volts. This power is used to charge connected 12V Lead-Acid
+battery. Also the same power is routed to <a href="#sec-7">connector terminal</a> to be
+consumed by connected devices.
+</p>
+
+<p>
+As seen from this schematic, device is not meant to provide high
+current for long periods of time. Instead it gets comparatively
+limited current to charge the battery and feed devices with low
+current requirements. Occasional current spikes are backed up by
+battery that stays in use-changing mode.
+</p>
+
+<p>
+Also about 13V output voltage is approximate and depends on connected
+battery charge level.
+</p>
+
+<p>
+Second Step-Down converter reduces voltage even further to quite
+precisely 5V DC. This resulting voltage is also routed to <a href="#sec-7">connector
+terminal</a>.
+</p>
+
+<p>
+Both 13V and 5V lines are also routed to <a href="#sec-6">indicator panel</a> for
+monitoring.
+</p>
+
+<p>
+There is single on/off switch. In off position, it disconnects battery
+and transformer from the system effectively powering everything down.
+</p>
+
+<p>
+On schematic above, some wires are annotated with numbers from 1
+to 13. This corresponds to output pins on the board.
+</p>
+
+
+<figure>
+<p><img src="main%20board/main%20board,%202.png" class="img-responsive" alt="main%20board,%202.png">
+</p>
+</figure>
+</div>
+</div>
+<div id="outline-container-sec-5" class="outline-2">
+<h2 id="sec-5"><a id="ID-afc22d23-9bc4-421c-9cac-e0ce34bd36bc" name="ID-afc22d23-9bc4-421c-9cac-e0ce34bd36bc"></a><span class="section-number-2">5</span> Current limiter</h2>
+<div class="outline-text-2" id="text-5">
+<p>
+Schematic:
+<img src="current%20limiter/schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+
+<p>
+Simple LM317 based current limiter is used. I used 4.7 ohm
+resistor. It provides about 265 milliamps of current. See <a href="http://www.reuk.co.uk/wordpress/electric-circuit/lm317-current-calculator/">calculator</a>.
+</p>
+
+
+<figure>
+<p><img src="current%20limiter/current%20limiter,%201.png" class="img-responsive" alt="current%20limiter,%201.png">
+</p>
+</figure>
+
+<p>
+Thermal paste below and UV hardening glue on top is used to attach
+LM317 to the heatsink. There is also jumper-like solution on top
+right. This is handy to attach multimeter tap to verify/monitor
+current during initial device calibration.
+</p>
+
+<p>
+If attached battery is really empty, significant voltage drop can
+occur in LM317. Heatsink is needed to dissipate that power.
+</p>
+
+
+<figure>
+<p><img src="current%20limiter/current%20limiter,%202.png" class="img-responsive" alt="current%20limiter,%202.png">
+</p>
+</figure>
+
+<p>
+Note: resistor gets hot too.
+</p>
+</div>
+</div>
+
+<div id="outline-container-sec-6" class="outline-2">
+<h2 id="sec-6"><a id="ID-c9a69490-f920-4a31-b32e-b101bfc3d01b" name="ID-c9a69490-f920-4a31-b32e-b101bfc3d01b"></a><span class="section-number-2">6</span> Indicator panel</h2>
+<div class="outline-text-2" id="text-6">
+
+<figure>
+<p><img src="indicator%20panel/indicator%20panel,%201.png" class="img-responsive" alt="indicator%20panel,%201.png">
+</p>
+</figure>
+
+<p>
+Basically 2 digital DC voltmeters and main on/off switch.
+</p>
+
+
+<figure>
+<p><img src="indicator%20panel/indicator%20panel,%202.png" class="img-responsive" alt="indicator%20panel,%202.png">
+</p>
+</figure>
+
+<p>
+Download:
+</p>
+
+
+<figure>
+<p><img src="indicator%20panel/indicator%20panel.png" class="img-responsive" alt="indicator%20panel.png">
+</p>
+</figure>
+
+<ul class="org-ul">
+<li><a href="indicator%20panel/indicator%20panel.stl">STL file</a>
+</li>
+<li><a href="indicator%20panel/indicator%20panel.FCStd">FreeCAD project</a>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-7" class="outline-2">
+<h2 id="sec-7"><a id="ID-e33940bd-652f-4ec0-b53b-1c03e16941c8" name="ID-e33940bd-652f-4ec0-b53b-1c03e16941c8"></a><span class="section-number-2">7</span> Connector terminal</h2>
+<div class="outline-text-2" id="text-7">
+<p>
+Schematic:
+<img src="connector%20terminal/schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+
+<p>
+As seen above, most of the USB connectors are used to deliver dual
+power output and 1-wire data connectivity, except one on the bottom
+right. This is used to attach 12V battery. Some capacitors are thrown
+in as well to stabilize against smaller current spikes.
+</p>
+
+<p>
+Electrically schematic is realized using smaller prototype PCBs.
+</p>
+
+
+<figure>
+<p><img src="connector%20terminal/make,%201.png" class="img-responsive" alt="make,%201.png">
+</p>
+</figure>
+
+
+<p>
+Those PCBs are wired to central small PCB that acts as a hub:
+</p>
+
+
+<figure>
+<p><img src="connector%20terminal/make,%202.png" class="img-responsive" alt="make,%202.png">
+</p>
+</figure>
+
+<p>
+PCBs are held together by being sandwiched between front panel:
+</p>
+
+
+<figure>
+<p><img src="connector%20terminal/front%20panel.png" class="img-responsive" alt="front%20panel.png">
+</p>
+</figure>
+
+<p>
+and smaller back-end plate:
+</p>
+
+
+<figure>
+<p><img src="connector%20terminal/back%20panel.png" class="img-responsive" alt="back%20panel.png">
+</p>
+</figure>
+
+<p>
+Result:
+</p>
+
+
+<figure>
+<p><img src="connector%20terminal/make,%203.png" class="img-responsive" alt="make,%203.png">
+</p>
+</figure>
+
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="connector%20terminal/front%20panel.stl">front panel STL</a>
+</li>
+<li><a href="connector%20terminal/back%20panel.stl">back panel STL</a>
+</li>
+<li><a href="connector%20terminal/connector%20terminal.FCStd">FreeCAD project</a>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-8" class="outline-2">
+<h2 id="sec-8"><span class="section-number-2">8</span> Calibration</h2>
+<div class="outline-text-2" id="text-8">
+<p>
+Since device uses adjustable step-down modules, these need to be
+calibrated to provide correct output voltage. It is important that
+battery receives proper charging voltage otherwise either no charging
+occurs or battery starts gassing out and gets destroyed.
+</p>
+
+<p>
+See here for more details: <a href="https://www.powerstream.com/SLA.htm">https://www.powerstream.com/SLA.htm</a>
+</p>
+
+<hr >
+
+<p>
+Happy building! :)
+</p>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. General</a></li>
+<li><a href="#sec-2">2. Project description</a></li>
+<li><a href="#sec-3">3. Transformer and AC to DC converter</a></li>
+<li><a href="#sec-4">4. Main board</a></li>
+<li><a href="#sec-5">5. Current limiter</a></li>
+<li><a href="#sec-6">6. Indicator panel</a></li>
+<li><a href="#sec-7">7. Connector terminal</a></li>
+<li><a href="#sec-8">8. Calibration</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2021-01-03 P 00:39</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
+</div>
+</footer>
+</body>
+</html>
--- /dev/null
+#+TITLE: Battery charger and dual power supply unit
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Authors:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
+ - Valeria Agejenko
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+I needed dual voltage power supply for my lab that runs on mains
+electricity (wall power) and slowly charges (use-changing) attached
+12V Lead-Acid battery. Lead-acid battery in turn provides high current
+when needed as well as power in portable situations or when mains
+electricity is not available.
+
+[[file:make.png]]
+
+Power supply provides about 13 Volts and 5 Volts simultaneously.
+
+*!!!WARNING!!!* [[../alternative%20USB%20layout/][Alternative and incompatible USB wiring/layout]] is
+being used here.
+
+*Normal USB devices and cables should not be plugged in! It would
+damage device/cable and likely power supply.*
+
+I found USB-A connectors to be easily available, cheap, reliable and
+functional, so I re-purposed connector for my own needs but I'm using
+totally incompatible electrical wiring.
+
+[[file:../alternative%20USB%20layout/schematic.png]]
+
+As seen, it has dual voltage output. Additionally one wire is
+dedicated to data transmission and can be used with [[https://en.wikipedia.org/wiki/1-Wire][1-Wire]] protocol
+
+1-Wire data router/hub is really simple. Power supply simply passively
+links all data wires together.
+
+Power supply uses 3D printed body with lots of holes, for fanless
+cooling.
+
+[[file:body%20and%20covers/body,%201.png]]
+
+Various modules are realized on top of prototype PCBs that slide into
+dedicated rails within the body.
+
+[[file:body%20and%20covers/body,%202.png]]
+
+Like this:
+
+[[file:make,%202.png]]
+
+When cover is closed, it blocks PCB movement:
+
+[[file:body%20and%20covers/cover.png]]
+
+There is still some empty space inside, so why not add dummy cover on
+top that can be replaced later with add-on functionality/expansion
+board/terminal :)
+
+[[file:body%20and%20covers/cover%20cover.png]]
+
+Download:
++ [[file:body%20and%20covers/body.stl][Body STL file]]
++ [[file:body%20and%20covers/cover.stl][Big cover STL file]]
++ [[file:body%20and%20covers/cover%20cover.stl][Small dummy cover on top, STL file]]
++ [[file:body%20and%20covers/body%20and%20covers.FCStd][Body and covers FreeCAD project]]
+
+* Transformer and AC to DC converter
+
+This is where high voltage from mains electricity enters the system.
+
+Schematic:
+[[file:transformer%20and%20AC%20DC%20converter%20board/schematic.png]]
+
+For safety I kept high voltage section as minimal as possible. That
+is, wall plug runs straight into transformer. Also I used [[https://www.amazon.de/gp/product/B07VGQKM3G/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1][UV hardening
+glue]] for extra safety and isolation on PCB.
+
+Power on/off switch operates on already reduced voltage of about 30
+volts. Power switch is located on [[id:c9a69490-f920-4a31-b32e-b101bfc3d01b][indicator panel]].
+
+[[file:transformer%20and%20AC%20DC%20converter%20board/make,%201.png]]
+
+DC current of about 30 volts is then routed to [[id:65d68227-4bf2-4c4f-b4d3-c390bc6a9c34][Main board]].
+
+[[file:transformer%20and%20AC%20DC%20converter%20board/make,%202.png]]
+
+[[https://www.amazon.de/gp/product/B07RLQH5TR/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1][Single sided prototype PCB is used]].
+
+* Main board
+:PROPERTIES:
+:ID: 65d68227-4bf2-4c4f-b4d3-c390bc6a9c34
+:END:
+
+This is logically main board because it appears to be central hub that
+connects all components. It also houses 2 [[https://www.amazon.de/gp/product/B072MQYJ93/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1][adjustable DC-DC Step Down
+voltage converters]].
+
+[[file:main%20board/main%20board,%201.png]]
+
+High-level schematic of entire device:
+[[file:main%20board/schematic.png]]
+
+As seen from schematic, ~30 volts DC from transformer board is routed
+into first step-down converter that reduces it to about 15V. Reduced
+voltage is then directed to [[id:afc22d23-9bc4-421c-9cac-e0ce34bd36bc][Current limiter circuit]]. Current limiter
+loses about 2 volts. Now we have current and voltage limited power at
+about 13 volts. This power is used to charge connected 12V Lead-Acid
+battery. Also the same power is routed to [[id:e33940bd-652f-4ec0-b53b-1c03e16941c8][connector terminal]] to be
+consumed by connected devices.
+
+As seen from this schematic, device is not meant to provide high
+current for long periods of time. Instead it gets comparatively
+limited current to charge the battery and feed devices with low
+current requirements. Occasional current spikes are backed up by
+battery that stays in use-changing mode.
+
+Also about 13V output voltage is approximate and depends on connected
+battery charge level.
+
+Second Step-Down converter reduces voltage even further to quite
+precisely 5V DC. This resulting voltage is also routed to [[id:e33940bd-652f-4ec0-b53b-1c03e16941c8][connector
+terminal]].
+
+Both 13V and 5V lines are also routed to [[id:c9a69490-f920-4a31-b32e-b101bfc3d01b][indicator panel]] for
+monitoring.
+
+There is single on/off switch. In off position, it disconnects battery
+and transformer from the system effectively powering everything down.
+
+On schematic above, some wires are annotated with numbers from 1
+to 13. This corresponds to output pins on the board.
+
+[[file:main%20board/main%20board,%202.png]]
+* Current limiter
+:PROPERTIES:
+:ID: afc22d23-9bc4-421c-9cac-e0ce34bd36bc
+:END:
+
+Schematic:
+[[file:current%20limiter/schematic.png]]
+
+Simple LM317 based current limiter is used. I used 4.7 ohm
+resistor. It provides about 265 milliamps of current. See [[http://www.reuk.co.uk/wordpress/electric-circuit/lm317-current-calculator/][calculator]].
+
+[[file:current%20limiter/current%20limiter,%201.png]]
+
+Thermal paste below and UV hardening glue on top is used to attach
+LM317 to the heatsink. There is also jumper-like solution on top
+right. This is handy to attach multimeter tap to verify/monitor
+current during initial device calibration.
+
+If attached battery is really empty, significant voltage drop can
+occur in LM317. Heatsink is needed to dissipate that power.
+
+[[file:current%20limiter/current%20limiter,%202.png]]
+
+Note: resistor gets hot too.
+
+* Indicator panel
+:PROPERTIES:
+:ID: c9a69490-f920-4a31-b32e-b101bfc3d01b
+:END:
+
+[[file:indicator%20panel/indicator%20panel,%201.png]]
+
+Basically 2 digital DC voltmeters and main on/off switch.
+
+[[file:indicator%20panel/indicator%20panel,%202.png]]
+
+Download:
+
+[[file:indicator%20panel/indicator%20panel.png]]
+
++ [[file:indicator%20panel/indicator%20panel.stl][STL file]]
++ [[file:indicator%20panel/indicator%20panel.FCStd][FreeCAD project]]
+
+* Connector terminal
+:PROPERTIES:
+:ID: e33940bd-652f-4ec0-b53b-1c03e16941c8
+:END:
+
+Schematic:
+[[file:connector%20terminal/schematic.png]]
+
+As seen above, most of the USB connectors are used to deliver dual
+power output and 1-wire data connectivity, except one on the bottom
+right. This is used to attach 12V battery. Some capacitors are thrown
+in as well to stabilize against smaller current spikes.
+
+Electrically schematic is realized using smaller prototype PCBs.
+
+[[file:connector%20terminal/make,%201.png]]
+
+
+Those PCBs are wired to central small PCB that acts as a hub:
+
+[[file:connector%20terminal/make,%202.png]]
+
+PCBs are held together by being sandwiched between front panel:
+
+[[file:connector%20terminal/front%20panel.png]]
+
+and smaller back-end plate:
+
+[[file:connector%20terminal/back%20panel.png]]
+
+Result:
+
+[[file:connector%20terminal/make,%203.png]]
+
+
+Download:
++ [[file:connector%20terminal/front%20panel.stl][front panel STL]]
++ [[file:connector%20terminal/back%20panel.stl][back panel STL]]
++ [[file:connector%20terminal/connector%20terminal.FCStd][FreeCAD project]]
+
+* Calibration
+
+Since device uses adjustable step-down modules, these need to be
+calibrated to provide correct output voltage. It is important that
+battery receives proper charging voltage otherwise either no charging
+occurs or battery starts gassing out and gets destroyed.
+
+See here for more details: https://www.powerstream.com/SLA.htm
+
+-----
+
+Happy building! :)
--- /dev/null
+
+
+Thermistor used: UEI005 (NTC Thermistor)
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 3
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$EndSCHEMATC
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 3
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$EndSCHEMATC
--- /dev/null
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Connector_USB_A
+#
+DEF Connector_USB_A J 0 40 Y Y 1 F N
+F0 "J" -200 450 50 H V L CNN
+F1 "Connector_USB_A" -200 350 50 H V L CNN
+F2 "" 150 -50 50 H I C CNN
+F3 "" 150 -50 50 H I C CNN
+$FPLIST
+ USB*
+$ENDFPLIST
+DRAW
+C -150 85 25 0 1 10 F
+C -25 135 15 0 1 10 F
+S -200 -300 200 300 0 1 10 f
+S -60 190 -170 210 0 1 0 F
+S -50 180 -180 230 0 1 0 N
+S -5 -300 5 -270 0 1 0 N
+S 10 50 -20 20 0 1 10 F
+S 200 -105 170 -95 0 1 0 N
+S 200 -5 170 5 0 1 0 N
+S 200 195 170 205 0 1 0 N
+P 4 0 1 10 -125 85 -100 85 -50 135 -25 135 N
+P 4 0 1 10 -100 85 -75 85 -50 35 0 35 N
+P 4 0 1 10 25 110 25 60 75 85 25 110 F
+P 2 1 1 10 -75 85 25 85 N
+X VBUS 1 300 200 100 L 50 50 1 1 W
+X D- 2 300 -100 100 L 50 50 1 1 B
+X D+ 3 300 0 100 L 50 50 1 1 B
+X GND 4 0 -400 100 U 50 50 1 1 W
+X Shield 5 -100 -400 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Battery
+#
+DEF Device_Battery BT 0 0 N N 1 F N
+F0 "BT" 100 100 50 H V L CNN
+F1 "Device_Battery" 100 0 50 H V L CNN
+F2 "" 0 60 50 V I C CNN
+F3 "" 0 60 50 V I C CNN
+DRAW
+S -80 -55 80 -65 0 1 0 F
+S -80 70 80 60 0 1 0 F
+S -52 -78 50 -98 0 1 0 F
+S -52 47 50 27 0 1 0 F
+P 2 0 1 0 0 -60 0 -50 N
+P 2 0 1 0 0 -40 0 -30 N
+P 2 0 1 0 0 -20 0 -10 N
+P 2 0 1 0 0 0 0 10 N
+P 2 0 1 0 0 20 0 30 N
+P 2 0 1 0 0 70 0 100 N
+P 2 0 1 10 10 105 50 105 N
+P 2 0 1 10 30 125 30 85 N
+X + 1 0 200 100 D 50 50 1 1 P
+X - 2 0 -200 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_C
+#
+DEF Device_C C 0 10 N Y 1 F N
+F0 "C" 25 100 50 H V L CNN
+F1 "Device_C" 25 -100 50 H V L CNN
+F2 "" 38 -150 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ C_*
+$ENDFPLIST
+DRAW
+P 2 0 1 20 -80 -30 80 -30 N
+P 2 0 1 20 -80 30 80 30 N
+X ~ 1 0 150 110 D 50 50 1 1 P
+X ~ 2 0 -150 110 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_L
+#
+DEF Device_L L 0 40 N N 1 F N
+F0 "L" -50 0 50 V V C CNN
+F1 "Device_L" 75 0 50 V V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Choke_*
+ *Coil*
+ Inductor_*
+ L_*
+$ENDFPLIST
+DRAW
+A 0 -75 25 -899 899 0 1 0 N 0 -100 0 -50
+A 0 -25 25 -899 899 0 1 0 N 0 -50 0 0
+A 0 25 25 -899 899 0 1 0 N 0 0 0 50
+A 0 75 25 -899 899 0 1 0 N 0 50 0 100
+X 1 1 0 150 50 D 50 50 1 1 P
+X 2 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# power_GND
+#
+DEF power_GND #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -250 50 H I C CNN
+F1 "power_GND" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
+X GND 1 0 0 0 D 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+#End Library
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 3
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L Connector:USB_A J?
+U 1 1 6066D5F2
+P 2550 3250
+F 0 "J?" H 2607 3717 50 0000 C CNN
+F 1 "USB_A" H 2607 3626 50 0000 C CNN
+F 2 "" H 2700 3200 50 0001 C CNN
+F 3 " ~" H 2700 3200 50 0001 C CNN
+ 1 2550 3250
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:L L?
+U 1 1 6066E023
+P 3150 3050
+F 0 "L?" V 2969 3050 50 0000 C CNN
+F 1 "L" V 3060 3050 50 0000 C CNN
+F 2 "" H 3150 3050 50 0001 C CNN
+F 3 "~" H 3150 3050 50 0001 C CNN
+ 1 3150 3050
+ 0 1 1 0
+$EndComp
+$Comp
+L Device:C C?
+U 1 1 6066E800
+P 3400 3450
+F 0 "C?" H 3515 3496 50 0000 L CNN
+F 1 "C" H 3515 3405 50 0000 L CNN
+F 2 "" H 3438 3300 50 0001 C CNN
+F 3 "~" H 3400 3450 50 0001 C CNN
+ 1 3400 3450
+ 1 0 0 -1
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 6066F429
+P 3400 3800
+F 0 "#PWR?" H 3400 3550 50 0001 C CNN
+F 1 "GND" H 3405 3627 50 0000 C CNN
+F 2 "" H 3400 3800 50 0001 C CNN
+F 3 "" H 3400 3800 50 0001 C CNN
+ 1 3400 3800
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 3400 3800 3400 3600
+Wire Wire Line
+ 3400 3300 3400 3050
+Wire Wire Line
+ 3400 3050 3300 3050
+Wire Wire Line
+ 3000 3050 2850 3050
+$Comp
+L power:GND #PWR?
+U 1 1 6066F9FA
+P 2550 3800
+F 0 "#PWR?" H 2550 3550 50 0001 C CNN
+F 1 "GND" H 2555 3627 50 0000 C CNN
+F 2 "" H 2550 3800 50 0001 C CNN
+F 3 "" H 2550 3800 50 0001 C CNN
+ 1 2550 3800
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 2550 3800 2550 3650
+$Sheet
+S 3700 2900 1200 450
+U 6066FDCB
+F0 "Voltage upstep" 50
+F1 "upstep.sch" 50
+F2 "Vin" I L 3700 3050 50
+F3 "Vout" O R 4900 3050 50
+$EndSheet
+Wire Wire Line
+ 3400 3050 3700 3050
+Connection ~ 3400 3050
+$Comp
+L Device:C C?
+U 1 1 6067078E
+P 5100 3500
+F 0 "C?" H 5215 3546 50 0000 L CNN
+F 1 "C" H 5215 3455 50 0000 L CNN
+F 2 "" H 5138 3350 50 0001 C CNN
+F 3 "~" H 5100 3500 50 0001 C CNN
+ 1 5100 3500
+ 1 0 0 -1
+$EndComp
+$Sheet
+S 5300 2900 1100 450
+U 60670C08
+F0 "charger" 50
+F1 "changer.sch" 50
+F2 "Vin" I L 5300 3050 50
+F3 "Vout" O R 6400 3050 50
+$EndSheet
+Wire Wire Line
+ 4900 3050 5100 3050
+Wire Wire Line
+ 5100 3050 5100 3350
+Wire Wire Line
+ 5100 3050 5300 3050
+Connection ~ 5100 3050
+$Comp
+L Device:Battery BT?
+U 1 1 6067194B
+P 6600 3450
+F 0 "BT?" H 6708 3496 50 0000 L CNN
+F 1 "Battery" H 6708 3405 50 0000 L CNN
+F 2 "" V 6600 3510 50 0001 C CNN
+F 3 "~" V 6600 3510 50 0001 C CNN
+ 1 6600 3450
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
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+Wire Wire Line
+ 6600 3050 6400 3050
+$Comp
+L power:GND #PWR?
+U 1 1 6067278E
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+F 0 "#PWR?" H 6600 3500 50 0001 C CNN
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+F 2 "" H 6600 3750 50 0001 C CNN
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+ 1 6600 3750
+ 1 0 0 -1
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 60672D3C
+P 5100 3750
+F 0 "#PWR?" H 5100 3500 50 0001 C CNN
+F 1 "GND" H 5105 3577 50 0000 C CNN
+F 2 "" H 5100 3750 50 0001 C CNN
+F 3 "" H 5100 3750 50 0001 C CNN
+ 1 5100 3750
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 5100 3750 5100 3650
+Wire Wire Line
+ 6600 3750 6600 3650
+$EndSCHEMATC
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 3
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L Connector:USB_A J?
+U 1 1 6066D5F2
+P 2550 3250
+F 0 "J?" H 2607 3717 50 0000 C CNN
+F 1 "USB_A" H 2607 3626 50 0000 C CNN
+F 2 "" H 2700 3200 50 0001 C CNN
+F 3 " ~" H 2700 3200 50 0001 C CNN
+ 1 2550 3250
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:L L?
+U 1 1 6066E023
+P 3150 3050
+F 0 "L?" V 2969 3050 50 0000 C CNN
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+F 2 "" H 3150 3050 50 0001 C CNN
+F 3 "~" H 3150 3050 50 0001 C CNN
+ 1 3150 3050
+ 0 1 1 0
+$EndComp
+$Comp
+L Device:C C?
+U 1 1 6066E800
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+F 0 "C?" H 3515 3396 50 0000 L CNN
+F 1 "C" H 3515 3305 50 0000 L CNN
+F 2 "" H 3438 3200 50 0001 C CNN
+F 3 "~" H 3400 3350 50 0001 C CNN
+ 1 3400 3350
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+$Comp
+L power:GND #PWR?
+U 1 1 6066F429
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+F 0 "#PWR?" H 3400 3450 50 0001 C CNN
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+F 2 "" H 3400 3700 50 0001 C CNN
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+Wire Wire Line
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+L power:GND #PWR?
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+F 2 "" H 2550 3800 50 0001 C CNN
+F 3 "" H 2550 3800 50 0001 C CNN
+ 1 2550 3800
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+Wire Wire Line
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+F1 "upstep.sch" 50
+F2 "Vin" I L 3700 3050 50
+F3 "Vout" O R 4900 3050 50
+$EndSheet
+Wire Wire Line
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+Connection ~ 3400 3050
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+L Device:C C?
+U 1 1 6067078E
+P 5100 3600
+F 0 "C?" H 5215 3646 50 0000 L CNN
+F 1 "C" H 5215 3555 50 0000 L CNN
+F 2 "" H 5138 3450 50 0001 C CNN
+F 3 "~" H 5100 3600 50 0001 C CNN
+ 1 5100 3600
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+$Sheet
+S 5300 2900 1100 450
+U 60670C08
+F0 "charger" 50
+F1 "changer.sch" 50
+F2 "Vin" I L 5300 3050 50
+F3 "Vout" O R 6400 3050 50
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+Wire Wire Line
+ 4900 3050 5100 3050
+Wire Wire Line
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+Wire Wire Line
+ 5100 3050 5300 3050
+Connection ~ 5100 3050
+$Comp
+L Device:Battery BT?
+U 1 1 6067194B
+P 6600 3450
+F 0 "BT?" H 6708 3496 50 0000 L CNN
+F 1 "Battery" H 6708 3405 50 0000 L CNN
+F 2 "" V 6600 3510 50 0001 C CNN
+F 3 "~" V 6600 3510 50 0001 C CNN
+ 1 6600 3450
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+$EndComp
+Wire Wire Line
+ 6600 3250 6600 3050
+Wire Wire Line
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+$Comp
+L power:GND #PWR?
+U 1 1 6067278E
+P 6600 3750
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+</head>
+<body>
+<div id="content">
+<h1 class="title">Ham radio battery charger mod</h1>
+<div id="table-of-contents">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents">
+<ul>
+<li><a href="#org6c82e4b">1. General</a></li>
+<li><a href="#orgc5c8965">2. Project description</a></li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-org6c82e4b" class="outline-2">
+<h2 id="org6c82e4b"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.</li>
+
+<li>Authors:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+<ul class="org-ul">
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a></li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a></li>
+</ul></li>
+
+<li>Valeria Agejenko</li>
+</ul></li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a></li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a></li>
+</ul></li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-orgc5c8965" class="outline-2">
+<h2 id="orgc5c8965"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+Warning: this project is quite hacky. It requires breaking original
+charger to get required critical charger part. Instructions are not
+very detailed. Only describe the overall idea. Do not attempt to
+reproduce this unless you exactly know what you are doing.
+</p>
+
+<hr />
+
+
+<p>
+I have Baofeng GT-STP and Baofeng UV-82 radios. Their batteries have
+slightly different geometry, so chargers are physically not
+compatible. Also each changer comes with its own power adapter to plug
+into wall power socket. Electrically batteries are apparently
+compatible.
+</p>
+
+<p>
+By building this battery charger I solved 2 issues:
+</p>
+<ul class="org-ul">
+<li>It can charge batteries for both radios. Is physically and
+electrically compatible to both models.</li>
+<li>Wall adapter is no longer needed. Now it is powered by USB connector
+from computer.</li>
+</ul>
+
+
+<div id="orgef5e369" class="figure">
+<p><img src="make.png" alt="make.png" />
+</p>
+</div>
+
+<p>
+Body ignores small physical differences between batteries and both can
+be plugged in.
+</p>
+
+
+<div id="org17d6a62" class="figure">
+<p><img src="body.png" alt="body.png" />
+</p>
+</div>
+
+<p>
+Front side contains critical fragment of the original changer circuit
+board to drive the actual battery charging.
+</p>
+
+
+<div id="orga02cdec" class="figure">
+<p><img src="make, 1.png" alt="make, 1.png" />
+</p>
+</div>
+
+<p>
+Back side contains voltage upstep converter that is tuned to convert
+5V USB input to 10V output that is required by the charger.
+</p>
+
+
+<div id="org0433379" class="figure">
+<p><img src="make, 2.png" alt="make, 2.png" />
+</p>
+</div>
+
+<p>
+Voltage upstep converter can produce significant voltage
+ripples/impulses that travel backwards to the power source and forward
+to the changer. To reduce this effect, there are capacitors and
+inductor.
+</p>
+
+
+<div id="orgff0d03f" class="figure">
+<p><img src="electrical.png" alt="electrical.png" />
+</p>
+</div>
+
+<p>
+Front and back sides are connected by wiring at the bottom. Also there
+are screws to hold original Baofeng charger pins/springs that connect
+to the battery.
+</p>
+
+
+<div id="orge59d24a" class="figure">
+<p><img src="make, 3.png" alt="make, 3.png" />
+</p>
+</div>
+
+<p>
+After assembly is complete, back, front and bottom parts are sealed
+with lid: <img src="cover.png" alt="cover.png" />
+</p>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2021-04-11 Sun 21:46</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
--- /dev/null
+#+TITLE: Ham radio battery charger mod
+#+author: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Authors:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
+ - Valeria Agejenko
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+
+Warning: this project is quite hacky. It requires breaking original
+charger to get required critical charger part. Instructions are not
+very detailed. Only describe the overall idea. Do not attempt to
+reproduce this unless you exactly know what you are doing.
+
+------
+
+
+I have Baofeng GT-STP and Baofeng UV-82 radios. Their batteries have
+slightly different geometry, so chargers are physically not
+compatible. Also each changer comes with its own power adapter to plug
+into wall power socket. Electrically batteries are apparently
+compatible.
+
+By building this battery charger I solved 2 issues:
++ It can charge batteries for both radios. Is physically and
+ electrically compatible to both models.
++ Wall adapter is no longer needed. Now it is powered by USB connector
+ from computer.
+
+[[file:make.png]]
+
+Body ignores small physical differences between batteries and both can
+be plugged in.
+
+[[file:body.png]]
+
+Front side contains critical fragment of the original changer circuit
+board to drive the actual battery charging.
+
+[[file:make, 1.png]]
+
+Back side contains voltage upstep converter that is tuned to convert
+5V USB input to 10V output that is required by the charger.
+
+[[file:make, 2.png]]
+
+Voltage upstep converter can produce significant voltage
+ripples/impulses that travel backwards to the power source and forward
+to the changer. To reduce this effect, there are capacitors and
+inductor.
+
+[[file:electrical.png]]
+
+Front and back sides are connected by wiring at the bottom. Also there
+are screws to hold original Baofeng charger pins/springs that connect
+to the battery.
+
+[[file:make, 3.png]]
+
+After assembly is complete, back, front and bottom parts are sealed
+with lid: [[file:cover.png]]
--- /dev/null
+<?xml version="1.0" encoding="utf-8"?>
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+<head>
+<!-- 2025-04-07 Mon 02:02 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>Versatile Heating/Cooling Plate with Triple Peltier Elements</title>
+<meta name="author" content="Svjatoslav Agejenko" />
+<meta name="generator" content="Org Mode" />
+<style>
+ #content { max-width: 60em; margin: auto; }
+ .title { text-align: center;
+ margin-bottom: .2em; }
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+ font-size: medium;
+ font-weight: bold;
+ margin-top:0; }
+ .todo { font-family: monospace; color: red; }
+ .done { font-family: monospace; color: green; }
+ .priority { font-family: monospace; color: orange; }
+ .tag { background-color: #eee; font-family: monospace;
+ padding: 2px; font-size: 80%; font-weight: normal; }
+ .timestamp { color: #bebebe; }
+ .timestamp-kwd { color: #5f9ea0; }
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+ #postamble p, #preamble p { font-size: 90%; margin: .2em; }
+ p.verse { margin-left: 3%; }
+ pre {
+ border: 1px solid #e6e6e6;
+ border-radius: 3px;
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+ { background-color: #ffff00; color: #000000; font-weight: bold; }
+ .org-svg { }
+</style>
+<style type="text/css">
+ body {
+ max-width: 35cm !important;
+ }
+ #content {
+ max-width: 80em !important;
+ width: 90%;
+ }
+ </style>
+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
+</head>
+<body>
+<div id="content" class="content">
+<h1 class="title">Versatile Heating/Cooling Plate with Triple Peltier Elements</h1>
+<div id="table-of-contents" role="doc-toc">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents" role="doc-toc">
+<ul>
+<li><a href="#org92c5170">1. Introduction</a></li>
+<li><a href="#org610b00c">2. Files</a>
+<ul>
+<li><a href="#orgd44c2a7">2.1. Main body of the construction</a></li>
+<li><a href="#org9751fa0">2.2. Top cover</a></li>
+<li><a href="#org096b234">2.3. Bottom cover</a></li>
+</ul>
+</li>
+<li><a href="#org42e0221">3. License and Disclaimer</a></li>
+</ul>
+</div>
+</div>
+
+
+<div id="outline-container-org92c5170" class="outline-2">
+<h2 id="org92c5170"><span class="section-number-2">1.</span> Introduction</h2>
+<div class="outline-text-2" id="text-1">
+
+<div id="org34bdb55" class="figure">
+<p><img src="make.png" alt="make.png" />
+</p>
+</div>
+
+<p>
+This is a home-built device that uses <b>three</b> Peltier elements. It can
+electrically switch between heating and cooling mode of operation.
+</p>
+
+<p>
+Possible Applications
+</p>
+<ul class="org-ul">
+<li>Small beverage chiller/warmer to keep a drink cold (or a mug of
+coffee warm) on your desk.</li>
+<li>Science experiments.</li>
+<li>Hobby prototyping: Great for testing sensors or components under
+controlled temperature environments.</li>
+</ul>
+
+<p>
+A <b>Peltier element</b> (also called a thermoelectric cooler or TEC) moves
+heat from one side of the device to the other when powered. If you
+feed the module current in one direction, one side cools while the
+other side heats. Reverse the polarity, and the hot/cold sides flip.
+</p>
+
+<p>
+In short, they offer a neat, compact way to generate small-scale
+heating or cooling without traditional refrigerants or compressors and
+it has no moving parts.
+</p>
+
+<p>
+<b>!WARNING!</b> <a href="https://www3.svjatoslav.eu/projects/physical/misc/alternative%20USB%20layout/">I'm reusing USB-A connector here in completely
+incompatible ways</a> to power current device with 12 volts also from DIY
+power supply. <b>You should never connect this device to normal USB
+power supplies</b> because it likely will destroy it and will be fire
+hazard!
+</p>
+
+
+<p>
+My DIY device consists of the following major parts:
+<img src="schematic.png" alt="schematic.png" />
+</p>
+
+<ul class="org-ul">
+<li>Three Peltier modules, arranged on top of one-another for a higher
+overall cooling/heating capacity.</li>
+<li>A top plate, where items are placed for heating or cooling.</li>
+<li>A fan assembly on the opposite side of the Peltiers to pull air across a heatsink.</li>
+<li>A mode switch (Heating/Cooling), which toggles the polarity of the Peltier elements.</li>
+<li>An On/Off switch that powers the entire system.</li>
+<li>Two indicator LEDs: one lights up for “Heating” mode, the other for
+“Cooling” mode.</li>
+</ul>
+
+<p>
+In simple terms, you have a box with a top-most Peltier element for
+contacting the item to be warmed or cooled. Inside, there’s a set of
+Peltier modules sandwiched between and an internal heatsink, with a
+fan that moves air over the heatsink. The two switches handle power
+and polarity, and the LEDs offer instant visual feedback.
+</p>
+
+<p>
+By wiring three Peltier elements, the cooling/heating capacity is
+effectively multiplied.
+</p>
+
+<p>
+A crucial factor in making Peltiers work well is how effectively you
+dump the waste heat/cold on the opposite end of the Peltier stack into
+the environment. If the hot side is not kept sufficiently cool, the
+effectiveness of the entire module drops.
+</p>
+
+
+<div id="org334d211" class="figure">
+<p><img src="make, bottom.png" alt="make, bottom.png" />
+</p>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org610b00c" class="outline-2">
+<h2 id="org610b00c"><span class="section-number-2">2.</span> Files</h2>
+<div class="outline-text-2" id="text-2">
+<ul class="org-ul">
+<li><a href="Lab heater and cooler.FCStd">FreeCAD design file</a></li>
+</ul>
+
+<p>
+3D printable STL files:
+</p>
+</div>
+
+<div id="outline-container-orgd44c2a7" class="outline-3">
+<h3 id="orgd44c2a7"><span class="section-number-3">2.1.</span> Main body of the construction</h3>
+<div class="outline-text-3" id="text-2-1">
+<p>
+<a href="body.stl">body.stl</a>
+</p>
+
+<ul class="org-ul">
+<li><img src="body, 1.png" alt="body, 1.png" /></li>
+<li><img src="body, 2.png" alt="body, 2.png" /></li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-org9751fa0" class="outline-3">
+<h3 id="org9751fa0"><span class="section-number-3">2.2.</span> Top cover</h3>
+<div class="outline-text-3" id="text-2-2">
+<p>
+<a href="top cover.stl">top cover.stl</a>
+</p>
+
+<ul class="org-ul">
+<li><img src="top cover.png" alt="top cover.png" /></li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-org096b234" class="outline-3">
+<h3 id="org096b234"><span class="section-number-3">2.3.</span> Bottom cover</h3>
+<div class="outline-text-3" id="text-2-3">
+<p>
+<a href="bottom cover.stl">bottom cover.stl</a>
+</p>
+
+<ul class="org-ul">
+<li><img src="bottom cover.png" alt="bottom cover.png" /></li>
+</ul>
+</div>
+</div>
+</div>
+
+
+<div id="outline-container-org42e0221" class="outline-2">
+<h2 id="org42e0221"><span class="section-number-2">3.</span> License and Disclaimer</h2>
+<div class="outline-text-2" id="text-3">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.</li>
+
+<li>Author:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko</li>
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a></li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a></li>
+</ul></li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a></li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a></li>
+</ul></li>
+</ul>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2025-04-07 Mon 02:02</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
--- /dev/null
+#+TITLE: Versatile Heating/Cooling Plate with Triple Peltier Elements
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+
+* Introduction
+
+[[file:make.png]]
+
+This is a home-built device that uses *three* Peltier elements. It can
+electrically switch between heating and cooling mode of operation.
+
+Possible Applications
+- Small beverage chiller/warmer to keep a drink cold (or a mug of
+ coffee warm) on your desk.
+- Science experiments.
+- Hobby prototyping: Great for testing sensors or components under
+ controlled temperature environments.
+
+A *Peltier element* (also called a thermoelectric cooler or TEC) moves
+heat from one side of the device to the other when powered. If you
+feed the module current in one direction, one side cools while the
+other side heats. Reverse the polarity, and the hot/cold sides flip.
+
+In short, they offer a neat, compact way to generate small-scale
+heating or cooling without traditional refrigerants or compressors and
+it has no moving parts.
+
+*!WARNING!* [[https://www3.svjatoslav.eu/projects/physical/misc/alternative%20USB%20layout/][I'm reusing USB-A connector here in completely
+incompatible ways]] to power current device with 12 volts also from DIY
+power supply. *You should never connect this device to normal USB
+power supplies* because it likely will destroy it and will be fire
+hazard!
+
+
+My DIY device consists of the following major parts:
+[[file:schematic.png]]
+
+- Three Peltier modules, arranged on top of one-another for a higher
+ overall cooling/heating capacity.
+- A top plate, where items are placed for heating or cooling.
+- A fan assembly on the opposite side of the Peltiers to pull air across a heatsink.
+- A mode switch (Heating/Cooling), which toggles the polarity of the Peltier elements.
+- An On/Off switch that powers the entire system.
+- Two indicator LEDs: one lights up for “Heating” mode, the other for
+ “Cooling” mode.
+
+In simple terms, you have a box with a top-most Peltier element for
+contacting the item to be warmed or cooled. Inside, there’s a set of
+Peltier modules sandwiched between and an internal heatsink, with a
+fan that moves air over the heatsink. The two switches handle power
+and polarity, and the LEDs offer instant visual feedback.
+
+By wiring three Peltier elements, the cooling/heating capacity is
+effectively multiplied.
+
+A crucial factor in making Peltiers work well is how effectively you
+dump the waste heat/cold on the opposite end of the Peltier stack into
+the environment. If the hot side is not kept sufficiently cool, the
+effectiveness of the entire module drops.
+
+[[file:make, bottom.png]]
+
+* Files
+
++ [[file:Lab heater and cooler.FCStd][FreeCAD design file]]
+
+3D printable STL files:
+
+** Main body of the construction
+[[file:body.stl]]
+
+- [[file:body, 1.png]]
+- [[file:body, 2.png]]
+
+** Top cover
+[[file:top cover.stl]]
+
+- [[file:top cover.png]]
+
+** Bottom cover
+[[file:bottom cover.stl]]
+
+- [[file:bottom cover.png]]
+
+
+* License and Disclaimer
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Author:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
--- /dev/null
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Connector_USB_A
+#
+DEF Connector_USB_A J 0 40 Y Y 1 F N
+F0 "J" -200 450 50 H V L CNN
+F1 "Connector_USB_A" -200 350 50 H V L CNN
+F2 "" 150 -50 50 H I C CNN
+F3 "" 150 -50 50 H I C CNN
+$FPLIST
+ USB*
+$ENDFPLIST
+DRAW
+C -150 85 25 0 1 10 F
+C -25 135 15 0 1 10 F
+S -200 -300 200 300 0 1 10 f
+S -60 190 -170 210 0 1 0 F
+S -50 180 -180 230 0 1 0 N
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+S 10 50 -20 20 0 1 10 F
+S 200 -105 170 -95 0 1 0 N
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+X D+ 3 300 0 100 L 50 50 1 1 B
+X GND 4 0 -400 100 U 50 50 1 1 W
+X Shield 5 -100 -400 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_LED
+#
+DEF Device_LED D 0 40 N N 1 F N
+F0 "D" 0 100 50 H V C CNN
+F1 "Device_LED" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ LED*
+ LED_SMD:*
+ LED_THT:*
+$ENDFPLIST
+DRAW
+P 2 0 1 10 -50 -50 -50 50 N
+P 2 0 1 0 -50 0 50 0 N
+P 4 0 1 10 50 -50 50 50 -50 0 50 -50 N
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+P 5 0 1 0 -70 -30 -130 -90 -100 -90 -130 -90 -130 -60 N
+X K 1 -150 0 100 R 50 50 1 1 P
+X A 2 150 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Peltier_Element
+#
+DEF Device_Peltier_Element PE 0 0 N Y 1 F N
+F0 "PE" 0 125 50 H V C CNN
+F1 "Device_Peltier_Element" 0 -50 50 H V C CNN
+F2 "" 0 -70 50 H I C CNN
+F3 "" 0 25 50 V I C CNN
+DRAW
+S -140 75 -115 0 0 1 0 F
+S -90 75 -65 0 0 1 0 F
+S -15 75 -40 0 0 1 0 F
+S 35 75 10 0 0 1 0 F
+S 60 0 85 75 0 1 0 F
+S 110 0 135 75 0 1 0 F
+P 2 0 1 10 -150 0 150 0 F
+P 2 0 1 10 -150 75 150 75 N
+X ~ 1 -200 0 50 R 50 50 1 1 P
+X ~ 2 200 0 50 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_R
+#
+DEF Device_R R 0 0 N Y 1 F N
+F0 "R" 80 0 50 V V C CNN
+F1 "Device_R" 0 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ R_*
+$ENDFPLIST
+DRAW
+S -40 -100 40 100 0 1 10 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Motor_Fan
+#
+DEF Motor_Fan M 0 0 Y Y 1 F N
+F0 "M" 100 200 50 H V L CNN
+F1 "Motor_Fan" 100 -100 50 H V L TNN
+F2 "" 0 10 50 H I C CNN
+F3 "" 0 10 50 H I C CNN
+$FPLIST
+ PinHeader*P2.54mm*
+ TerminalBlock*
+$ENDFPLIST
+DRAW
+A -98 94 113 297 -910 0 1 0 N 0 150 -100 -20
+A 0 -70 112 1534 266 0 1 0 N -100 -20 100 -20
+A 103 95 115 -915 1519 0 1 0 N 100 -20 0 150
+C 0 40 128 0 1 10 N
+P 2 0 1 0 0 -200 0 -180 N
+P 2 0 1 0 0 -88 0 -104 N
+P 2 0 1 0 0 168 0 182 N
+P 2 0 1 0 0 180 0 200 N
+X + 1 0 300 100 D 50 50 1 1 P
+X - 2 0 -200 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Switch_SW_Push_DPDT
+#
+DEF Switch_SW_Push_DPDT SW 0 0 Y N 1 F N
+F0 "SW" 0 350 50 H V C CNN
+F1 "Switch_SW_Push_DPDT" 0 -400 50 H V C CNN
+F2 "" 0 200 50 H I C CNN
+F3 "" 0 200 50 H I C CNN
+DRAW
+C -80 -200 20 0 0 0 N
+C -80 200 20 0 0 0 N
+C 80 -300 20 0 0 0 N
+C 80 100 20 0 0 0 N
+C 80 -100 20 0 1 0 N
+C 80 300 20 0 1 0 N
+P 2 0 1 0 -60 -190 100 -120 N
+P 2 0 1 0 -60 210 100 280 N
+P 2 0 1 0 0 -90 0 -160 N
+P 2 0 1 0 0 -40 0 0 N
+P 2 0 1 0 0 50 0 90 N
+P 2 0 1 0 0 140 0 180 N
+P 2 0 1 0 0 310 0 240 N
+X A 1 200 300 100 L 50 50 1 1 P
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+X C 3 200 100 100 L 50 50 1 1 P
+X A 4 200 -100 100 L 50 50 1 1 P
+X B 5 -200 -200 100 R 50 50 1 1 P
+X C 6 200 -300 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+#End Library
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 1
+Title ""
+Date ""
+Rev ""
+Comp ""
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+Comment4 ""
+$EndDescr
+$Comp
+L Connector:USB_A J1
+U 1 1 5FC687EA
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+F 0 "J1" H 2007 3467 50 0000 C CNN
+F 1 "USB_A" H 2007 3376 50 0000 C CNN
+F 2 "" H 2100 2950 50 0001 C CNN
+F 3 " ~" H 2100 2950 50 0001 C CNN
+ 1 1950 3000
+ 1 0 0 -1
+$EndComp
+$Comp
+L Switch:SW_Push_DPDT SW1
+U 1 1 5FC6AA51
+P 2550 2950
+F 0 "SW1" H 2550 3435 50 0000 C CNN
+F 1 "SW_ON_OFF" H 2550 3344 50 0000 C CNN
+F 2 "" H 2550 3150 50 0001 C CNN
+F 3 "~" H 2550 3150 50 0001 C CNN
+ 1 2550 2950
+ 1 0 0 -1
+$EndComp
+$Comp
+L Switch:SW_Push_DPDT SW2
+U 1 1 5FC6CF83
+P 3700 3000
+F 0 "SW2" H 3700 3485 50 0000 C CNN
+F 1 "SW_COLD_HOT" H 3700 3394 50 0000 C CNN
+F 2 "" H 3700 3200 50 0001 C CNN
+F 3 "~" H 3700 3200 50 0001 C CNN
+ 1 3700 3000
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
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+Wire Wire Line
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+<!doctype html>
+<html lang="en">
+<head>
+<title>USB desk fan modification</title>
+<!-- 2020-08-10 Mon 07:18 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="generator" content="Org-mode">
+<meta name="author" content="Svjatoslav Agejenko">
+<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
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+<body>
+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">USB desk fan modification</h1>
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.
+</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.
+</li>
+
+<li>Authors:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+<ul class="org-ul">
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
+</li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+
+<li>Valeria Agejenko
+</li>
+</ul>
+</li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a>
+</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+End-result looks like this:
+</p>
+
+
+<figure>
+<p><img src="make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+
+<p>
+It all started with couple of cheap USB desk fans that were a bit too
+noisy:
+</p>
+
+
+<figure>
+<p><img src="mini%20fan.png" class="img-responsive" alt="mini%20fan.png">
+</p>
+</figure>
+
+<p>
+Idea is to add DC-DC step-down converter to reduce motor voltage to
+make it quieter (<a href="https://www.amazon.de/gp/product/B07K3W78SQ/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1">Purchased form here</a>). And since I already have this
+USB powered thing on my desk, why not to share this power to allow
+charging of various other USB powered devices.
+</p>
+
+<p>
+I ended up with this schematic:
+<img src="schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+
+<p>
+USB power of 5 volts that enters the system via DC jack is distributed
+to two USB-A connectors on the front panel. Note: USB data is not
+connected. Therefore this hub is for power sharing only.
+</p>
+
+<p>
+DC-DC fly-back converter could introduce voltage ripple in the
+system. To smooth it out, there is capacitor (C1) and inductor (L1).
+</p>
+
+<p>
+Step-down voltage converter has adjustable output voltage. So after
+assembling, it can be tuned with screw-driver to reach desired
+noise/airflow tradeoff.
+</p>
+
+<p>
+From original fan I kept:
+</p>
+<ul class="org-ul">
+<li>engine
+</li>
+<li>blades
+</li>
+<li>DC jack
+</li>
+<li>on/off swith
+</li>
+</ul>
+
+<p>
+Engine is attached with screws to following back-plate:
+</p>
+
+
+<figure>
+<p><img src="fan%20housing%20-%20fan%20mount.png" class="img-responsive" alt="fan%20housing%20-%20fan%20mount.png">
+</p>
+</figure>
+
+<p>
+And result is encased into pipelike case:
+</p>
+
+
+<figure>
+<p><img src="fan%20housing%20-%20cover%20assembly.png" class="img-responsive" alt="fan%20housing%20-%20cover%20assembly.png">
+</p>
+</figure>
+
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li>STL: <a href="fan%20housing%20-%20fan%20mount.stl">fan mount back plate</a>
+</li>
+<li>STL: <a href="fan%20housing%20-%20cover.stl">pipe-like case</a>
+</li>
+<li><a href="fan%20housing.FCStd">FreeCAD project</a>
+</li>
+</ul>
+
+<p>
+Fan enclosure attaches to the rectangular body below using following
+connector (glued to the fan housing):
+</p>
+
+
+<figure>
+<p><img src="fan%20housing%20connector.png" class="img-responsive" alt="fan%20housing%20connector.png">
+</p>
+</figure>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="fan%20housing%20connector.stl">STL file</a>
+</li>
+<li><a href="fan%20housing%20connector.FCStd">FreeCAD project</a>
+</li>
+</ul>
+
+<p>
+Bottom part to house 2 PCBs, on/off button and DC connector:
+<img src="bottom%20stand%20body.png" class="img-responsive" alt="bottom%20stand%20body.png">
+</p>
+
+<p>
+Component attachment:
+<img src="make,%202.png" class="img-responsive" alt="make,%202.png">
+</p>
+
+<p>
+And is closed by cover:
+<img src="bottom%20stand%20cover%20assembly.png" class="img-responsive" alt="bottom%20stand%20cover%20assembly.png">
+</p>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li>STL: <a href="bottom%20stand%20body.stl">bottom stand body</a>
+</li>
+<li>STL: <a href="bottom%20stand%20cover.stl">bottom%20stand%20cover.stl</a>
+</li>
+<li><a href="bottom%20stand.FCStd">FreeCAD project</a>
+</li>
+</ul>
+
+<p>
+After assembly, it looks like this from the back:
+<img src="make,%203.png" class="img-responsive" alt="make,%203.png">
+</p>
+
+<p>
+Note, part of the body is deformed during printing. I have heated bed
+and I even printed raft support in Cura and it did not help. In my
+experience black PLA filament is awful in comparison to transparent
+one. Has inferior flow (results in slower print speed) and tends to
+deform easily. Will never buy it again.
+</p>
+
+<p>
+Fan top and bottom halves are attached using <a href="https://www.amazon.de/gp/product/B00OOLKD2G/ref=ppx_yo_dt_b_asin_image_o00_s00?ie=UTF8&psc=1">camera tripod quick
+release screw</a>.
+</p>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. General</a></li>
+<li><a href="#sec-2">2. Project description</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2020-08-10 Mon 07:18</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
+</div>
+</footer>
+</body>
+</html>
--- /dev/null
+#+TITLE: USB desk fan modification
+#+author: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Authors:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
+ - Valeria Agejenko
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+End-result looks like this:
+
+[[file:make.png]]
+
+It all started with couple of cheap USB desk fans that were a bit too
+noisy:
+
+[[file:mini%20fan.png]]
+
+Idea is to add DC-DC step-down converter to reduce motor voltage to
+make it quieter ([[https://www.amazon.de/gp/product/B07K3W78SQ/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1][Purchased form here]]). And since I already have this
+USB powered thing on my desk, why not to share this power to allow
+charging of various other USB powered devices.
+
+I ended up with this schematic:
+[[file:schematic.png]]
+
+USB power of 5 volts that enters the system via DC jack is distributed
+to two USB-A connectors on the front panel. Note: USB data is not
+connected. Therefore this hub is for power sharing only.
+
+DC-DC fly-back converter could introduce voltage ripple in the
+system. To smooth it out, there is capacitor (C1) and inductor (L1).
+
+Step-down voltage converter has adjustable output voltage. So after
+assembling, it can be tuned with screw-driver to reach desired
+noise/airflow tradeoff.
+
+From original fan I kept:
++ engine
++ blades
++ DC jack
++ on/off swith
+
+Engine is attached with screws to following back-plate:
+
+[[file:fan%20housing%20-%20fan%20mount.png]]
+
+And result is encased into pipelike case:
+
+[[file:fan%20housing%20-%20cover%20assembly.png]]
+
+
+Download:
++ STL: [[file:fan%20housing%20-%20fan%20mount.stl][fan mount back plate]]
++ STL: [[file:fan%20housing%20-%20cover.stl][pipe-like case]]
++ [[file:fan%20housing.FCStd][FreeCAD project]]
+
+Fan enclosure attaches to the rectangular body below using following
+connector (glued to the fan housing):
+
+[[file:fan%20housing%20connector.png]]
+
+Download:
++ [[file:fan%20housing%20connector.stl][STL file]]
++ [[file:fan%20housing%20connector.FCStd][FreeCAD project]]
+
+Bottom part to house 2 PCBs, on/off button and DC connector:
+[[file:bottom%20stand%20body.png]]
+
+Component attachment:
+[[file:make,%202.png]]
+
+And is closed by cover:
+[[file:bottom%20stand%20cover%20assembly.png]]
+
+Download:
++ STL: [[file:bottom%20stand%20body.stl][bottom stand body]]
++ STL: [[file:bottom%20stand%20cover.stl]]
++ [[file:bottom%20stand.FCStd][FreeCAD project]]
+
+After assembly, it looks like this from the back:
+[[file:make,%203.png]]
+
+Note, part of the body is deformed during printing. I have heated bed
+and I even printed raft support in Cura and it did not help. In my
+experience black PLA filament is awful in comparison to transparent
+one. Has inferior flow (results in slower print speed) and tends to
+deform easily. Will never buy it again.
+
+Fan top and bottom halves are attached using [[https://www.amazon.de/gp/product/B00OOLKD2G/ref=ppx_yo_dt_b_asin_image_o00_s00?ie=UTF8&psc=1][camera tripod quick
+release screw]].
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 2 2
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+Text HLabel 3200 3150 0 50 Input ~ 0
+Vin
+Text HLabel 4050 3150 2 50 Output ~ 0
+Vout
+Text HLabel 3550 3500 0 50 UnSpc ~ 0
+GND
+$EndSCHEMATC
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 2 2
+Title ""
+Date ""
+Rev ""
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+Comment2 ""
+Comment3 ""
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+$EndDescr
+Text HLabel 3200 3150 0 50 Input ~ 0
+Vin
+Text HLabel 4050 3150 2 50 Output ~ 0
+Vout
+Text HLabel 3550 3500 0 50 UnSpc ~ 0
+GND
+$EndSCHEMATC
--- /dev/null
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Connector_Jack-DC
+#
+DEF Connector_Jack-DC J 0 40 Y Y 1 F N
+F0 "J" 0 210 50 H V C CNN
+F1 "Connector_Jack-DC" 0 -200 50 H V C CNN
+F2 "" 50 -40 50 H I C CNN
+F3 "" 50 -40 50 H I C CNN
+ALIAS Jack-DC
+$FPLIST
+ BarrelJack*
+$ENDFPLIST
+DRAW
+A -130 100 25 901 -901 0 1 10 F -130 125 -130 75
+A -130 100 25 901 -901 0 1 10 N -130 125 -130 75
+S -200 150 200 -150 0 1 10 f
+S 145 125 -130 75 0 1 10 F
+P 2 0 1 10 200 100 150 100 N
+P 6 0 1 10 -150 -100 -100 -100 -50 -50 0 -100 100 -100 200 -100 N
+X ~ 1 300 100 100 L 50 50 1 1 P
+X ~ 2 300 -100 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Connector_USB_A
+#
+DEF Connector_USB_A J 0 40 Y Y 1 F N
+F0 "J" -200 450 50 H V L CNN
+F1 "Connector_USB_A" -200 350 50 H V L CNN
+F2 "" 150 -50 50 H I C CNN
+F3 "" 150 -50 50 H I C CNN
+$FPLIST
+ USB*
+$ENDFPLIST
+DRAW
+C -150 85 25 0 1 10 F
+C -25 135 15 0 1 10 F
+S -200 -300 200 300 0 1 10 f
+S -60 190 -170 210 0 1 0 F
+S -50 180 -180 230 0 1 0 N
+S -5 -300 5 -270 0 1 0 N
+S 10 50 -20 20 0 1 10 F
+S 200 -105 170 -95 0 1 0 N
+S 200 -5 170 5 0 1 0 N
+S 200 195 170 205 0 1 0 N
+P 4 0 1 10 -125 85 -100 85 -50 135 -25 135 N
+P 4 0 1 10 -100 85 -75 85 -50 35 0 35 N
+P 4 0 1 10 25 110 25 60 75 85 25 110 F
+P 2 1 1 10 -75 85 25 85 N
+X VBUS 1 300 200 100 L 50 50 1 1 W
+X D- 2 300 -100 100 L 50 50 1 1 P
+X D+ 3 300 0 100 L 50 50 1 1 P
+X GND 4 0 -400 100 U 50 50 1 1 W
+X Shield 5 -100 -400 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_C
+#
+DEF Device_C C 0 10 N Y 1 F N
+F0 "C" 25 100 50 H V L CNN
+F1 "Device_C" 25 -100 50 H V L CNN
+F2 "" 38 -150 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ C_*
+$ENDFPLIST
+DRAW
+P 2 0 1 20 -80 -30 80 -30 N
+P 2 0 1 20 -80 30 80 30 N
+X ~ 1 0 150 110 D 50 50 1 1 P
+X ~ 2 0 -150 110 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_L
+#
+DEF Device_L L 0 40 N N 1 F N
+F0 "L" -50 0 50 V V C CNN
+F1 "Device_L" 75 0 50 V V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Choke_*
+ *Coil*
+ Inductor_*
+ L_*
+$ENDFPLIST
+DRAW
+A 0 -75 25 -899 899 0 1 0 N 0 -100 0 -50
+A 0 -25 25 -899 899 0 1 0 N 0 -50 0 0
+A 0 25 25 -899 899 0 1 0 N 0 0 0 50
+A 0 75 25 -899 899 0 1 0 N 0 50 0 100
+X 1 1 0 150 50 D 50 50 1 1 P
+X 2 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Motor_Fan
+#
+DEF Motor_Fan M 0 0 Y Y 1 F N
+F0 "M" 100 200 50 H V L CNN
+F1 "Motor_Fan" 100 -100 50 H V L TNN
+F2 "" 0 10 50 H I C CNN
+F3 "" 0 10 50 H I C CNN
+$FPLIST
+ PinHeader*P2.54mm*
+ TerminalBlock*
+$ENDFPLIST
+DRAW
+A -98 94 113 297 -910 0 1 0 N 0 150 -100 -20
+A 0 -70 112 1534 266 0 1 0 N -100 -20 100 -20
+A 103 95 115 -915 1519 0 1 0 N 100 -20 0 150
+C 0 40 128 0 1 10 N
+P 2 0 1 0 0 -200 0 -180 N
+P 2 0 1 0 0 -88 0 -104 N
+P 2 0 1 0 0 168 0 182 N
+P 2 0 1 0 0 180 0 200 N
+X + 1 0 300 100 D 50 50 1 1 P
+X - 2 0 -200 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Switch_SW_SPST
+#
+DEF Switch_SW_SPST SW 0 0 Y N 1 F N
+F0 "SW" 0 125 50 H V C CNN
+F1 "Switch_SW_SPST" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+C -80 0 20 0 0 0 N
+C 80 0 20 0 0 0 N
+P 2 0 0 0 -60 10 60 70 N
+X A 1 -200 0 100 R 50 50 1 1 P
+X B 2 200 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# power_GND
+#
+DEF power_GND #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -250 50 H I C CNN
+F1 "power_GND" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
+X GND 1 0 0 0 D 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+#End Library
--- /dev/null
+(kicad_pcb (version 4) (host kicad "dummy file") )
--- /dev/null
+update=22/05/2015 07:44:53
+version=1
+last_client=kicad
+[general]
+version=1
+RootSch=
+BoardNm=
+[pcbnew]
+version=1
+LastNetListRead=
+UseCmpFile=1
+PadDrill=0.600000000000
+PadDrillOvalY=0.600000000000
+PadSizeH=1.500000000000
+PadSizeV=1.500000000000
+PcbTextSizeV=1.500000000000
+PcbTextSizeH=1.500000000000
+PcbTextThickness=0.300000000000
+ModuleTextSizeV=1.000000000000
+ModuleTextSizeH=1.000000000000
+ModuleTextSizeThickness=0.150000000000
+SolderMaskClearance=0.000000000000
+SolderMaskMinWidth=0.000000000000
+DrawSegmentWidth=0.200000000000
+BoardOutlineThickness=0.100000000000
+ModuleOutlineThickness=0.150000000000
+[cvpcb]
+version=1
+NetIExt=net
+[eeschema]
+version=1
+LibDir=
+[eeschema/libraries]
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+F 2 "" H 6400 4300 50 0001 C CNN
+F 3 "" H 6400 4300 50 0001 C CNN
+ 1 6400 4300
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 6400 4300 6400 4100
+$Comp
+L power:GND #PWR?
+U 1 1 5F344A85
+P 6400 3350
+F 0 "#PWR?" H 6400 3100 50 0001 C CNN
+F 1 "GND" H 6405 3177 50 0000 C CNN
+F 2 "" H 6400 3350 50 0001 C CNN
+F 3 "" H 6400 3350 50 0001 C CNN
+ 1 6400 3350
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 6400 3350 6400 3150
+Wire Wire Line
+ 6400 3150 6500 3150
+Wire Wire Line
+ 6400 2850 6400 3150
+Connection ~ 6400 3150
+$EndSCHEMATC
--- /dev/null
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Connector_USB_A
+#
+DEF Connector_USB_A J 0 40 Y Y 1 F N
+F0 "J" -200 450 50 H V L CNN
+F1 "Connector_USB_A" -200 350 50 H V L CNN
+F2 "" 150 -50 50 H I C CNN
+F3 "" 150 -50 50 H I C CNN
+$FPLIST
+ USB*
+$ENDFPLIST
+DRAW
+C -150 85 25 0 1 10 F
+C -25 135 15 0 1 10 F
+S -200 -300 200 300 0 1 10 f
+S -60 190 -170 210 0 1 0 F
+S -50 180 -180 230 0 1 0 N
+S -5 -300 5 -270 0 1 0 N
+S 10 50 -20 20 0 1 10 F
+S 200 -105 170 -95 0 1 0 N
+S 200 -5 170 5 0 1 0 N
+S 200 195 170 205 0 1 0 N
+P 4 0 1 10 -125 85 -100 85 -50 135 -25 135 N
+P 4 0 1 10 -100 85 -75 85 -50 35 0 35 N
+P 4 0 1 10 25 110 25 60 75 85 25 110 F
+P 2 1 1 10 -75 85 25 85 N
+X VBUS 1 300 200 100 L 50 50 1 1 W
+X D- 2 300 -100 100 L 50 50 1 1 P
+X D+ 3 300 0 100 L 50 50 1 1 P
+X GND 4 0 -400 100 U 50 50 1 1 W
+X Shield 5 -100 -400 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Lamp
+#
+DEF Device_Lamp LA 0 1 N N 1 F N
+F0 "LA" 25 150 50 H V L CNN
+F1 "Device_Lamp" 25 -150 50 H V L CNN
+F2 "" 0 100 50 V I C CNN
+F3 "" 0 100 50 V I C CNN
+DRAW
+C 0 0 100 0 1 0 N
+P 2 0 1 0 -70 70 70 -70 N
+P 2 0 1 0 70 70 -70 -70 N
+X - 1 0 -200 100 U 50 50 1 1 P
+X + 2 0 200 100 D 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_R
+#
+DEF Device_R R 0 0 N Y 1 F N
+F0 "R" 80 0 50 V V C CNN
+F1 "Device_R" 0 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ R_*
+$ENDFPLIST
+DRAW
+S -40 -100 40 100 0 1 10 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Switch_SW_SPST
+#
+DEF Switch_SW_SPST SW 0 0 Y N 1 F N
+F0 "SW" 0 125 50 H V C CNN
+F1 "Switch_SW_SPST" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+C -80 0 20 0 0 0 N
+C 80 0 20 0 0 0 N
+P 2 0 0 0 -60 10 60 70 N
+X A 1 -200 0 100 R 50 50 1 1 P
+X B 2 200 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+#End Library
--- /dev/null
+(kicad_pcb (version 4) (host kicad "dummy file") )
--- /dev/null
+update=22/05/2015 07:44:53
+version=1
+last_client=kicad
+[general]
+version=1
+RootSch=
+BoardNm=
+[pcbnew]
+version=1
+LastNetListRead=
+UseCmpFile=1
+PadDrill=0.600000000000
+PadDrillOvalY=0.600000000000
+PadSizeH=1.500000000000
+PadSizeV=1.500000000000
+PcbTextSizeV=1.500000000000
+PcbTextSizeH=1.500000000000
+PcbTextThickness=0.300000000000
+ModuleTextSizeV=1.000000000000
+ModuleTextSizeH=1.000000000000
+ModuleTextSizeThickness=0.150000000000
+SolderMaskClearance=0.000000000000
+SolderMaskMinWidth=0.000000000000
+DrawSegmentWidth=0.200000000000
+BoardOutlineThickness=0.100000000000
+ModuleOutlineThickness=0.150000000000
+[cvpcb]
+version=1
+NetIExt=net
+[eeschema]
+version=1
+LibDir=
+[eeschema/libraries]
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 1
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L Connector:USB_A J1
+U 1 1 5F4101A8
+P 4150 3000
+F 0 "J1" H 4207 3467 50 0000 C CNN
+F 1 "USB_A" H 4207 3376 50 0000 C CNN
+F 2 "" H 4300 2950 50 0001 C CNN
+F 3 " ~" H 4300 2950 50 0001 C CNN
+ 1 4150 3000
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 4450 3100 4550 3100
+Wire Wire Line
+ 4550 3000 4450 3000
+$Comp
+L Switch:SW_SPST SW3
+U 1 1 5F410F20
+P 4750 4400
+F 0 "SW3" H 4750 4635 50 0000 C CNN
+F 1 "SW_SPST" H 4750 4544 50 0000 C CNN
+F 2 "" H 4750 4400 50 0001 C CNN
+F 3 "~" H 4750 4400 50 0001 C CNN
+ 1 4750 4400
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R2
+U 1 1 5F411557
+P 4750 4650
+F 0 "R2" V 4543 4650 50 0000 C CNN
+F 1 "8" V 4634 4650 50 0000 C CNN
+F 2 "" V 4680 4650 50 0001 C CNN
+F 3 "~" H 4750 4650 50 0001 C CNN
+ 1 4750 4650
+ 0 1 1 0
+$EndComp
+Wire Wire Line
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+Wire Wire Line
+ 4550 4650 4600 4650
+$Comp
+L Switch:SW_SPST SW6
+U 1 1 5F4130F6
+P 5250 4400
+F 0 "SW6" H 5250 4635 50 0000 C CNN
+F 1 "SW_SPST" H 5250 4544 50 0000 C CNN
+F 2 "" H 5250 4400 50 0001 C CNN
+F 3 "~" H 5250 4400 50 0001 C CNN
+ 1 5250 4400
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R4
+U 1 1 5F413100
+P 5250 4650
+F 0 "R4" V 5043 4650 50 0000 C CNN
+F 1 "4" V 5134 4650 50 0000 C CNN
+F 2 "" V 5180 4650 50 0001 C CNN
+F 3 "~" H 5250 4650 50 0001 C CNN
+ 1 5250 4650
+ 0 1 1 0
+$EndComp
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
+ 5000 4400 5000 4650
+Connection ~ 5000 4400
+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 5000 4650
+$Comp
+L Switch:SW_SPST SW9
+U 1 1 5F416C6C
+P 5750 4400
+F 0 "SW9" H 5750 4635 50 0000 C CNN
+F 1 "SW_SPST" H 5750 4544 50 0000 C CNN
+F 2 "" H 5750 4400 50 0001 C CNN
+F 3 "~" H 5750 4400 50 0001 C CNN
+ 1 5750 4400
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R6
+U 1 1 5F416C76
+P 5750 4650
+F 0 "R6" V 5543 4650 50 0000 C CNN
+F 1 "2" V 5634 4650 50 0000 C CNN
+F 2 "" V 5680 4650 50 0001 C CNN
+F 3 "~" H 5750 4650 50 0001 C CNN
+ 1 5750 4650
+ 0 1 1 0
+$EndComp
+Wire Wire Line
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+Wire Wire Line
+ 5450 4400 5500 4400
+Wire Wire Line
+ 5500 4400 5500 4650
+Connection ~ 5500 4400
+Wire Wire Line
+ 5500 4400 5550 4400
+Wire Wire Line
+ 5400 4650 5500 4650
+Connection ~ 5500 4650
+$Comp
+L Switch:SW_SPST SW12
+U 1 1 5F41B671
+P 6250 4400
+F 0 "SW12" H 6250 4635 50 0000 C CNN
+F 1 "SW_SPST" H 6250 4544 50 0000 C CNN
+F 2 "" H 6250 4400 50 0001 C CNN
+F 3 "~" H 6250 4400 50 0001 C CNN
+ 1 6250 4400
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R8
+U 1 1 5F41B67B
+P 6250 4650
+F 0 "R8" V 6043 4650 50 0000 C CNN
+F 1 "1" V 6134 4650 50 0000 C CNN
+F 2 "" V 6180 4650 50 0001 C CNN
+F 3 "~" H 6250 4650 50 0001 C CNN
+ 1 6250 4650
+ 0 1 1 0
+$EndComp
+$Comp
+L Switch:SW_SPST SW15
+U 1 1 5F41B686
+P 6750 4400
+F 0 "SW15" H 6750 4635 50 0000 C CNN
+F 1 "SW_SPST" H 6750 4544 50 0000 C CNN
+F 2 "" H 6750 4400 50 0001 C CNN
+F 3 "~" H 6750 4400 50 0001 C CNN
+ 1 6750 4400
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R11
+U 1 1 5F41B690
+P 6750 4650
+F 0 "R11" V 6543 4650 50 0000 C CNN
+F 1 "0.5" V 6634 4650 50 0000 C CNN
+F 2 "" V 6680 4650 50 0001 C CNN
+F 3 "~" H 6750 4650 50 0001 C CNN
+ 1 6750 4650
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 6500 4650 6600 4650
+Wire Wire Line
+ 6450 4400 6500 4400
+Wire Wire Line
+ 6500 4400 6500 4650
+Connection ~ 6500 4400
+Wire Wire Line
+ 6500 4400 6550 4400
+Wire Wire Line
+ 6400 4650 6500 4650
+Connection ~ 6500 4650
+Wire Wire Line
+ 6950 4400 7000 4400
+Wire Wire Line
+ 7000 4400 7000 4650
+Wire Wire Line
+ 6900 4650 7000 4650
+Wire Wire Line
+ 5900 4650 6000 4650
+Wire Wire Line
+ 5950 4400 6000 4400
+Wire Wire Line
+ 6000 4400 6000 4650
+Connection ~ 6000 4400
+Wire Wire Line
+ 6000 4400 6050 4400
+Connection ~ 6000 4650
+Wire Wire Line
+ 6000 4650 6100 4650
+$Comp
+L Switch:SW_SPST SW2
+U 1 1 5F42FD9A
+P 4750 3550
+F 0 "SW2" H 4750 3785 50 0000 C CNN
+F 1 "SW_SPST" H 4750 3694 50 0000 C CNN
+F 2 "" H 4750 3550 50 0001 C CNN
+F 3 "~" H 4750 3550 50 0001 C CNN
+ 1 4750 3550
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R1
+U 1 1 5F42FDA4
+P 4750 3800
+F 0 "R1" V 4543 3800 50 0000 C CNN
+F 1 "256" V 4634 3800 50 0000 C CNN
+F 2 "" V 4680 3800 50 0001 C CNN
+F 3 "~" H 4750 3800 50 0001 C CNN
+ 1 4750 3800
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 4550 3550 4550 3800
+Wire Wire Line
+ 4550 3800 4600 3800
+$Comp
+L Switch:SW_SPST SW5
+U 1 1 5F42FDB0
+P 5250 3550
+F 0 "SW5" H 5250 3785 50 0000 C CNN
+F 1 "SW_SPST" H 5250 3694 50 0000 C CNN
+F 2 "" H 5250 3550 50 0001 C CNN
+F 3 "~" H 5250 3550 50 0001 C CNN
+ 1 5250 3550
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R3
+U 1 1 5F42FDBA
+P 5250 3800
+F 0 "R3" V 5043 3800 50 0000 C CNN
+F 1 "128" V 5134 3800 50 0000 C CNN
+F 2 "" V 5180 3800 50 0001 C CNN
+F 3 "~" H 5250 3800 50 0001 C CNN
+ 1 5250 3800
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 5000 3800 5100 3800
+Wire Wire Line
+ 4950 3550 5000 3550
+Wire Wire Line
+ 5000 3550 5000 3800
+Connection ~ 5000 3550
+Wire Wire Line
+ 5000 3550 5050 3550
+Wire Wire Line
+ 4900 3800 5000 3800
+Connection ~ 5000 3800
+$Comp
+L Switch:SW_SPST SW8
+U 1 1 5F42FDCB
+P 5750 3550
+F 0 "SW8" H 5750 3785 50 0000 C CNN
+F 1 "SW_SPST" H 5750 3694 50 0000 C CNN
+F 2 "" H 5750 3550 50 0001 C CNN
+F 3 "~" H 5750 3550 50 0001 C CNN
+ 1 5750 3550
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R5
+U 1 1 5F42FDD5
+P 5750 3800
+F 0 "R5" V 5543 3800 50 0000 C CNN
+F 1 "64" V 5634 3800 50 0000 C CNN
+F 2 "" V 5680 3800 50 0001 C CNN
+F 3 "~" H 5750 3800 50 0001 C CNN
+ 1 5750 3800
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 5500 3800 5600 3800
+Wire Wire Line
+ 5450 3550 5500 3550
+Wire Wire Line
+ 5500 3550 5500 3800
+Connection ~ 5500 3550
+Wire Wire Line
+ 5500 3550 5550 3550
+Wire Wire Line
+ 5400 3800 5500 3800
+Connection ~ 5500 3800
+$Comp
+L Switch:SW_SPST SW11
+U 1 1 5F42FDE6
+P 6250 3550
+F 0 "SW11" H 6250 3785 50 0000 C CNN
+F 1 "SW_SPST" H 6250 3694 50 0000 C CNN
+F 2 "" H 6250 3550 50 0001 C CNN
+F 3 "~" H 6250 3550 50 0001 C CNN
+ 1 6250 3550
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R7
+U 1 1 5F42FDF0
+P 6250 3800
+F 0 "R7" V 6043 3800 50 0000 C CNN
+F 1 "32" V 6134 3800 50 0000 C CNN
+F 2 "" V 6180 3800 50 0001 C CNN
+F 3 "~" H 6250 3800 50 0001 C CNN
+ 1 6250 3800
+ 0 1 1 0
+$EndComp
+$Comp
+L Switch:SW_SPST SW14
+U 1 1 5F42FDFA
+P 6750 3550
+F 0 "SW14" H 6750 3785 50 0000 C CNN
+F 1 "SW_SPST" H 6750 3694 50 0000 C CNN
+F 2 "" H 6750 3550 50 0001 C CNN
+F 3 "~" H 6750 3550 50 0001 C CNN
+ 1 6750 3550
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R10
+U 1 1 5F42FE04
+P 6750 3800
+F 0 "R10" V 6543 3800 50 0000 C CNN
+F 1 "16" V 6634 3800 50 0000 C CNN
+F 2 "" V 6680 3800 50 0001 C CNN
+F 3 "~" H 6750 3800 50 0001 C CNN
+ 1 6750 3800
+ 0 1 1 0
+$EndComp
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 6500 3550
+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 6500 3800
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 6000 3550
+Wire Wire Line
+ 6000 3550 6050 3550
+Connection ~ 6000 3800
+Wire Wire Line
+ 6000 3800 6100 3800
+$Comp
+L Switch:SW_SPST SW1
+U 1 1 5F4459DA
+P 4750 2750
+F 0 "SW1" H 4750 2985 50 0000 C CNN
+F 1 "SW_SPST" H 4750 2894 50 0000 C CNN
+F 2 "" H 4750 2750 50 0001 C CNN
+F 3 "~" H 4750 2750 50 0001 C CNN
+ 1 4750 2750
+ 1 0 0 -1
+$EndComp
+$Comp
+L Switch:SW_SPST SW4
+U 1 1 5F4459F0
+P 5250 2750
+F 0 "SW4" H 5250 2985 50 0000 C CNN
+F 1 "SW_SPST" H 5250 2894 50 0000 C CNN
+F 2 "" H 5250 2750 50 0001 C CNN
+F 3 "~" H 5250 2750 50 0001 C CNN
+ 1 5250 2750
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 4950 2750 5000 2750
+Wire Wire Line
+ 5000 2750 5000 3000
+Connection ~ 5000 2750
+Wire Wire Line
+ 5000 2750 5050 2750
+$Comp
+L Switch:SW_SPST SW7
+U 1 1 5F445A0B
+P 5750 2750
+F 0 "SW7" H 5750 2985 50 0000 C CNN
+F 1 "SW_SPST" H 5750 2894 50 0000 C CNN
+F 2 "" H 5750 2750 50 0001 C CNN
+F 3 "~" H 5750 2750 50 0001 C CNN
+ 1 5750 2750
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 5450 2750 5500 2750
+Wire Wire Line
+ 5500 2750 5500 3000
+Connection ~ 5500 2750
+Wire Wire Line
+ 5500 2750 5550 2750
+$Comp
+L Switch:SW_SPST SW10
+U 1 1 5F445A26
+P 6250 2750
+F 0 "SW10" H 6250 2985 50 0000 C CNN
+F 1 "SW_SPST" H 6250 2894 50 0000 C CNN
+F 2 "" H 6250 2750 50 0001 C CNN
+F 3 "~" H 6250 2750 50 0001 C CNN
+ 1 6250 2750
+ 1 0 0 -1
+$EndComp
+$Comp
+L Switch:SW_SPST SW13
+U 1 1 5F445A3A
+P 6750 2750
+F 0 "SW13" H 6750 2985 50 0000 C CNN
+F 1 "SW_SPST" H 6750 2894 50 0000 C CNN
+F 2 "" H 6750 2750 50 0001 C CNN
+F 3 "~" H 6750 2750 50 0001 C CNN
+ 1 6750 2750
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R9
+U 1 1 5F445A44
+P 6750 3000
+F 0 "R9" V 6543 3000 50 0000 C CNN
+F 1 "512" V 6634 3000 50 0000 C CNN
+F 2 "" V 6680 3000 50 0001 C CNN
+F 3 "~" H 6750 3000 50 0001 C CNN
+ 1 6750 3000
+ 0 1 1 0
+$EndComp
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
+ 6500 2750 6500 3000
+Connection ~ 6500 2750
+Wire Wire Line
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+Wire Wire Line
+ 6950 2750 7000 2750
+Wire Wire Line
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+Wire Wire Line
+ 6900 3000 7000 3000
+Wire Wire Line
+ 5950 2750 6000 2750
+Wire Wire Line
+ 6000 2750 6000 3000
+Connection ~ 6000 2750
+Wire Wire Line
+ 6000 2750 6050 2750
+$Comp
+L Device:Lamp LA4
+U 1 1 5F459AA3
+P 6250 3000
+F 0 "LA4" V 5985 3000 50 0000 C CNN
+F 1 "Lamp" V 6076 3000 50 0000 C CNN
+F 2 "" V 6250 3100 50 0001 C CNN
+F 3 "~" V 6250 3100 50 0001 C CNN
+ 1 6250 3000
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 6450 3000 6500 3000
+Connection ~ 6500 3000
+Wire Wire Line
+ 6050 3000 6000 3000
+$Comp
+L Device:Lamp LA3
+U 1 1 5F48104F
+P 5750 3000
+F 0 "LA3" V 5485 3000 50 0000 C CNN
+F 1 "Lamp" V 5576 3000 50 0000 C CNN
+F 2 "" V 5750 3100 50 0001 C CNN
+F 3 "~" V 5750 3100 50 0001 C CNN
+ 1 5750 3000
+ 0 1 1 0
+$EndComp
+$Comp
+L Device:Lamp LA2
+U 1 1 5F4819AC
+P 5250 3000
+F 0 "LA2" V 4985 3000 50 0000 C CNN
+F 1 "Lamp" V 5076 3000 50 0000 C CNN
+F 2 "" V 5250 3100 50 0001 C CNN
+F 3 "~" V 5250 3100 50 0001 C CNN
+ 1 5250 3000
+ 0 1 1 0
+$EndComp
+$Comp
+L Device:Lamp LA1
+U 1 1 5F482195
+P 4750 3000
+F 0 "LA1" V 4485 3000 50 0000 C CNN
+F 1 "Lamp" V 4576 3000 50 0000 C CNN
+F 2 "" V 4750 3100 50 0001 C CNN
+F 3 "~" V 4750 3100 50 0001 C CNN
+ 1 4750 3000
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 4950 3000 5000 3000
+Wire Wire Line
+ 5000 3000 5050 3000
+Connection ~ 5000 3000
+Wire Wire Line
+ 5450 3000 5500 3000
+Wire Wire Line
+ 5500 3000 5550 3000
+Connection ~ 5500 3000
+Wire Wire Line
+ 5950 3000 6000 3000
+Connection ~ 6000 3000
+Wire Wire Line
+ 4550 4400 4550 4000
+Wire Wire Line
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+Wire Wire Line
+ 7000 4000 7000 3800
+Connection ~ 4550 4400
+Connection ~ 7000 3800
+Wire Wire Line
+ 4550 3550 4550 3200
+Wire Wire Line
+ 4550 3200 7000 3200
+Wire Wire Line
+ 7000 3200 7000 3000
+Connection ~ 4550 3550
+Connection ~ 7000 3000
+Wire Wire Line
+ 4550 3100 4550 3000
+Wire Wire Line
+ 4550 3000 4550 2750
+Wire Wire Line
+ 7000 4900 7000 4650
+Connection ~ 7000 4650
+Connection ~ 4550 3000
+Wire Wire Line
+ 7000 4900 4050 4900
+Wire Wire Line
+ 4050 4900 4050 3400
+$EndSCHEMATC
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 1
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L Connector:USB_A J1
+U 1 1 5F4101A8
+P 3850 3350
+F 0 "J1" H 3907 3817 50 0000 C CNN
+F 1 "USB_A" H 3907 3726 50 0000 C CNN
+F 2 "" H 4000 3300 50 0001 C CNN
+F 3 " ~" H 4000 3300 50 0001 C CNN
+ 1 3850 3350
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 4150 3450 4250 3450
+Wire Wire Line
+ 4250 3350 4150 3350
+$Comp
+L Switch:SW_SPST SW3
+U 1 1 5F410F20
+P 4750 4400
+F 0 "SW3" H 4750 4635 50 0000 C CNN
+F 1 "SW_SPST" H 4750 4544 50 0000 C CNN
+F 2 "" H 4750 4400 50 0001 C CNN
+F 3 "~" H 4750 4400 50 0001 C CNN
+ 1 4750 4400
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R2
+U 1 1 5F411557
+P 4750 4650
+F 0 "R2" V 4543 4650 50 0000 C CNN
+F 1 "8" V 4634 4650 50 0000 C CNN
+F 2 "" V 4680 4650 50 0001 C CNN
+F 3 "~" H 4750 4650 50 0001 C CNN
+ 1 4750 4650
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 4550 4400 4550 4650
+Wire Wire Line
+ 4550 4650 4600 4650
+$Comp
+L Switch:SW_SPST SW6
+U 1 1 5F4130F6
+P 5250 4400
+F 0 "SW6" H 5250 4635 50 0000 C CNN
+F 1 "SW_SPST" H 5250 4544 50 0000 C CNN
+F 2 "" H 5250 4400 50 0001 C CNN
+F 3 "~" H 5250 4400 50 0001 C CNN
+ 1 5250 4400
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R4
+U 1 1 5F413100
+P 5250 4650
+F 0 "R4" V 5043 4650 50 0000 C CNN
+F 1 "4" V 5134 4650 50 0000 C CNN
+F 2 "" V 5180 4650 50 0001 C CNN
+F 3 "~" H 5250 4650 50 0001 C CNN
+ 1 5250 4650
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 5000 4650 5100 4650
+Wire Wire Line
+ 4950 4400 5000 4400
+Wire Wire Line
+ 5000 4400 5000 4650
+Connection ~ 5000 4400
+Wire Wire Line
+ 5000 4400 5050 4400
+Wire Wire Line
+ 4900 4650 5000 4650
+Connection ~ 5000 4650
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--- /dev/null
+<!doctype html>
+<html lang="en">
+<head>
+<title>Adjustable resistor / indicator</title>
+<!-- 2020-08-22 L 15:39 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="generator" content="Org-mode">
+<meta name="author" content="Svjatoslav Agejenko">
+<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
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+<body>
+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">Adjustable resistor / indicator</h1>
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.
+</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.
+</li>
+
+<li>Author:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+<ul class="org-ul">
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
+</li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a>
+</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+I needed a way to experimentally find resistance that works best in
+certain circuits. Usual potentiometers could not handle required power
+dissipation and were not precise enough.
+</p>
+
+<p>
+Solution is to build adjustable resistor:
+</p>
+
+
+<figure>
+<p><img src="make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+
+<p>
+Logically there is series of resistors that increase in resistance in
+the power of 2: 0.5, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512. Each
+resistor can be enabled or disabled by a switch. This makes entire
+range of 0 – 1023.5 ohms available with the 0.5 ohms precision.
+</p>
+
+<p>
+Schematic:
+<img src="schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+
+<p>
+Here is front panel for switches:
+<img src="front%20panel.png" class="img-responsive" alt="front%20panel.png">
+</p>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="front%20panel.FCStd">FreeCAD project</a>
+</li>
+<li><a href="front%20panel.stl">STL file</a>
+</li>
+</ul>
+
+<p>
+Sometimes I would like to use lightbulbs with various parameters as
+test load/indicator. Current device has 4 of them included.
+</p>
+
+<p>
+Here is front panel for light bulbs:
+<img src="indicator%20panel.png" class="img-responsive" alt="indicator%20panel.png">
+</p>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="indicator%20panel.FCStd">FreeCAD project</a>
+</li>
+<li><a href="indicator%20panel.stl">STL file</a>
+</li>
+</ul>
+
+
+<p>
+After assembly using prototype PCB:
+<img src="make,%202.png" class="img-responsive" alt="make,%202.png">
+</p>
+
+
+<p>
+Following body is used as a case and PCB support:
+<img src="body.png" class="img-responsive" alt="body.png">
+</p>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="body%20and%20back%20cover.FCStd">FreeCAD project (body + back cover)</a>
+</li>
+<li><a href="body.stl">STL file for body</a>
+</li>
+</ul>
+
+<p>
+Result:
+<img src="make,%203.png" class="img-responsive" alt="make,%203.png">
+</p>
+
+<p>
+Cover on the back:
+<img src="back%20cover.png" class="img-responsive" alt="back%20cover.png">
+</p>
+
+<p>
+Download: <a href="back%20cover.stl">STL file</a>
+</p>
+
+<p>
+Button covers:
+<img src="button.png" class="img-responsive" alt="button.png">
+</p>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="button.FCStd">FreeCAD project</a>
+</li>
+<li><a href="button.stl">STL file</a>
+</li>
+</ul>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. General</a></li>
+<li><a href="#sec-2">2. Project description</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2020-08-22 L 15:39</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
+</div>
+</footer>
+</body>
+</html>
--- /dev/null
+#+TITLE: Adjustable resistor / indicator
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Author:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+I needed a way to experimentally find resistance that works best in
+certain circuits. Usual potentiometers could not handle required power
+dissipation and were not precise enough.
+
+Solution is to build adjustable resistor:
+
+[[file:make.png]]
+
+Logically there is series of resistors that increase in resistance in
+the power of 2: 0.5, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512. Each
+resistor can be enabled or disabled by a switch. This makes entire
+range of 0 -- 1023.5 ohms available with the 0.5 ohms precision.
+
+Schematic:
+[[file:schematic.png]]
+
+Here is front panel for switches:
+[[file:front%20panel.png]]
+
+Download:
++ [[file:front%20panel.FCStd][FreeCAD project]]
++ [[file:front%20panel.stl][STL file]]
+
+Sometimes I would like to use lightbulbs with various parameters as
+test load/indicator. Current device has 4 of them included.
+
+Here is front panel for light bulbs:
+[[file:indicator%20panel.png]]
+
+Download:
++ [[file:indicator%20panel.FCStd][FreeCAD project]]
++ [[file:indicator%20panel.stl][STL file]]
+
+
+After assembly using prototype PCB:
+[[file:make,%202.png]]
+
+
+Following body is used as a case and PCB support:
+[[file:body.png]]
+
+Download:
++ [[file:body%20and%20back%20cover.FCStd][FreeCAD project (body + back cover)]]
++ [[file:body.stl][STL file for body]]
+
+Result:
+[[file:make,%203.png]]
+
+Cover on the back:
+[[file:back%20cover.png]]
+
+Download: [[file:back%20cover.stl][STL file]]
+
+Button covers:
+[[file:button.png]]
+
+Download:
++ [[file:button.FCStd][FreeCAD project]]
++ [[file:button.stl][STL file]]
--- /dev/null
+<!doctype html>
+<html lang="en">
+<head>
+<title>Alternative (and incompatible) layout for USB connectors</title>
+<!-- 2021-01-03 P 00:30 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="generator" content="Org-mode">
+<meta name="author" content="Svjatoslav Agejenko">
+<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+<style type="text/css">
+footer {background-color: #111 !important;}
+pre {background-color: #111; color: #ccc;}
+</style>
+<style type="text/css">
+/* org mode styles on top of twbs */
+
+html {
+ position: relative;
+ min-height: 100%;
+}
+
+body {
+ font-size: 18px;
+ margin-bottom: 105px;
+}
+
+footer {
+ position: absolute;
+ bottom: 0;
+ width: 100%;
+ height: 101px;
+ background-color: #f5f5f5;
+}
+
+footer > div {
+ padding: 10px;
+}
+
+footer p {
+ margin: 0 0 5px;
+ text-align: center;
+ font-size: 16px;
+}
+
+#table-of-contents {
+ margin-top: 20px;
+ margin-bottom: 20px;
+}
+
+blockquote p {
+ font-size: 18px;
+}
+
+pre {
+ font-size: 16px;
+}
+
+.footpara {
+ display: inline-block;
+}
+
+figcaption {
+ font-size: 16px;
+ color: #666;
+ font-style: italic;
+ padding-bottom: 15px;
+}
+
+/* from twbs docs */
+
+.bs-docs-sidebar.affix {
+ position: static;
+}
+@media (min-width: 768px) {
+ .bs-docs-sidebar {
+ padding-left: 20px;
+ }
+}
+
+/* All levels of nav */
+.bs-docs-sidebar .nav > li > a {
+ display: block;
+ padding: 4px 20px;
+ font-size: 14px;
+ font-weight: 500;
+ color: #999;
+}
+.bs-docs-sidebar .nav > li > a:hover,
+.bs-docs-sidebar .nav > li > a:focus {
+ padding-left: 19px;
+ color: #A1283B;
+ text-decoration: none;
+ background-color: transparent;
+ border-left: 1px solid #A1283B;
+}
+.bs-docs-sidebar .nav > .active > a,
+.bs-docs-sidebar .nav > .active:hover > a,
+.bs-docs-sidebar .nav > .active:focus > a {
+ padding-left: 18px;
+ font-weight: bold;
+ color: #A1283B;
+ background-color: transparent;
+ border-left: 2px solid #A1283B;
+}
+
+/* Nav: second level (shown on .active) */
+.bs-docs-sidebar .nav .nav {
+ display: none; /* Hide by default, but at >768px, show it */
+ padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 30px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav > li > a:focus {
+ padding-left: 29px;
+}
+.bs-docs-sidebar .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav > .active:focus > a {
+ padding-left: 28px;
+ font-weight: 500;
+}
+
+/* Nav: third level (shown on .active) */
+.bs-docs-sidebar .nav .nav .nav {
+ padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 40px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav .nav > li > a:focus {
+ padding-left: 39px;
+}
+.bs-docs-sidebar .nav .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
+ padding-left: 38px;
+ font-weight: 500;
+}
+
+/* Show and affix the side nav when space allows it */
+@media (min-width: 992px) {
+ .bs-docs-sidebar .nav > .active > ul {
+ display: block;
+ }
+ /* Widen the fixed sidebar */
+ .bs-docs-sidebar.affix,
+ .bs-docs-sidebar.affix-bottom {
+ width: 213px;
+ }
+ .bs-docs-sidebar.affix {
+ position: fixed; /* Undo the static from mobile first approach */
+ top: 20px;
+ }
+ .bs-docs-sidebar.affix-bottom {
+ position: absolute; /* Undo the static from mobile first approach */
+ }
+ .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
+ margin-top: 0;
+ margin-bottom: 0
+ }
+}
+@media (min-width: 1200px) {
+ /* Widen the fixed sidebar again */
+ .bs-docs-sidebar.affix-bottom,
+ .bs-docs-sidebar.affix {
+ width: 263px;
+ }
+}
+</style>
+<script type="text/javascript">
+$(function() {
+ 'use strict';
+
+ $('.bs-docs-sidebar li').first().addClass('active');
+
+ $(document.body).scrollspy({target: '.bs-docs-sidebar'});
+
+ $('.bs-docs-sidebar').affix();
+});
+</script>
+</head>
+<body>
+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">Alternative (and incompatible) layout for USB connectors</h1>
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.
+</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.
+</li>
+
+<li>Authors:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+<ul class="org-ul">
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
+</li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+
+<li>Valeria Agejenko
+</li>
+</ul>
+</li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a>
+</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+<b>Warning!</b> Here I describe a hack that I personally found useful for
+my own needs. But it is dangerous. Not to be replicated unless you
+know that you are doing.
+</p>
+
+
+
+<figure>
+<p><img src="make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+
+<p>
+I needed a way to power various devices I build.
+</p>
+
+<p>
+Requirements:
+</p>
+
+<ul class="org-ul">
+<li>Reliable.
+</li>
+<li>Cheap.
+</li>
+<li>Easy to use.
+</li>
+<li>Popular and highly available.
+</li>
+<li>Ability to draw significant current directly from 12V cheap, popular
+and powerful lead-acid battery (optionally off-grid). Useful for
+powerful electric motors, heaters, soldering irons, radio
+transmitters, etc.
+</li>
+<li>Ability to draw limited but stabilized 5V power. Good for digital
+circuits.
+</li>
+<li>Ability to have limited and simple 1-wire digital communication.
+</li>
+</ul>
+
+<p>
+USB Type A connectors are best match that I found.
+</p>
+
+<p>
+The main problem is, I like USB connectors but I want to use different
+and incompatible electrical layout with them.
+</p>
+
+<p>
+<b>Connecting proper USB power supplies, devices and even cables to the
+ones that use alternative electrical layout would do damage!!!</b>
+</p>
+
+<p>
+To avoid accidental mismatches, I mark all connectors/cables and devices that
+use alternative wiring with <a href="stickers.png">printed, laminated warning stickers</a>.
+</p>
+
+<p>
+Alternative wiring schematic:
+<img src="schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+
+<ul class="org-ul">
+<li>Outer shell is ground.
+</li>
+<li>2 central pins are re-purposed to deliver +12V and high power.
+</li>
+<li>1 pin is for limited power +5V.
+</li>
+<li>1 pin for 1-Wire data.
+</li>
+</ul>
+
+
+<p>
+Example warning marking on device to indicate that alternative USB
+layout is used here:
+</p>
+
+
+<figure>
+<p><img src="../lab%20heater%20and%20cooler/make,%202.png" class="img-responsive" alt="make,%202.png">
+</p>
+</figure>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. General</a></li>
+<li><a href="#sec-2">2. Project description</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2021-01-03 P 00:30</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
+</div>
+</footer>
+</body>
+</html>
--- /dev/null
+#+TITLE: Alternative (and incompatible) layout for USB connectors
+#+author: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Authors:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
+ - Valeria Agejenko
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+
+*Warning!* Here I describe a hack that I personally found useful for
+my own needs. But it is dangerous. Not to be replicated unless you
+know that you are doing.
+
+
+[[file:make.png]]
+
+I needed a way to power various devices I build.
+
+Requirements:
+
+- Reliable.
+- Cheap.
+- Easy to use.
+- Popular and highly available.
+- Ability to draw significant current directly from 12V cheap, popular
+ and powerful lead-acid battery (optionally off-grid). Useful for
+ powerful electric motors, heaters, soldering irons, radio
+ transmitters, etc.
+- Ability to draw limited but stabilized 5V power. Good for digital
+ circuits.
+- Ability to have limited and simple 1-wire digital communication.
+
+USB Type A connectors are best match that I found.
+
+The main problem is, I like USB connectors but I want to use different
+and incompatible electrical layout with them.
+
+*Connecting proper USB power supplies, devices and even cables to the
+ones that use alternative electrical layout would do damage!!!*
+
+To avoid accidental mismatches, I mark all connectors/cables and devices that
+use alternative wiring with [[file:stickers.png][printed, laminated warning stickers]].
+
+Alternative wiring schematic:
+[[file:schematic.png]]
+
+- Outer shell is ground.
+- 2 central pins are re-purposed to deliver +12V and high power.
+- 1 pin is for limited power +5V.
+- 1 pin for 1-Wire data.
+
+
+Example warning marking on device to indicate that alternative USB
+layout is used here:
+
+[[file:../lab%20heater%20and%20cooler/make,%202.png]]
--- /dev/null
+<!doctype html>
+<html lang="en">
+<head>
+<title>AA and AAA battery tester</title>
+<!-- 2020-05-24 P 23:55 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="generator" content="Org-mode">
+<meta name="author" content="Svjatoslav Agejenko">
+<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+<style type="text/css">
+footer {background-color: #111 !important;}
+pre {background-color: #111; color: #ccc;}
+</style>
+<style type="text/css">
+/* org mode styles on top of twbs */
+
+html {
+ position: relative;
+ min-height: 100%;
+}
+
+body {
+ font-size: 18px;
+ margin-bottom: 105px;
+}
+
+footer {
+ position: absolute;
+ bottom: 0;
+ width: 100%;
+ height: 101px;
+ background-color: #f5f5f5;
+}
+
+footer > div {
+ padding: 10px;
+}
+
+footer p {
+ margin: 0 0 5px;
+ text-align: center;
+ font-size: 16px;
+}
+
+#table-of-contents {
+ margin-top: 20px;
+ margin-bottom: 20px;
+}
+
+blockquote p {
+ font-size: 18px;
+}
+
+pre {
+ font-size: 16px;
+}
+
+.footpara {
+ display: inline-block;
+}
+
+figcaption {
+ font-size: 16px;
+ color: #666;
+ font-style: italic;
+ padding-bottom: 15px;
+}
+
+/* from twbs docs */
+
+.bs-docs-sidebar.affix {
+ position: static;
+}
+@media (min-width: 768px) {
+ .bs-docs-sidebar {
+ padding-left: 20px;
+ }
+}
+
+/* All levels of nav */
+.bs-docs-sidebar .nav > li > a {
+ display: block;
+ padding: 4px 20px;
+ font-size: 14px;
+ font-weight: 500;
+ color: #999;
+}
+.bs-docs-sidebar .nav > li > a:hover,
+.bs-docs-sidebar .nav > li > a:focus {
+ padding-left: 19px;
+ color: #A1283B;
+ text-decoration: none;
+ background-color: transparent;
+ border-left: 1px solid #A1283B;
+}
+.bs-docs-sidebar .nav > .active > a,
+.bs-docs-sidebar .nav > .active:hover > a,
+.bs-docs-sidebar .nav > .active:focus > a {
+ padding-left: 18px;
+ font-weight: bold;
+ color: #A1283B;
+ background-color: transparent;
+ border-left: 2px solid #A1283B;
+}
+
+/* Nav: second level (shown on .active) */
+.bs-docs-sidebar .nav .nav {
+ display: none; /* Hide by default, but at >768px, show it */
+ padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 30px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav > li > a:focus {
+ padding-left: 29px;
+}
+.bs-docs-sidebar .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav > .active:focus > a {
+ padding-left: 28px;
+ font-weight: 500;
+}
+
+/* Nav: third level (shown on .active) */
+.bs-docs-sidebar .nav .nav .nav {
+ padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 40px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav .nav > li > a:focus {
+ padding-left: 39px;
+}
+.bs-docs-sidebar .nav .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
+ padding-left: 38px;
+ font-weight: 500;
+}
+
+/* Show and affix the side nav when space allows it */
+@media (min-width: 992px) {
+ .bs-docs-sidebar .nav > .active > ul {
+ display: block;
+ }
+ /* Widen the fixed sidebar */
+ .bs-docs-sidebar.affix,
+ .bs-docs-sidebar.affix-bottom {
+ width: 213px;
+ }
+ .bs-docs-sidebar.affix {
+ position: fixed; /* Undo the static from mobile first approach */
+ top: 20px;
+ }
+ .bs-docs-sidebar.affix-bottom {
+ position: absolute; /* Undo the static from mobile first approach */
+ }
+ .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
+ margin-top: 0;
+ margin-bottom: 0
+ }
+}
+@media (min-width: 1200px) {
+ /* Widen the fixed sidebar again */
+ .bs-docs-sidebar.affix-bottom,
+ .bs-docs-sidebar.affix {
+ width: 263px;
+ }
+}
+</style>
+<script type="text/javascript">
+$(function() {
+ 'use strict';
+
+ $('.bs-docs-sidebar li').first().addClass('active');
+
+ $(document.body).scrollspy({target: '.bs-docs-sidebar'});
+
+ $('.bs-docs-sidebar').affix();
+});
+</script>
+</head>
+<body>
+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">AA and AAA battery tester</h1>
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.
+</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.
+</li>
+
+<li>Author:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+</li>
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
+</li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a>
+</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+
+<figure>
+<p><img src="make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+
+
+<figure>
+<p><img src="make,%202.png" class="img-responsive" alt="make,%202.png">
+</p>
+</figure>
+
+<p>
+Simple rechargeable Ni-MH battery tester. The problem with those
+batteries is: right after you take them out of charger, voltage level
+at their terminals is good. But some old batteries will get
+empty/discharged way too quickly under normal load. This device is
+intended to discover old batteries with reduced capacity.
+</p>
+
+<p>
+Freshly charged batteries are tested under high load for short time by
+shorting battery + and - terminals using 5 ohm power resistor
+(R1). Simultaneously battery voltage is being measured while under
+load.
+</p>
+
+
+<figure>
+<p><img src="electrical%20schematic.png" class="img-responsive" alt="electrical%20schematic.png">
+</p>
+</figure>
+
+<p>
+I use vintage analog voltmeter. Instead of power resistor I use
+Nichrome resistance wire. Test/measurement button should not be
+pressed for long because power resistor gets hot quickly and battery
+is being quickly depleted during measurement.
+</p>
+
+
+<figure>
+<p><img src="assembly.png" class="img-responsive" alt="assembly.png">
+</p>
+</figure>
+
+<ul class="org-ul">
+<li>Body: <img src="body.png" class="img-responsive" alt="body.png">
+</li>
+<li>Cover: <img src="cover.png" class="img-responsive" alt="cover.png">
+</li>
+
+<li>Download:
+<ul class="org-ul">
+<li><a href="bodyAndCover.FCStd">FreeCAD project</a>
+</li>
+<li><a href="body.stl">body STL file</a>
+</li>
+<li><a href="cover.stl">cover STL file</a>
+</li>
+</ul>
+</li>
+
+<li>PS: While this device is interesting to build, still you can just
+use ordinary ammeter that can handle battery generated current.
+</li>
+</ul>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. General</a></li>
+<li><a href="#sec-2">2. Project description</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2020-05-24 P 23:55</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
+</div>
+</footer>
+</body>
+</html>
--- /dev/null
+#+TITLE: AA and AAA battery tester
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Author:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+[[file:make.png]]
+
+[[file:make,%202.png]]
+
+Simple rechargeable Ni-MH battery tester. The problem with those
+batteries is: right after you take them out of charger, voltage level
+at their terminals is good. But some old batteries will get
+empty/discharged way too quickly under normal load. This device is
+intended to discover old batteries with reduced capacity.
+
+Freshly charged batteries are tested under high load for short time by
+shorting battery + and - terminals using 5 ohm power resistor
+(R1). Simultaneously battery voltage is being measured while under
+load.
+
+[[file:electrical%20schematic.png]]
+
+I use vintage analog voltmeter. Instead of power resistor I use
+Nichrome resistance wire. Test/measurement button should not be
+pressed for long because power resistor gets hot quickly and battery
+is being quickly depleted during measurement.
+
+[[file:assembly.png]]
+
++ Body: [[file:body.png]]
++ Cover: [[file:cover.png]]
+
++ Download:
+ + [[file:bodyAndCover.FCStd][FreeCAD project]]
+ + [[file:body.stl][body STL file]]
+ + [[file:cover.stl][cover STL file]]
+
++ PS: While this device is interesting to build, still you can just
+ use ordinary ammeter that can handle battery generated current.
--- /dev/null
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Device_Battery
+#
+DEF Device_Battery BT 0 0 N N 1 F N
+F0 "BT" 100 100 50 H V L CNN
+F1 "Device_Battery" 100 0 50 H V L CNN
+F2 "" 0 60 50 V I C CNN
+F3 "" 0 60 50 V I C CNN
+DRAW
+S -80 -55 80 -65 0 1 0 F
+S -80 70 80 60 0 1 0 F
+S -52 -78 50 -98 0 1 0 F
+S -52 47 50 27 0 1 0 F
+P 2 0 1 0 0 -60 0 -50 N
+P 2 0 1 0 0 -40 0 -30 N
+P 2 0 1 0 0 -20 0 -10 N
+P 2 0 1 0 0 0 0 10 N
+P 2 0 1 0 0 20 0 30 N
+P 2 0 1 0 0 70 0 100 N
+P 2 0 1 10 10 105 50 105 N
+P 2 0 1 10 30 125 30 85 N
+X + 1 0 200 100 D 50 50 1 1 P
+X - 2 0 -200 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_R
+#
+DEF Device_R R 0 0 N Y 1 F N
+F0 "R" 80 0 50 V V C CNN
+F1 "Device_R" 0 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ R_*
+$ENDFPLIST
+DRAW
+S -40 -100 40 100 0 1 10 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_R_POT
+#
+DEF Device_R_POT RV 0 40 Y N 1 F N
+F0 "RV" -175 0 50 V V C CNN
+F1 "Device_R_POT" -100 0 50 V V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Potentiometer*
+$ENDFPLIST
+DRAW
+S 40 100 -40 -100 0 1 10 N
+P 2 0 1 0 100 0 60 0 N
+P 4 0 1 0 45 0 90 20 90 -20 45 0 F
+X 1 1 0 150 50 D 50 50 1 1 P
+X 2 2 150 0 50 L 50 50 1 1 P
+X 3 3 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Voltmeter_DC
+#
+DEF Device_Voltmeter_DC MES 0 1 N N 1 F N
+F0 "MES" -130 40 50 H V R CNN
+F1 "Device_Voltmeter_DC" -130 -30 50 H V R CNN
+F2 "" 0 100 50 V I C CNN
+F3 "" 0 100 50 V I C CNN
+DRAW
+C 0 0 100 0 1 10 N
+T 0 0 0 100 0 0 0 V Normal 0 C C
+P 2 0 0 0 -125 -125 -75 -75 N
+P 2 0 0 0 75 75 125 125 N
+P 3 0 0 0 75 125 125 125 125 75 N
+P 2 0 1 0 10 150 30 150 N
+P 2 0 1 0 20 160 20 140 N
+X - 1 0 -200 100 U 50 50 1 1 P
+X + 2 0 200 100 D 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Switch_SW_SPST
+#
+DEF Switch_SW_SPST SW 0 0 Y N 1 F N
+F0 "SW" 0 125 50 H V C CNN
+F1 "Switch_SW_SPST" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+C -80 0 20 0 0 0 N
+C 80 0 20 0 0 0 N
+P 2 0 0 0 -60 10 60 70 N
+X A 1 -200 0 100 R 50 50 1 1 P
+X B 2 200 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+#End Library
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 1
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L Device:Battery BT1
+U 1 1 5EC97EC8
+P 2600 3750
+F 0 "BT1" H 2708 3796 50 0000 L CNN
+F 1 "Battery" H 2708 3705 50 0000 L CNN
+F 2 "" V 2600 3810 50 0001 C CNN
+F 3 "~" V 2600 3810 50 0001 C CNN
+ 1 2600 3750
+ 1 0 0 -1
+$EndComp
+$Comp
+L Switch:SW_SPST SW1
+U 1 1 5EC98542
+P 3100 3250
+F 0 "SW1" H 3100 3485 50 0000 C CNN
+F 1 "SW_SPST" H 3100 3394 50 0000 C CNN
+F 2 "" H 3100 3250 50 0001 C CNN
+F 3 "~" H 3100 3250 50 0001 C CNN
+ 1 3100 3250
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R1
+U 1 1 5EC98B01
+P 3550 3700
+F 0 "R1" H 3620 3746 50 0000 L CNN
+F 1 "5" H 3620 3655 50 0000 L CNN
+F 2 "" V 3480 3700 50 0001 C CNN
+F 3 "~" H 3550 3700 50 0001 C CNN
+ 1 3550 3700
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:R R2
+U 1 1 5EC98F38
+P 3850 3250
+F 0 "R2" V 3643 3250 50 0000 C CNN
+F 1 "3k" V 3734 3250 50 0000 C CNN
+F 2 "" V 3780 3250 50 0001 C CNN
+F 3 "~" H 3850 3250 50 0001 C CNN
+ 1 3850 3250
+ 0 1 1 0
+$EndComp
+$Comp
+L Device:R_POT RV1
+U 1 1 5EC99ABB
+P 4350 3250
+F 0 "RV1" V 4143 3250 50 0000 C CNN
+F 1 "3k3" V 4234 3250 50 0000 C CNN
+F 2 "" H 4350 3250 50 0001 C CNN
+F 3 "~" H 4350 3250 50 0001 C CNN
+ 1 4350 3250
+ 0 1 1 0
+$EndComp
+$Comp
+L Device:Voltmeter_DC MES1
+U 1 1 5EC9A7E7
+P 4350 3750
+F 0 "MES1" H 4503 3796 50 0000 L CNN
+F 1 "Voltmeter_DC" H 4503 3705 50 0000 L CNN
+F 2 "" V 4350 3850 50 0001 C CNN
+F 3 "~" V 4350 3850 50 0001 C CNN
+ 1 4350 3750
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 2600 3550 2600 3250
+Wire Wire Line
+ 2600 3250 2900 3250
+Wire Wire Line
+ 3300 3250 3550 3250
+Wire Wire Line
+ 4000 3250 4200 3250
+Wire Wire Line
+ 4350 3400 4350 3550
+Wire Wire Line
+ 4350 3950 4350 4100
+Wire Wire Line
+ 4350 4100 3550 4100
+Wire Wire Line
+ 3550 4100 3550 3850
+Wire Wire Line
+ 2600 3950 2600 4100
+Wire Wire Line
+ 2600 4100 3550 4100
+Connection ~ 3550 4100
+Wire Wire Line
+ 3550 3550 3550 3250
+Connection ~ 3550 3250
+Wire Wire Line
+ 3550 3250 3700 3250
+$EndSCHEMATC
--- /dev/null
+<!doctype html>
+<html lang="en">
+<head>
+<title>Cable organizer</title>
+<!-- 2020-03-21 Sat 00:37 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="generator" content="Org-mode">
+<meta name="author" content="Svjatoslav Agejenko">
+<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+<style type="text/css">
+footer {background-color: #111 !important;}
+pre {background-color: #111; color: #ccc;}
+</style>
+<style type="text/css">
+/* org mode styles on top of twbs */
+
+html {
+ position: relative;
+ min-height: 100%;
+}
+
+body {
+ font-size: 18px;
+ margin-bottom: 105px;
+}
+
+footer {
+ position: absolute;
+ bottom: 0;
+ width: 100%;
+ height: 101px;
+ background-color: #f5f5f5;
+}
+
+footer > div {
+ padding: 10px;
+}
+
+footer p {
+ margin: 0 0 5px;
+ text-align: center;
+ font-size: 16px;
+}
+
+#table-of-contents {
+ margin-top: 20px;
+ margin-bottom: 20px;
+}
+
+blockquote p {
+ font-size: 18px;
+}
+
+pre {
+ font-size: 16px;
+}
+
+.footpara {
+ display: inline-block;
+}
+
+figcaption {
+ font-size: 16px;
+ color: #666;
+ font-style: italic;
+ padding-bottom: 15px;
+}
+
+/* from twbs docs */
+
+.bs-docs-sidebar.affix {
+ position: static;
+}
+@media (min-width: 768px) {
+ .bs-docs-sidebar {
+ padding-left: 20px;
+ }
+}
+
+/* All levels of nav */
+.bs-docs-sidebar .nav > li > a {
+ display: block;
+ padding: 4px 20px;
+ font-size: 14px;
+ font-weight: 500;
+ color: #999;
+}
+.bs-docs-sidebar .nav > li > a:hover,
+.bs-docs-sidebar .nav > li > a:focus {
+ padding-left: 19px;
+ color: #A1283B;
+ text-decoration: none;
+ background-color: transparent;
+ border-left: 1px solid #A1283B;
+}
+.bs-docs-sidebar .nav > .active > a,
+.bs-docs-sidebar .nav > .active:hover > a,
+.bs-docs-sidebar .nav > .active:focus > a {
+ padding-left: 18px;
+ font-weight: bold;
+ color: #A1283B;
+ background-color: transparent;
+ border-left: 2px solid #A1283B;
+}
+
+/* Nav: second level (shown on .active) */
+.bs-docs-sidebar .nav .nav {
+ display: none; /* Hide by default, but at >768px, show it */
+ padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 30px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav > li > a:focus {
+ padding-left: 29px;
+}
+.bs-docs-sidebar .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav > .active:focus > a {
+ padding-left: 28px;
+ font-weight: 500;
+}
+
+/* Nav: third level (shown on .active) */
+.bs-docs-sidebar .nav .nav .nav {
+ padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 40px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav .nav > li > a:focus {
+ padding-left: 39px;
+}
+.bs-docs-sidebar .nav .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
+ padding-left: 38px;
+ font-weight: 500;
+}
+
+/* Show and affix the side nav when space allows it */
+@media (min-width: 992px) {
+ .bs-docs-sidebar .nav > .active > ul {
+ display: block;
+ }
+ /* Widen the fixed sidebar */
+ .bs-docs-sidebar.affix,
+ .bs-docs-sidebar.affix-bottom {
+ width: 213px;
+ }
+ .bs-docs-sidebar.affix {
+ position: fixed; /* Undo the static from mobile first approach */
+ top: 20px;
+ }
+ .bs-docs-sidebar.affix-bottom {
+ position: absolute; /* Undo the static from mobile first approach */
+ }
+ .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
+ margin-top: 0;
+ margin-bottom: 0
+ }
+}
+@media (min-width: 1200px) {
+ /* Widen the fixed sidebar again */
+ .bs-docs-sidebar.affix-bottom,
+ .bs-docs-sidebar.affix {
+ width: 263px;
+ }
+}
+</style>
+<script type="text/javascript">
+$(function() {
+ 'use strict';
+
+ $('.bs-docs-sidebar li').first().addClass('active');
+
+ $(document.body).scrollspy({target: '.bs-docs-sidebar'});
+
+ $('.bs-docs-sidebar').affix();
+});
+</script>
+</head>
+<body>
+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">Cable organizer</h1>
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.
+</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.
+</li>
+
+<li>Author:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+</li>
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
+</li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a>
+</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+
+<figure>
+<p><img src="make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+
+<p>
+I have lots of wires in my lab, and I need quick access to them. This
+organizer allows to conveniently hang them on the wall. I use double
+sided tape to make it stick.
+</p>
+
+
+<figure>
+<p><img src="body.png" class="img-responsive" alt="body.png">
+</p>
+</figure>
+</div>
+</div>
+
+<div id="outline-container-sec-3" class="outline-2">
+<h2 id="sec-3"><span class="section-number-2">3</span> Files</h2>
+<div class="outline-text-2" id="text-3">
+<p>
+You can <a href="body.FCStd">download FreeCAD project</a> file to tweak design or generated STL
+file ready for 3D printing:
+</p>
+
+<ul class="org-ul">
+<li><a href="body.stl">body.stl</a>
+</li>
+</ul>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. General</a></li>
+<li><a href="#sec-2">2. Project description</a></li>
+<li><a href="#sec-3">3. Files</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2020-03-21 Sat 00:37</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
+</div>
+</footer>
+</body>
+</html>
--- /dev/null
+#+TITLE: Cable organizer
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Author:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+[[file:make.png]]
+
+I have lots of wires in my lab, and I need quick access to them. This
+organizer allows to conveniently hang them on the wall. I use double
+sided tape to make it stick.
+
+[[file:body.png]]
+
+* Files
+You can [[file:body.FCStd][download FreeCAD project]] file to tweak design or generated STL
+file ready for 3D printing:
+
++ [[file:body.stl]]
--- /dev/null
+<!doctype html>
+<html lang="en">
+<head>
+<title>Headphone hub</title>
+<!-- 2020-12-25 Fri 23:48 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="generator" content="Org-mode">
+<meta name="author" content="Svjatoslav Agejenko">
+<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+<style type="text/css">
+footer {background-color: #111 !important;}
+pre {background-color: #111; color: #ccc;}
+</style>
+<style type="text/css">
+/* org mode styles on top of twbs */
+
+html {
+ position: relative;
+ min-height: 100%;
+}
+
+body {
+ font-size: 18px;
+ margin-bottom: 105px;
+}
+
+footer {
+ position: absolute;
+ bottom: 0;
+ width: 100%;
+ height: 101px;
+ background-color: #f5f5f5;
+}
+
+footer > div {
+ padding: 10px;
+}
+
+footer p {
+ margin: 0 0 5px;
+ text-align: center;
+ font-size: 16px;
+}
+
+#table-of-contents {
+ margin-top: 20px;
+ margin-bottom: 20px;
+}
+
+blockquote p {
+ font-size: 18px;
+}
+
+pre {
+ font-size: 16px;
+}
+
+.footpara {
+ display: inline-block;
+}
+
+figcaption {
+ font-size: 16px;
+ color: #666;
+ font-style: italic;
+ padding-bottom: 15px;
+}
+
+/* from twbs docs */
+
+.bs-docs-sidebar.affix {
+ position: static;
+}
+@media (min-width: 768px) {
+ .bs-docs-sidebar {
+ padding-left: 20px;
+ }
+}
+
+/* All levels of nav */
+.bs-docs-sidebar .nav > li > a {
+ display: block;
+ padding: 4px 20px;
+ font-size: 14px;
+ font-weight: 500;
+ color: #999;
+}
+.bs-docs-sidebar .nav > li > a:hover,
+.bs-docs-sidebar .nav > li > a:focus {
+ padding-left: 19px;
+ color: #A1283B;
+ text-decoration: none;
+ background-color: transparent;
+ border-left: 1px solid #A1283B;
+}
+.bs-docs-sidebar .nav > .active > a,
+.bs-docs-sidebar .nav > .active:hover > a,
+.bs-docs-sidebar .nav > .active:focus > a {
+ padding-left: 18px;
+ font-weight: bold;
+ color: #A1283B;
+ background-color: transparent;
+ border-left: 2px solid #A1283B;
+}
+
+/* Nav: second level (shown on .active) */
+.bs-docs-sidebar .nav .nav {
+ display: none; /* Hide by default, but at >768px, show it */
+ padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 30px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav > li > a:focus {
+ padding-left: 29px;
+}
+.bs-docs-sidebar .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav > .active:focus > a {
+ padding-left: 28px;
+ font-weight: 500;
+}
+
+/* Nav: third level (shown on .active) */
+.bs-docs-sidebar .nav .nav .nav {
+ padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 40px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav .nav > li > a:focus {
+ padding-left: 39px;
+}
+.bs-docs-sidebar .nav .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
+ padding-left: 38px;
+ font-weight: 500;
+}
+
+/* Show and affix the side nav when space allows it */
+@media (min-width: 992px) {
+ .bs-docs-sidebar .nav > .active > ul {
+ display: block;
+ }
+ /* Widen the fixed sidebar */
+ .bs-docs-sidebar.affix,
+ .bs-docs-sidebar.affix-bottom {
+ width: 213px;
+ }
+ .bs-docs-sidebar.affix {
+ position: fixed; /* Undo the static from mobile first approach */
+ top: 20px;
+ }
+ .bs-docs-sidebar.affix-bottom {
+ position: absolute; /* Undo the static from mobile first approach */
+ }
+ .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
+ margin-top: 0;
+ margin-bottom: 0
+ }
+}
+@media (min-width: 1200px) {
+ /* Widen the fixed sidebar again */
+ .bs-docs-sidebar.affix-bottom,
+ .bs-docs-sidebar.affix {
+ width: 263px;
+ }
+}
+</style>
+<script type="text/javascript">
+$(function() {
+ 'use strict';
+
+ $('.bs-docs-sidebar li').first().addClass('active');
+
+ $(document.body).scrollspy({target: '.bs-docs-sidebar'});
+
+ $('.bs-docs-sidebar').affix();
+});
+</script>
+</head>
+<body>
+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">Headphone hub</h1>
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.
+</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.
+</li>
+
+<li>Author:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+</li>
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
+</li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a>
+</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+Simple hub that allows connecting up to 4 devices via headphone
+jack. For example single laptop or mp3 player can power up to 3
+headphones.
+</p>
+
+
+<figure>
+<p><img src="make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+
+<p>
+Schematic diagram:
+<img src="schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+
+<p>
+Warning: All devices are connected in parallel. Make sure that audio
+producing device can handle combined load. See:
+<a href="https://en.wikipedia.org/wiki/Series_and_parallel_circuits#Resistance_units_2">https://en.wikipedia.org/wiki/Series_and_parallel_circuits#Resistance_units_2</a>
+</p>
+
+
+<figure>
+<p><img src="make,%202.png" class="img-responsive" alt="make,%202.png">
+</p>
+</figure>
+
+<p>
+Device consists of body and cover that are held together by single
+screw at the center:
+</p>
+
+
+<figure>
+<p><img src="cover,%202.png" class="img-responsive" alt="cover,%202.png">
+</p>
+</figure>
+</div>
+</div>
+
+<div id="outline-container-sec-3" class="outline-2">
+<h2 id="sec-3"><span class="section-number-2">3</span> Download</h2>
+<div class="outline-text-2" id="text-3">
+<ul class="org-ul">
+<li><a href="hub.FCStd">FreeCAD project</a>
+</li>
+</ul>
+
+
+<p>
+Body <a href="body.stl">STL file</a>
+<img src="body.png" class="img-responsive" alt="body.png">
+</p>
+
+
+
+<hr >
+<p>
+Cover <a href="cover.stl">STL file</a>
+</p>
+
+
+<figure>
+<p><img src="cover.png" class="img-responsive" alt="cover.png">
+</p>
+</figure>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. General</a></li>
+<li><a href="#sec-2">2. Project description</a></li>
+<li><a href="#sec-3">3. Download</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2020-12-25 Fri 23:48</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
+</div>
+</footer>
+</body>
+</html>
--- /dev/null
+#+TITLE: Headphone hub
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Author:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+Simple hub that allows connecting up to 4 devices via headphone
+jack. For example single laptop or mp3 player can power up to 3
+headphones.
+
+[[file:make.png]]
+
+Schematic diagram:
+[[file:schematic.png]]
+
+Warning: All devices are connected in parallel. Make sure that audio
+producing device can handle combined load. See:
+https://en.wikipedia.org/wiki/Series_and_parallel_circuits#Resistance_units_2
+
+[[file:make,%202.png]]
+
+Device consists of body and cover that are held together by single
+screw at the center:
+
+[[file:cover,%202.png]]
+
+* Download
+
+- [[file:hub.FCStd][FreeCAD project]]
+
+
+Body [[file:body.stl][STL file]]
+[[file:body.png]]
+
+
+
+-----
+Cover [[file:cover.stl][STL file]]
+
+[[file:cover.png]]
--- /dev/null
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Connector_AudioJack3
+#
+DEF Connector_AudioJack3 J 0 20 Y Y 1 F N
+F0 "J" 0 350 50 H V C CNN
+F1 "Connector_AudioJack3" 0 250 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Jack*
+$ENDFPLIST
+DRAW
+S -200 -200 -250 -100 0 1 10 F
+S 100 150 -200 -200 0 1 10 f
+P 4 0 1 10 0 -100 25 -125 50 -100 100 -100 N
+P 5 0 1 10 -75 -100 -50 -125 -25 -100 -25 0 100 0 N
+P 5 0 1 10 100 100 -100 100 -100 -100 -125 -125 -150 -100 N
+X ~ R 200 0 100 L 50 50 1 1 P
+X ~ S 200 100 100 L 50 50 1 1 P
+X ~ T 200 -100 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+#End Library
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 1
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L Connector:AudioJack3 J1
+U 1 1 5FE65EA5
+P 3100 3300
+F 0 "J1" V 3036 3488 50 0000 L CNN
+F 1 "AudioJack3" V 3127 3488 50 0000 L CNN
+F 2 "" H 3100 3300 50 0001 C CNN
+F 3 "~" H 3100 3300 50 0001 C CNN
+ 1 3100 3300
+ 0 1 1 0
+$EndComp
+$Comp
+L Connector:AudioJack3 J2
+U 1 1 5FE6658D
+P 4000 3300
+F 0 "J2" V 3936 3488 50 0000 L CNN
+F 1 "AudioJack3" V 4027 3488 50 0000 L CNN
+F 2 "" H 4000 3300 50 0001 C CNN
+F 3 "~" H 4000 3300 50 0001 C CNN
+ 1 4000 3300
+ 0 1 1 0
+$EndComp
+$Comp
+L Connector:AudioJack3 J3
+U 1 1 5FE66E55
+P 4850 3300
+F 0 "J3" V 4786 3488 50 0000 L CNN
+F 1 "AudioJack3" V 4877 3488 50 0000 L CNN
+F 2 "" H 4850 3300 50 0001 C CNN
+F 3 "~" H 4850 3300 50 0001 C CNN
+ 1 4850 3300
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 3000 3500 3000 3800
+Wire Wire Line
+ 3000 3800 3900 3800
+Wire Wire Line
+ 3900 3800 3900 3500
+Wire Wire Line
+ 3900 3800 4750 3800
+Wire Wire Line
+ 4750 3800 4750 3500
+Connection ~ 3900 3800
+Wire Wire Line
+ 3100 3500 3100 3750
+Wire Wire Line
+ 3100 3750 4000 3750
+Wire Wire Line
+ 4000 3750 4000 3500
+Wire Wire Line
+ 4000 3750 4850 3750
+Wire Wire Line
+ 4850 3750 4850 3500
+Connection ~ 4000 3750
+Wire Wire Line
+ 3200 3500 3200 3700
+Wire Wire Line
+ 3200 3700 4100 3700
+Wire Wire Line
+ 4100 3700 4100 3500
+Wire Wire Line
+ 4100 3700 4950 3700
+Wire Wire Line
+ 4950 3700 4950 3500
+Connection ~ 4100 3700
+$Comp
+L Connector:AudioJack3 J4
+U 1 1 5FE687FA
+P 5700 3300
+F 0 "J4" V 5636 3488 50 0000 L CNN
+F 1 "AudioJack3" V 5727 3488 50 0000 L CNN
+F 2 "" H 5700 3300 50 0001 C CNN
+F 3 "~" H 5700 3300 50 0001 C CNN
+ 1 5700 3300
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 4750 3800 5600 3800
+Wire Wire Line
+ 5600 3800 5600 3500
+Wire Wire Line
+ 4850 3750 5700 3750
+Wire Wire Line
+ 5700 3750 5700 3500
+Wire Wire Line
+ 4950 3700 5800 3700
+Wire Wire Line
+ 5800 3700 5800 3500
+Connection ~ 4750 3800
+Connection ~ 4850 3750
+Connection ~ 4950 3700
+$EndSCHEMATC
--- /dev/null
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+<head>
+<!-- 2021-07-25 Sun 21:01 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>General purpose hook</title>
+<meta name="generator" content="Org mode" />
+<meta name="author" content="Svjatoslav Agejenko" />
+<style type="text/css">
+ <!--/*--><![CDATA[/*><!--*/
+ .title { text-align: center;
+ margin-bottom: .2em; }
+ .subtitle { text-align: center;
+ font-size: medium;
+ font-weight: bold;
+ margin-top:0; }
+ .todo { font-family: monospace; color: red; }
+ .done { font-family: monospace; color: green; }
+ .priority { font-family: monospace; color: orange; }
+ .tag { background-color: #eee; font-family: monospace;
+ padding: 2px; font-size: 80%; font-weight: normal; }
+ .timestamp { color: #bebebe; }
+ .timestamp-kwd { color: #5f9ea0; }
+ .org-right { margin-left: auto; margin-right: 0px; text-align: right; }
+ .org-left { margin-left: 0px; margin-right: auto; text-align: left; }
+ .org-center { margin-left: auto; margin-right: auto; text-align: center; }
+ .underline { text-decoration: underline; }
+ #postamble p, #preamble p { font-size: 90%; margin: .2em; }
+ p.verse { margin-left: 3%; }
+ pre {
+ border: 1px solid #ccc;
+ box-shadow: 3px 3px 3px #eee;
+ padding: 8pt;
+ font-family: monospace;
+ overflow: auto;
+ margin: 1.2em;
+ }
+ pre.src {
+ position: relative;
+ overflow: auto;
+ padding-top: 1.2em;
+ }
+ pre.src:before {
+ display: none;
+ position: absolute;
+ background-color: white;
+ top: -10px;
+ right: 10px;
+ padding: 3px;
+ border: 1px solid black;
+ }
+ pre.src:hover:before { display: inline; margin-top: 14px;}
+ /* Languages per Org manual */
+ pre.src-asymptote:before { content: 'Asymptote'; }
+ pre.src-awk:before { content: 'Awk'; }
+ pre.src-C:before { content: 'C'; }
+ /* pre.src-C++ doesn't work in CSS */
+ pre.src-clojure:before { content: 'Clojure'; }
+ pre.src-css:before { content: 'CSS'; }
+ pre.src-D:before { content: 'D'; }
+ pre.src-ditaa:before { content: 'ditaa'; }
+ pre.src-dot:before { content: 'Graphviz'; }
+ pre.src-calc:before { content: 'Emacs Calc'; }
+ pre.src-emacs-lisp:before { content: 'Emacs Lisp'; }
+ pre.src-fortran:before { content: 'Fortran'; }
+ pre.src-gnuplot:before { content: 'gnuplot'; }
+ pre.src-haskell:before { content: 'Haskell'; }
+ pre.src-hledger:before { content: 'hledger'; }
+ pre.src-java:before { content: 'Java'; }
+ pre.src-js:before { content: 'Javascript'; }
+ pre.src-latex:before { content: 'LaTeX'; }
+ pre.src-ledger:before { content: 'Ledger'; }
+ pre.src-lisp:before { content: 'Lisp'; }
+ pre.src-lilypond:before { content: 'Lilypond'; }
+ pre.src-lua:before { content: 'Lua'; }
+ pre.src-matlab:before { content: 'MATLAB'; }
+ pre.src-mscgen:before { content: 'Mscgen'; }
+ pre.src-ocaml:before { content: 'Objective Caml'; }
+ pre.src-octave:before { content: 'Octave'; }
+ pre.src-org:before { content: 'Org mode'; }
+ pre.src-oz:before { content: 'OZ'; }
+ pre.src-plantuml:before { content: 'Plantuml'; }
+ pre.src-processing:before { content: 'Processing.js'; }
+ pre.src-python:before { content: 'Python'; }
+ pre.src-R:before { content: 'R'; }
+ pre.src-ruby:before { content: 'Ruby'; }
+ pre.src-sass:before { content: 'Sass'; }
+ pre.src-scheme:before { content: 'Scheme'; }
+ pre.src-screen:before { content: 'Gnu Screen'; }
+ pre.src-sed:before { content: 'Sed'; }
+ pre.src-sh:before { content: 'shell'; }
+ pre.src-sql:before { content: 'SQL'; }
+ pre.src-sqlite:before { content: 'SQLite'; }
+ /* additional languages in org.el's org-babel-load-languages alist */
+ pre.src-forth:before { content: 'Forth'; }
+ pre.src-io:before { content: 'IO'; }
+ pre.src-J:before { content: 'J'; }
+ pre.src-makefile:before { content: 'Makefile'; }
+ pre.src-maxima:before { content: 'Maxima'; }
+ pre.src-perl:before { content: 'Perl'; }
+ pre.src-picolisp:before { content: 'Pico Lisp'; }
+ pre.src-scala:before { content: 'Scala'; }
+ pre.src-shell:before { content: 'Shell Script'; }
+ pre.src-ebnf2ps:before { content: 'ebfn2ps'; }
+ /* additional language identifiers per "defun org-babel-execute"
+ in ob-*.el */
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+ pre.src-groovy:before { content: 'Groovy'; }
+ /* additional language identifiers from org-babel-shell-names in
+ ob-shell.el: ob-shell is the only babel language using a lambda to put
+ the execution function name together. */
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+ pre.src-csh:before { content: 'csh'; }
+ pre.src-ash:before { content: 'ash'; }
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+ pre.src-ksh:before { content: 'ksh'; }
+ pre.src-mksh:before { content: 'mksh'; }
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+ /*]]>*/-->
+</style>
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+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+<style type="text/css">
+footer {background-color: #111 !important;}
+pre {background-color: #111; color: #ccc;}
+</style>
+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
+<script type="text/javascript">
+// @license magnet:?xt=urn:btih:e95b018ef3580986a04669f1b5879592219e2a7a&dn=public-domain.txt Public Domain
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+// @license-end
+</script>
+</head>
+<body>
+<div id="content">
+<h1 class="title">General purpose hook</h1>
+<div id="table-of-contents">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents">
+<ul>
+<li><a href="#orgb85c500">1. General</a></li>
+<li><a href="#org7a16f2f">2. Project description</a></li>
+<li><a href="#org1b91912">3. Files</a></li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-orgb85c500" class="outline-2">
+<h2 id="orgb85c500"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.</li>
+
+<li>Author:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko</li>
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a></li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a></li>
+</ul></li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a></li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a></li>
+</ul></li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-org7a16f2f" class="outline-2">
+<h2 id="org7a16f2f"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+
+<div id="org7b3170b" class="figure">
+<p><img src="make.png" alt="make.png" />
+</p>
+</div>
+
+<p>
+General purpose hook suitable for holding light things. Hook does not
+have screw holes. It is intended to be glued to the surface.
+</p>
+
+
+<div id="org1e03952" class="figure">
+<p><img src="hook.png" alt="hook.png" />
+</p>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org1b91912" class="outline-2">
+<h2 id="org1b91912"><span class="section-number-2">3</span> Files</h2>
+<div class="outline-text-2" id="text-3">
+<p>
+You can <a href="hook.FCStd">download FreeCAD project</a> file to tweak design or generated STL
+file ready for 3D printing:
+</p>
+
+<ul class="org-ul">
+<li><a href="hook.stl">hook.stl</a></li>
+</ul>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2021-07-25 Sun 21:01</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
--- /dev/null
+#+TITLE: General purpose hook
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Author:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+[[file:make.png]]
+
+General purpose hook suitable for holding light things. Hook does not
+have screw holes. It is intended to be glued to the surface.
+
+[[file:hook.png]]
+
+* Files
+You can [[file:hook.FCStd][download FreeCAD project]] file to tweak design or generated STL
+file ready for 3D printing:
+
++ [[file:hook.stl]]
--- /dev/null
+<!doctype html>
+<html lang="en">
+<head>
+<title>Portable stereo speaker</title>
+<!-- 2020-04-12 P 23:58 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="generator" content="Org-mode">
+<meta name="author" content="Svjatoslav Agejenko">
+<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+<style type="text/css">
+footer {background-color: #111 !important;}
+pre {background-color: #111; color: #ccc;}
+</style>
+<style type="text/css">
+/* org mode styles on top of twbs */
+
+html {
+ position: relative;
+ min-height: 100%;
+}
+
+body {
+ font-size: 18px;
+ margin-bottom: 105px;
+}
+
+footer {
+ position: absolute;
+ bottom: 0;
+ width: 100%;
+ height: 101px;
+ background-color: #f5f5f5;
+}
+
+footer > div {
+ padding: 10px;
+}
+
+footer p {
+ margin: 0 0 5px;
+ text-align: center;
+ font-size: 16px;
+}
+
+#table-of-contents {
+ margin-top: 20px;
+ margin-bottom: 20px;
+}
+
+blockquote p {
+ font-size: 18px;
+}
+
+pre {
+ font-size: 16px;
+}
+
+.footpara {
+ display: inline-block;
+}
+
+figcaption {
+ font-size: 16px;
+ color: #666;
+ font-style: italic;
+ padding-bottom: 15px;
+}
+
+/* from twbs docs */
+
+.bs-docs-sidebar.affix {
+ position: static;
+}
+@media (min-width: 768px) {
+ .bs-docs-sidebar {
+ padding-left: 20px;
+ }
+}
+
+/* All levels of nav */
+.bs-docs-sidebar .nav > li > a {
+ display: block;
+ padding: 4px 20px;
+ font-size: 14px;
+ font-weight: 500;
+ color: #999;
+}
+.bs-docs-sidebar .nav > li > a:hover,
+.bs-docs-sidebar .nav > li > a:focus {
+ padding-left: 19px;
+ color: #A1283B;
+ text-decoration: none;
+ background-color: transparent;
+ border-left: 1px solid #A1283B;
+}
+.bs-docs-sidebar .nav > .active > a,
+.bs-docs-sidebar .nav > .active:hover > a,
+.bs-docs-sidebar .nav > .active:focus > a {
+ padding-left: 18px;
+ font-weight: bold;
+ color: #A1283B;
+ background-color: transparent;
+ border-left: 2px solid #A1283B;
+}
+
+/* Nav: second level (shown on .active) */
+.bs-docs-sidebar .nav .nav {
+ display: none; /* Hide by default, but at >768px, show it */
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+}
+.bs-docs-sidebar .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 30px;
+ font-size: 12px;
+ font-weight: normal;
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+.bs-docs-sidebar .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav > li > a:focus {
+ padding-left: 29px;
+}
+.bs-docs-sidebar .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav > .active:focus > a {
+ padding-left: 28px;
+ font-weight: 500;
+}
+
+/* Nav: third level (shown on .active) */
+.bs-docs-sidebar .nav .nav .nav {
+ padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 40px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav .nav > li > a:focus {
+ padding-left: 39px;
+}
+.bs-docs-sidebar .nav .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
+ padding-left: 38px;
+ font-weight: 500;
+}
+
+/* Show and affix the side nav when space allows it */
+@media (min-width: 992px) {
+ .bs-docs-sidebar .nav > .active > ul {
+ display: block;
+ }
+ /* Widen the fixed sidebar */
+ .bs-docs-sidebar.affix,
+ .bs-docs-sidebar.affix-bottom {
+ width: 213px;
+ }
+ .bs-docs-sidebar.affix {
+ position: fixed; /* Undo the static from mobile first approach */
+ top: 20px;
+ }
+ .bs-docs-sidebar.affix-bottom {
+ position: absolute; /* Undo the static from mobile first approach */
+ }
+ .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
+ margin-top: 0;
+ margin-bottom: 0
+ }
+}
+@media (min-width: 1200px) {
+ /* Widen the fixed sidebar again */
+ .bs-docs-sidebar.affix-bottom,
+ .bs-docs-sidebar.affix {
+ width: 263px;
+ }
+}
+</style>
+<script type="text/javascript">
+$(function() {
+ 'use strict';
+
+ $('.bs-docs-sidebar li').first().addClass('active');
+
+ $(document.body).scrollspy({target: '.bs-docs-sidebar'});
+
+ $('.bs-docs-sidebar').affix();
+});
+</script>
+</head>
+<body>
+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">Portable stereo speaker</h1>
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.
+</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.
+</li>
+
+<li>Author:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+</li>
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
+</li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a>
+</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+I had pair of good compact stereo speakers lying uselessly around as
+well as secondhand TDA2030 Chinese knockoff audio amplifier chips.
+Also I wanted to test modular construction approach: motherboard with
+shared bus and functionality realized via pluggable modules. So I
+built stereo speaker:
+</p>
+
+
+<figure>
+<p><img src="make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+
+<p>
+Indicator on the front panel shows available power within the
+system. Ideally it should be at the maximum. It drops when batteries
+run empty or when consumed power (too loud music) is greater than
+onboard power supply or batteries can handle. It has on/off switch and
+stereo audio input. Audio input impedance is about 100 ohms.
+</p>
+
+
+<figure>
+<p><img src="make,%20side.png" class="img-responsive" alt="make,%20side.png">
+</p>
+</figure>
+
+<p>
+Idea for the holes on the top and smaller ones on the bottom back is
+to enable air flow for passive cooling.
+</p>
+
+
+<figure>
+<p><img src="make,%20back.png" class="img-responsive" alt="make,%20back.png">
+</p>
+</figure>
+
+<p>
+Entire construction is made of parts, no larger than
+120x120x120mm. Maximum for my printer.
+</p>
+</div>
+</div>
+
+<div id="outline-container-sec-3" class="outline-2">
+<h2 id="sec-3"><span class="section-number-2">3</span> Battery holder</h2>
+<div class="outline-text-2" id="text-3">
+<p>
+Device is powered by 4 times AA NiMH batteries (1.2V each).
+</p>
+
+
+<figure>
+<p><img src="battery%20holder/schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+</figure>
+
+<p>
+I happened to have AA battery adapters lying around with different
+bottom hole configurations. Therefore this weird hole design:
+</p>
+
+
+<figure>
+<p><img src="battery%20holder/battery%20holder.png" class="img-responsive" alt="battery%20holder.png">
+</p>
+</figure>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="battery%20holder/battery%20holder.FCStd">FreeCAD file</a>
+</li>
+<li><a href="battery%20holder/battery%20holder.stl">STL file</a>
+</li>
+</ul>
+
+<p>
+Result:
+<img src="battery%20holder/make.png" class="img-responsive" alt="make.png">
+</p>
+
+<p>
+Attaches to the back of the body:
+<img src="battery%20holder/mounted%20on%20the%20back.png" class="img-responsive" alt="mounted%20on%20the%20back.png">
+</p>
+</div>
+</div>
+
+<div id="outline-container-sec-4" class="outline-2">
+<h2 id="sec-4"><span class="section-number-2">4</span> 20V up-step module</h2>
+<div class="outline-text-2" id="text-4">
+<p>
+Battery pack voltage is routed through main on/off switch on the front
+panel, and then it goes to the 20V up-step module.
+</p>
+
+
+<figure>
+<p><img src="20V%20upstep%20module/schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+</figure>
+
+<p>
+It uses ready made upstep module, but adds extra voltage filtering via
+inductor and capacitors.
+</p>
+
+
+<figure>
+<p><img src="20V%20upstep%20module/make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+</div>
+</div>
+
+<div id="outline-container-sec-5" class="outline-2">
+<h2 id="sec-5"><span class="section-number-2">5</span> Main board</h2>
+<div class="outline-text-2" id="text-5">
+<p>
+Voltage upstep above sits on top of main board (motherboard). It has
+uniform central bus that spans all connectors.
+</p>
+
+
+<figure>
+<p><img src="main%20board/internal%20bus.png" class="img-responsive" alt="internal%20bus.png">
+</p>
+</figure>
+
+
+<figure>
+<p><img src="main%20board/bus%20on%20the%20bottom,%202.png" class="img-responsive" alt="bus%20on%20the%20bottom,%202.png">
+</p>
+</figure>
+
+<p>
+First row of the main board is special IO terminal (for connecting
+speakers, front panel, etc..)
+</p>
+
+
+<figure>
+<p><img src="main%20board/IO%20terminal.png" class="img-responsive" alt="IO%20terminal.png">
+</p>
+</figure>
+
+<p>
+Remaining rows are for connecting boards:
+</p>
+
+
+<figure>
+<p><img src="main%20board/1.png" class="img-responsive" alt="1.png">
+</p>
+</figure>
+
+<p>
+To provide structural support, main board is attached to frame:
+</p>
+
+
+<figure>
+<p><img src="main%20board/board%20fixator%20body.png" class="img-responsive" alt="board%20fixator%20body.png">
+</p>
+</figure>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="main%20board/board%20fixator%20body.FCStd">FreeCAD file</a>
+</li>
+<li><a href="main%20board/board%20fixator%20body.stl">STL file</a>
+</li>
+</ul>
+
+<p>
+And boards plugged into main board are fixed at the top, using clip:
+</p>
+
+
+<figure>
+<p><img src="main%20board/board%20fixator%20top%20clip.png" class="img-responsive" alt="board%20fixator%20top%20clip.png">
+</p>
+</figure>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="main%20board/board%20fixator%20top%20clip.FCStd">FreeCAD file</a>
+</li>
+<li><a href="main%20board/board%20fixator%20top%20clip.stl">STL file</a>
+</li>
+</ul>
+
+<p>
+Result:
+</p>
+
+
+<figure>
+<p><img src="main%20board/bus%20on%20the%20bottom,%201.png" class="img-responsive" alt="bus%20on%20the%20bottom,%201.png">
+</p>
+</figure>
+
+
+<figure>
+<p><img src="main%20board/board%20fixator.png" class="img-responsive" alt="board%20fixator.png">
+</p>
+</figure>
+</div>
+</div>
+
+<div id="outline-container-sec-6" class="outline-2">
+<h2 id="sec-6"><span class="section-number-2">6</span> Mono audio amplifier module</h2>
+<div class="outline-text-2" id="text-6">
+<p>
+Design uses scavenged secondhand Chinese TDA2030 audio amp
+clones. Each chip is mono audio amplifier. Therefore 2 almost
+identical audio amp modules had to be built, one for left speaker, one
+for right.
+</p>
+
+
+<figure>
+<p><img src="mono%20audio%20amp%20module/schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+</figure>
+
+<p>
+I like to build on top of prototype PCBs. Gives results much faster
+for one-off projects. Before soldering, I solve component layout on
+paper:
+</p>
+
+
+<figure>
+<p><img src="mono%20audio%20amp%20module/PCB%20layout.png" class="img-responsive" alt="PCB%20layout.png">
+</p>
+</figure>
+
+<p>
+Result - front:
+</p>
+
+
+<figure>
+<p><img src="mono%20audio%20amp%20module/assembled%20front.png" class="img-responsive" alt="assembled%20front.png">
+</p>
+</figure>
+
+<p>
+Result - back:
+</p>
+
+
+<figure>
+<p><img src="mono%20audio%20amp%20module/assembled%20back.png" class="img-responsive" alt="assembled%20back.png">
+</p>
+</figure>
+
+<p>
+Here copper tape is used as improvised heatsink.
+</p>
+</div>
+</div>
+
+<div id="outline-container-sec-7" class="outline-2">
+<h2 id="sec-7"><span class="section-number-2">7</span> Speakers</h2>
+<div class="outline-text-2" id="text-7">
+<p>
+High frequency small speaker and medium frequency bigger speaker are
+combined.
+</p>
+
+
+<figure>
+<p><img src="speakers/schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+</figure>
+
+<p>
+Capacitor acts as high-pass filter on top of tiny PCB:
+</p>
+
+
+<figure>
+<p><img src="speakers/PCB%20layout.png" class="img-responsive" alt="PCB%20layout.png">
+</p>
+</figure>
+
+<p>
+Speaker enclosure:
+</p>
+
+
+<figure>
+<p><img src="speakers/speaker%20enclosure.png" class="img-responsive" alt="speaker%20enclosure.png">
+</p>
+</figure>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="speakers/speaker%20enclosure.FCStd">FreeCAD file</a>
+</li>
+<li><a href="speakers/speaker%20enclosure.stl">STL file</a>
+</li>
+</ul>
+
+<p>
+Speaker enclosure cover:
+</p>
+
+
+<figure>
+<p><img src="speakers/speaker%20enclosure%20cover.png" class="img-responsive" alt="speaker%20enclosure%20cover.png">
+</p>
+</figure>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="speakers/speaker%20enclosure%20cover.FCStd">FreeCAD file</a>
+</li>
+<li><a href="speakers/speaker%20enclosure%20cover.stl">STL file</a>
+</li>
+</ul>
+
+<p>
+Result:
+</p>
+
+
+<figure>
+<p><img src="speakers/make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+</div>
+</div>
+
+<div id="outline-container-sec-8" class="outline-2">
+<h2 id="sec-8"><span class="section-number-2">8</span> Front panel</h2>
+<div class="outline-text-2" id="text-8">
+<p>
+Initial idea was really simple panel:
+</p>
+<ul class="org-ul">
+<li>on/off switch
+</li>
+<li>system power indicator
+</li>
+<li>stereo audio input
+</li>
+</ul>
+
+<p>
+But, since I'm using "agile" approach, during load-testing, it become
+clear that active fan based cooling would be nice (when playing loud
+music). I found tiny cooler fan that needs 5 volts to operate. Also I
+need to power backlight for power indicator. For both of these cases,
+I decided to add another voltage up-step module (target voltage output
+set to 6V). This time directly on the front panel.
+</p>
+
+
+<figure>
+<p><img src="front%20panel/schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+</figure>
+
+<p>
+Front panel case:
+</p>
+
+
+<figure>
+<p><img src="front%20panel/front%20panel,%20front.png" class="img-responsive" alt="front%20panel,%20front.png">
+</p>
+</figure>
+
+
+<figure>
+<p><img src="front%20panel/front%20panel,%20back.png" class="img-responsive" alt="front%20panel,%20back.png">
+</p>
+</figure>
+
+<p>
+Electronics fits inside:
+</p>
+
+
+<figure>
+<p><img src="front%20panel/front%20panel,%20back,%20make.png" class="img-responsive" alt="front%20panel,%20back,%20make.png">
+</p>
+</figure>
+
+<p>
+Front view:
+</p>
+
+
+<figure>
+<p><img src="front%20panel/front%20panel,%20front,%20make.png" class="img-responsive" alt="front%20panel,%20front,%20make.png">
+</p>
+</figure>
+
+<p>
+And attaches to the remaining components:
+</p>
+
+
+<figure>
+<p><img src="front%20panel/attachment.png" class="img-responsive" alt="attachment.png">
+</p>
+</figure>
+</div>
+</div>
+
+
+<div id="outline-container-sec-9" class="outline-2">
+<h2 id="sec-9"><span class="section-number-2">9</span> Extra capacitors</h2>
+<div class="outline-text-2" id="text-9">
+<p>
+Another thing that become clear during load-testing: output
+power/volume can be further enhanced by adding high power capacitors
+to even out load on primary 20V up-step module.
+</p>
+
+
+<figure>
+<p><img src="extra%20capacitors/extra%20caps.png" class="img-responsive" alt="extra%20caps.png">
+</p>
+</figure>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="extra%20capacitors/extra%20caps.FCStd">FreeCAD project</a>
+</li>
+<li><a href="extra%20capacitors/extra%20caps.stl">STL file</a>
+</li>
+</ul>
+
+<p>
+Extra caps are mounted on top of the speaker and electrically attached
+to the main board.
+</p>
+
+
+<figure>
+<p><img src="extra%20capacitors/make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+</div>
+</div>
+
+<div id="outline-container-sec-10" class="outline-2">
+<h2 id="sec-10"><span class="section-number-2">10</span> Center box</h2>
+<div class="outline-text-2" id="text-10">
+<p>
+Last physical part, to attach it all together: central body.
+</p>
+
+<p>
+Front:
+<img src="center%20box/front.png" class="img-responsive" alt="front.png">
+</p>
+
+<p>
+Back:
+<img src="center%20box/back.png" class="img-responsive" alt="back.png">
+</p>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="center%20box/center%20box.FCStd">FreeCAD file</a>
+</li>
+<li><a href="center%20box/center%20box.stl">STL file</a>
+</li>
+</ul>
+</div>
+</div>
+
+
+<div id="outline-container-sec-11" class="outline-2">
+<h2 id="sec-11"><span class="section-number-2">11</span> Conclusions / TODO</h2>
+<div class="outline-text-2" id="text-11">
+<p>
+These things could be done better:
+</p>
+
+<ul class="org-ul">
+<li>Instead of using undersized heatsinks on the audio amplifiers and
+need for active cooling as a consequence, it would be better to try
+to mount audio amplifier chip on top of speaker metallic body. It
+would provide plenty of cooling and reduces power losses within
+cable, since amplifier would be as close to the speaker as possible.
+</li>
+
+<li>I used agile design. That is, implemented functionality ad-hoc. If I
+had done design in advance, then I could have had smarter connector
+layout between main board and front panel. That is: Instead of
+multiple smaller cables, one wide (multi connector) cable.
+</li>
+
+<li>Screw holes are too close to the edges on the front panel.
+</li>
+
+<li>It would be better if screw heads were slightly buried within
+construction body.
+</li>
+</ul>
+
+
+<p>
+Overall, it was good learning experience and I was able to test
+various ideas on it. Will add cooler later :)
+</p>
+
+
+<p>
+Photo of initial PSU + audio amp test:
+</p>
+
+
+<figure>
+<p><img src="initial%20test.png" class="img-responsive" alt="initial%20test.png">
+</p>
+</figure>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. General</a></li>
+<li><a href="#sec-2">2. Project description</a></li>
+<li><a href="#sec-3">3. Battery holder</a></li>
+<li><a href="#sec-4">4. 20V up-step module</a></li>
+<li><a href="#sec-5">5. Main board</a></li>
+<li><a href="#sec-6">6. Mono audio amplifier module</a></li>
+<li><a href="#sec-7">7. Speakers</a></li>
+<li><a href="#sec-8">8. Front panel</a></li>
+<li><a href="#sec-9">9. Extra capacitors</a></li>
+<li><a href="#sec-10">10. Center box</a></li>
+<li><a href="#sec-11">11. Conclusions / TODO</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2020-04-12 P 23:58</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
+</div>
+</footer>
+</body>
+</html>
--- /dev/null
+#+TITLE: Portable stereo speaker
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Author:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+I had pair of good compact stereo speakers lying uselessly around as
+well as secondhand TDA2030 Chinese knockoff audio amplifier chips.
+Also I wanted to test modular construction approach: motherboard with
+shared bus and functionality realized via pluggable modules. So I
+built stereo speaker:
+
+[[file:make.png]]
+
+Indicator on the front panel shows available power within the
+system. Ideally it should be at the maximum. It drops when batteries
+run empty or when consumed power (too loud music) is greater than
+onboard power supply or batteries can handle. It has on/off switch and
+stereo audio input. Audio input impedance is about 100 ohms.
+
+[[file:make,%20side.png]]
+
+Idea for the holes on the top and smaller ones on the bottom back is
+to enable air flow for passive cooling.
+
+[[file:make,%20back.png]]
+
+Entire construction is made of parts, no larger than
+120x120x120mm. Maximum for my printer.
+
+* Battery holder
+Device is powered by 4 times AA NiMH batteries (1.2V each).
+
+[[file:battery%20holder/schematic.png]]
+
+I happened to have AA battery adapters lying around with different
+bottom hole configurations. Therefore this weird hole design:
+
+[[file:battery%20holder/battery%20holder.png]]
+
+Download:
++ [[file:battery%20holder/battery%20holder.FCStd][FreeCAD file]]
++ [[file:battery%20holder/battery%20holder.stl][STL file]]
+
+Result:
+[[file:battery%20holder/make.png]]
+
+Attaches to the back of the body:
+[[file:battery%20holder/mounted%20on%20the%20back.png]]
+
+* 20V up-step module
+Battery pack voltage is routed through main on/off switch on the front
+panel, and then it goes to the 20V up-step module.
+
+[[file:20V%20upstep%20module/schematic.png]]
+
+It uses ready made upstep module, but adds extra voltage filtering via
+inductor and capacitors.
+
+[[file:20V%20upstep%20module/make.png]]
+
+* Main board
+
+Voltage upstep above sits on top of main board (motherboard). It has
+uniform central bus that spans all connectors.
+
+[[file:main%20board/internal%20bus.png]]
+
+[[file:main%20board/bus%20on%20the%20bottom,%202.png]]
+
+First row of the main board is special IO terminal (for connecting
+speakers, front panel, etc..)
+
+[[file:main%20board/IO%20terminal.png]]
+
+Remaining rows are for connecting boards:
+
+[[file:main%20board/1.png]]
+
+To provide structural support, main board is attached to frame:
+
+[[file:main%20board/board%20fixator%20body.png]]
+
+Download:
++ [[file:main%20board/board%20fixator%20body.FCStd][FreeCAD file]]
++ [[file:main%20board/board%20fixator%20body.stl][STL file]]
+
+And boards plugged into main board are fixed at the top, using clip:
+
+[[file:main%20board/board%20fixator%20top%20clip.png]]
+
+Download:
++ [[file:main%20board/board%20fixator%20top%20clip.FCStd][FreeCAD file]]
++ [[file:main%20board/board%20fixator%20top%20clip.stl][STL file]]
+
+Result:
+
+[[file:main%20board/bus%20on%20the%20bottom,%201.png]]
+
+[[file:main%20board/board%20fixator.png]]
+
+* Mono audio amplifier module
+
+Design uses scavenged secondhand Chinese TDA2030 audio amp
+clones. Each chip is mono audio amplifier. Therefore 2 almost
+identical audio amp modules had to be built, one for left speaker, one
+for right.
+
+[[file:mono%20audio%20amp%20module/schematic.png]]
+
+I like to build on top of prototype PCBs. Gives results much faster
+for one-off projects. Before soldering, I solve component layout on
+paper:
+
+[[file:mono%20audio%20amp%20module/PCB%20layout.png]]
+
+Result - front:
+
+[[file:mono%20audio%20amp%20module/assembled%20front.png]]
+
+Result - back:
+
+[[file:mono%20audio%20amp%20module/assembled%20back.png]]
+
+Here copper tape is used as improvised heatsink.
+
+* Speakers
+
+High frequency small speaker and medium frequency bigger speaker are
+combined.
+
+[[file:speakers/schematic.png]]
+
+Capacitor acts as high-pass filter on top of tiny PCB:
+
+[[file:speakers/PCB%20layout.png]]
+
+Speaker enclosure:
+
+[[file:speakers/speaker%20enclosure.png]]
+
+Download:
++ [[file:speakers/speaker%20enclosure.FCStd][FreeCAD file]]
++ [[file:speakers/speaker%20enclosure.stl][STL file]]
+
+Speaker enclosure cover:
+
+[[file:speakers/speaker%20enclosure%20cover.png]]
+
+Download:
++ [[file:speakers/speaker%20enclosure%20cover.FCStd][FreeCAD file]]
++ [[file:speakers/speaker%20enclosure%20cover.stl][STL file]]
+
+Result:
+
+[[file:speakers/make.png]]
+
+* Front panel
+
+Initial idea was really simple panel:
++ on/off switch
++ system power indicator
++ stereo audio input
+
+But, since I'm using "agile" approach, during load-testing, it become
+clear that active fan based cooling would be nice (when playing loud
+music). I found tiny cooler fan that needs 5 volts to operate. Also I
+need to power backlight for power indicator. For both of these cases,
+I decided to add another voltage up-step module (target voltage output
+set to 6V). This time directly on the front panel.
+
+[[file:front%20panel/schematic.png]]
+
+Front panel case:
+
+[[file:front%20panel/front%20panel,%20front.png]]
+
+[[file:front%20panel/front%20panel,%20back.png]]
+
+Electronics fits inside:
+
+[[file:front%20panel/front%20panel,%20back,%20make.png]]
+
+Front view:
+
+[[file:front%20panel/front%20panel,%20front,%20make.png]]
+
+And attaches to the remaining components:
+
+[[file:front%20panel/attachment.png]]
+
+* Extra capacitors
+Another thing that become clear during load-testing: output
+power/volume can be further enhanced by adding high power capacitors
+to even out load on primary 20V up-step module.
+
+[[file:extra%20capacitors/extra%20caps.png]]
+
+Download:
++ [[file:extra%20capacitors/extra%20caps.FCStd][FreeCAD project]]
++ [[file:extra%20capacitors/extra%20caps.stl][STL file]]
+
+Extra caps are mounted on top of the speaker and electrically attached
+to the main board.
+
+[[file:extra%20capacitors/make.png]]
+
+* Center box
+
+Last physical part, to attach it all together: central body.
+
+Front:
+[[file:center%20box/front.png]]
+
+Back:
+[[file:center%20box/back.png]]
+
+Download:
++ [[file:center%20box/center%20box.FCStd][FreeCAD file]]
++ [[file:center%20box/center%20box.stl][STL file]]
+
+* Conclusions / TODO
+Photo of initial PSU + audio amp test:
+[[file:initial%20test.png]]
+
+
+Improvement ideas:
+
++ Instead of using undersized heatsinks on the audio amplifiers and
+ need for active cooling as a consequence, it would be better to try
+ to mount audio amplifier chip on top of speaker metallic body. It
+ would provide plenty of cooling and reduces power losses within
+ cable, since amplifier would be as close to the speaker as possible.
+
++ Add possibility to power device from USB socket in addition to
+ batteries.
+
++ Front panel:
+ + Use digital voltage indicator to gauge remaining battery power.
+
+ + Add possibility to have multiple inputs.
+
+ + It would be better if screw heads were slightly buried within
+ construction body.
+
+ + Screw holes are too close to the edges on the front panel.
--- /dev/null
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Amplifier_Audio_TDA2030
+#
+DEF Amplifier_Audio_TDA2030 U 0 5 Y Y 1 F N
+F0 "U" 150 250 50 H V C CNN
+F1 "Amplifier_Audio_TDA2030" 150 150 50 H V C CNN
+F2 "Package_TO_SOT_THT:TO-220-5_P3.4x3.7mm_StaggerOdd_Lead3.8mm_Vertical" 0 0 50 H I C CIN
+F3 "" 0 0 50 H I C CNN
+ALIAS TDA2050
+$FPLIST
+ TO*220*StaggerOdd*
+$ENDFPLIST
+DRAW
+P 4 0 1 10 -200 200 200 0 -200 -200 -200 200 f
+X + 1 -300 100 100 R 50 50 1 1 I
+X - 2 -300 -100 100 R 50 50 1 1 I
+X -Vs 3 -100 -300 150 U 50 40 1 1 W
+X ~ 4 300 0 100 L 50 50 1 1 O
+X +Vs 5 -100 300 150 D 50 40 1 1 W
+ENDDRAW
+ENDDEF
+#
+# Connector_Conn_01x01_Male
+#
+DEF Connector_Conn_01x01_Male J 0 40 Y N 1 F N
+F0 "J" 0 100 50 H V C CNN
+F1 "Connector_Conn_01x01_Male" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Connector*:*
+$ENDFPLIST
+DRAW
+S 34 5 0 -5 1 1 6 F
+P 2 1 1 6 50 0 34 0 N
+X Pin_1 1 200 0 150 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_C
+#
+DEF Device_C C 0 10 N Y 1 F N
+F0 "C" 25 100 50 H V L CNN
+F1 "Device_C" 25 -100 50 H V L CNN
+F2 "" 38 -150 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ C_*
+$ENDFPLIST
+DRAW
+P 2 0 1 20 -80 -30 80 -30 N
+P 2 0 1 20 -80 30 80 30 N
+X ~ 1 0 150 110 D 50 50 1 1 P
+X ~ 2 0 -150 110 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_D
+#
+DEF Device_D D 0 40 N N 1 F N
+F0 "D" 0 100 50 H V C CNN
+F1 "Device_D" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ TO-???*
+ *_Diode_*
+ *SingleDiode*
+ D_*
+$ENDFPLIST
+DRAW
+P 2 0 1 8 -50 50 -50 -50 N
+P 2 0 1 0 50 0 -50 0 N
+P 4 0 1 8 50 50 50 -50 -50 0 50 50 N
+X K 1 -150 0 100 R 50 50 1 1 P
+X A 2 150 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_R
+#
+DEF Device_R R 0 0 N Y 1 F N
+F0 "R" 80 0 50 V V C CNN
+F1 "Device_R" 0 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ R_*
+$ENDFPLIST
+DRAW
+S -40 -100 40 100 0 1 10 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# power_GND
+#
+DEF power_GND #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -250 50 H I C CNN
+F1 "power_GND" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
+X GND 1 0 0 0 D 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+#End Library
--- /dev/null
+update=22/05/2015 07:44:53
+version=1
+last_client=kicad
+[general]
+version=1
+RootSch=
+BoardNm=
+[pcbnew]
+version=1
+LastNetListRead=
+UseCmpFile=1
+PadDrill=0.600000000000
+PadDrillOvalY=0.600000000000
+PadSizeH=1.500000000000
+PadSizeV=1.500000000000
+PcbTextSizeV=1.500000000000
+PcbTextSizeH=1.500000000000
+PcbTextThickness=0.300000000000
+ModuleTextSizeV=1.000000000000
+ModuleTextSizeH=1.000000000000
+ModuleTextSizeThickness=0.150000000000
+SolderMaskClearance=0.000000000000
+SolderMaskMinWidth=0.000000000000
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+<script type="text/javascript">
+// @license magnet:?xt=urn:btih:e95b018ef3580986a04669f1b5879592219e2a7a&dn=public-domain.txt Public Domain
+<!--/*--><![CDATA[/*><!--*/
+ function CodeHighlightOn(elem, id)
+ {
+ var target = document.getElementById(id);
+ if(null != target) {
+ elem.classList.add("code-highlighted");
+ target.classList.add("code-highlighted");
+ }
+ }
+ function CodeHighlightOff(elem, id)
+ {
+ var target = document.getElementById(id);
+ if(null != target) {
+ elem.classList.remove("code-highlighted");
+ target.classList.remove("code-highlighted");
+ }
+ }
+ /*]]>*///-->
+// @license-end
+</script>
+</head>
+<body>
+<div id="content">
+<h1 class="title">Round ended pincers</h1>
+<div id="table-of-contents">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents">
+<ul>
+<li><a href="#orgcad4de5">1. General</a></li>
+<li><a href="#org180a195">2. Project description</a></li>
+<li><a href="#org0a87982">3. Download</a></li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-orgcad4de5" class="outline-2">
+<h2 id="orgcad4de5"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.</li>
+
+<li>Author:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko</li>
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a></li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a></li>
+</ul></li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a></li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a></li>
+</ul></li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-org180a195" class="outline-2">
+<h2 id="org180a195"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+Pincers allow to push LEGO EV3 rounded pins in and also pull them out.
+</p>
+
+
+<div id="org88effb3" class="figure">
+<p><img src="make.png" alt="make.png" />
+</p>
+</div>
+
+<p>
+Make sure to have strong infill pattern and thick borders when
+printing for maximum strength.
+</p>
+
+<p>
+Schematic:
+<img src="schematic.png" alt="schematic.png" />
+</p>
+
+<p>
+Design has half of the pincers. 2 identical pieces have to be printed
+out and connected at the end with glue and screw.
+</p>
+
+
+<div id="org1d4b3fb" class="figure">
+<p><img src="make, 2.png" alt="make, 2.png" />
+</p>
+</div>
+</div>
+</div>
+
+<div id="outline-container-org0a87982" class="outline-2">
+<h2 id="org0a87982"><span class="section-number-2">3</span> Download</h2>
+<div class="outline-text-2" id="text-3">
+<ul class="org-ul">
+<li><a href="round pincers.FCStd">FreeCAD project</a></li>
+<li><a href="round pincers.stl">STL file</a></li>
+</ul>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2021-04-11 Sun 21:17</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
--- /dev/null
+#+TITLE: Round ended pincers
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Author:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+Pincers allow to push LEGO EV3 rounded pins in and also pull them out.
+
+[[file:make.png]]
+
+Make sure to have strong infill pattern and thick borders when
+printing for maximum strength.
+
+Schematic:
+[[file:schematic.png]]
+
+Design has half of the pincers. 2 identical pieces have to be printed
+out and connected at the end with glue and screw.
+
+[[file:make, 2.png]]
+
+* Download
+
+- [[file:round pincers.FCStd][FreeCAD project]]
+- [[file:round pincers.stl][STL file]]
--- /dev/null
+<!doctype html>
+<html lang="en">
+<head>
+<title>Window holder</title>
+<!-- 2020-06-22 Mon 20:54 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="generator" content="Org-mode">
+<meta name="author" content="Svjatoslav Agejenko">
+<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+<style type="text/css">
+footer {background-color: #111 !important;}
+pre {background-color: #111; color: #ccc;}
+</style>
+<style type="text/css">
+/* org mode styles on top of twbs */
+
+html {
+ position: relative;
+ min-height: 100%;
+}
+
+body {
+ font-size: 18px;
+ margin-bottom: 105px;
+}
+
+footer {
+ position: absolute;
+ bottom: 0;
+ width: 100%;
+ height: 101px;
+ background-color: #f5f5f5;
+}
+
+footer > div {
+ padding: 10px;
+}
+
+footer p {
+ margin: 0 0 5px;
+ text-align: center;
+ font-size: 16px;
+}
+
+#table-of-contents {
+ margin-top: 20px;
+ margin-bottom: 20px;
+}
+
+blockquote p {
+ font-size: 18px;
+}
+
+pre {
+ font-size: 16px;
+}
+
+.footpara {
+ display: inline-block;
+}
+
+figcaption {
+ font-size: 16px;
+ color: #666;
+ font-style: italic;
+ padding-bottom: 15px;
+}
+
+/* from twbs docs */
+
+.bs-docs-sidebar.affix {
+ position: static;
+}
+@media (min-width: 768px) {
+ .bs-docs-sidebar {
+ padding-left: 20px;
+ }
+}
+
+/* All levels of nav */
+.bs-docs-sidebar .nav > li > a {
+ display: block;
+ padding: 4px 20px;
+ font-size: 14px;
+ font-weight: 500;
+ color: #999;
+}
+.bs-docs-sidebar .nav > li > a:hover,
+.bs-docs-sidebar .nav > li > a:focus {
+ padding-left: 19px;
+ color: #A1283B;
+ text-decoration: none;
+ background-color: transparent;
+ border-left: 1px solid #A1283B;
+}
+.bs-docs-sidebar .nav > .active > a,
+.bs-docs-sidebar .nav > .active:hover > a,
+.bs-docs-sidebar .nav > .active:focus > a {
+ padding-left: 18px;
+ font-weight: bold;
+ color: #A1283B;
+ background-color: transparent;
+ border-left: 2px solid #A1283B;
+}
+
+/* Nav: second level (shown on .active) */
+.bs-docs-sidebar .nav .nav {
+ display: none; /* Hide by default, but at >768px, show it */
+ padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 30px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav > li > a:focus {
+ padding-left: 29px;
+}
+.bs-docs-sidebar .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav > .active:focus > a {
+ padding-left: 28px;
+ font-weight: 500;
+}
+
+/* Nav: third level (shown on .active) */
+.bs-docs-sidebar .nav .nav .nav {
+ padding-bottom: 10px;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 40px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav .nav > li > a:focus {
+ padding-left: 39px;
+}
+.bs-docs-sidebar .nav .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
+ padding-left: 38px;
+ font-weight: 500;
+}
+
+/* Show and affix the side nav when space allows it */
+@media (min-width: 992px) {
+ .bs-docs-sidebar .nav > .active > ul {
+ display: block;
+ }
+ /* Widen the fixed sidebar */
+ .bs-docs-sidebar.affix,
+ .bs-docs-sidebar.affix-bottom {
+ width: 213px;
+ }
+ .bs-docs-sidebar.affix {
+ position: fixed; /* Undo the static from mobile first approach */
+ top: 20px;
+ }
+ .bs-docs-sidebar.affix-bottom {
+ position: absolute; /* Undo the static from mobile first approach */
+ }
+ .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
+ margin-top: 0;
+ margin-bottom: 0
+ }
+}
+@media (min-width: 1200px) {
+ /* Widen the fixed sidebar again */
+ .bs-docs-sidebar.affix-bottom,
+ .bs-docs-sidebar.affix {
+ width: 263px;
+ }
+}
+</style>
+<script type="text/javascript">
+$(function() {
+ 'use strict';
+
+ $('.bs-docs-sidebar li').first().addClass('active');
+
+ $(document.body).scrollspy({target: '.bs-docs-sidebar'});
+
+ $('.bs-docs-sidebar').affix();
+});
+</script>
+</head>
+<body>
+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">Window holder</h1>
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.
+</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.
+</li>
+
+<li>Authors:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+<ul class="org-ul">
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
+</li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+
+<li>Valeria Agejenko
+</li>
+</ul>
+</li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a>
+</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+
+<figure>
+<p><img src="make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+
+<p>
+Keeps window open so that strong wind will not slam it close.
+</p>
+
+
+<figure>
+<p><img src="schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+</figure>
+
+<p>
+Download:
+</p>
+<ul class="org-ul">
+<li><a href="window%20fixator.stl">STL file</a>
+</li>
+<li><a href="window%20fixator.FCStd">FreeCAD file</a>
+</li>
+</ul>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. General</a></li>
+<li><a href="#sec-2">2. Project description</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2020-06-22 Mon 20:54</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
+</div>
+</footer>
+</body>
+</html>
--- /dev/null
+#+TITLE: Window holder
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Authors:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
+ - Valeria Agejenko
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+[[file:make.png]]
+
+Keeps window open so that strong wind will not slam it close.
+
+[[file:schematic.png]]
+
+Download:
++ [[file:window%20fixator.stl][STL file]]
++ [[file:window%20fixator.FCStd][FreeCAD file]]
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
-<!-- 2025-04-05 Sat 17:47 -->
+<!-- 2025-04-07 Mon 02:16 -->
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Physical projects</title>
<h2>Table of Contents</h2>
<div id="text-table-of-contents" role="doc-toc">
<ul>
-<li><a href="#org981ac12">1. Overview</a></li>
-<li><a href="#org4994aeb">2. Cases, covers, holders, organizers</a>
+<li><a href="#orgac715c0">1. Overview</a></li>
+<li><a href="#org7a34f0f">2. Cases, covers, holders, organizers</a>
<ul>
-<li><a href="#orgaa16a64">2.1. Measurement device cases</a></li>
-<li><a href="#org46eab79">2.2. Optics</a></li>
-<li><a href="#org6824ed3">2.3. Miscellaneous</a></li>
-<li><a href="#org46f2c43">2.4. Cable / wire</a></li>
+<li><a href="#orgc7f0f02">2.1. Measurement device cases</a></li>
+<li><a href="#org71fba1b">2.2. Optics</a></li>
+<li><a href="#org30459f1">2.3. Miscellaneous</a></li>
+<li><a href="#orgcd58dc4">2.4. Cable / wire</a></li>
</ul>
</li>
-<li><a href="#org25eccfa">3. Furniture</a></li>
-<li><a href="#orgfce274d">4. Miscellaneous</a>
+<li><a href="#org493250f">3. Furniture</a></li>
+<li><a href="#org4b18319">4. Miscellaneous</a>
<ul>
-<li><a href="#orgd3a93bf">4.1. Audio</a></li>
+<li><a href="#orga2611d2">4.1. Audio</a></li>
</ul>
</li>
-<li><a href="#org6ae6e50">5. Optics</a></li>
-<li><a href="#orgc4c1ae6">6. See also</a></li>
-<li><a href="#org0659691">7. Repository</a>
+<li><a href="#org960f54c">5. Optics</a></li>
+<li><a href="#orga056058">6. See also</a></li>
+<li><a href="#org38e162c">7. Repository</a>
<ul>
-<li><a href="#orgca69105">7.1. Git repository</a></li>
+<li><a href="#org0fc3cd6">7.1. Git repository</a></li>
</ul>
</li>
</ul>
</div>
</div>
-<div id="outline-container-org981ac12" class="outline-2">
-<h2 id="org981ac12"><span class="section-number-2">1.</span> Overview</h2>
+<div id="outline-container-orgac715c0" class="outline-2">
+<h2 id="orgac715c0"><span class="section-number-2">1.</span> Overview</h2>
<div class="outline-text-2" id="text-1">
<p>
Collection of physical projects. Electronics, 3D designs etc..
Here you can find:
</p>
<ol class="org-ol">
-<li><a href="#org4994aeb">Cases, covers, holders, organizers</a>
+<li><a href="#org7a34f0f">Cases, covers, holders, organizers</a>
<ul class="org-ul">
-<li><a href="#orgaa16a64">Measurement device cases</a></li>
-<li><a href="#org46eab79">Optics</a></li>
-<li><a href="#org6824ed3">Miscellaneous</a></li>
-<li><a href="#org46f2c43">Cable / wire</a></li>
+<li><a href="#orgc7f0f02">Measurement device cases</a></li>
+<li><a href="#org71fba1b">Optics</a></li>
+<li><a href="#org30459f1">Miscellaneous</a></li>
+<li><a href="#orgcd58dc4">Cable / wire</a></li>
</ul></li>
-<li><a href="#org25eccfa">Furniture</a></li>
-<li><a href="#orgfce274d">Miscellaneous</a> designs</li>
-<li><a href="#org6ae6e50">Optics</a></li>
+<li><a href="#org493250f">Furniture</a></li>
+<li><a href="#org4b18319">Miscellaneous</a> designs</li>
+<li><a href="#org960f54c">Optics</a></li>
</ol>
</div>
</div>
-<div id="outline-container-org4994aeb" class="outline-2">
-<h2 id="org4994aeb"><span class="section-number-2">2.</span> Cases, covers, holders, organizers</h2>
+<div id="outline-container-org7a34f0f" class="outline-2">
+<h2 id="org7a34f0f"><span class="section-number-2">2.</span> Cases, covers, holders, organizers</h2>
<div class="outline-text-2" id="text-2">
</div>
-<div id="outline-container-orgaa16a64" class="outline-3">
-<h3 id="orgaa16a64"><span class="section-number-3">2.1.</span> Measurement device cases</h3>
+<div id="outline-container-orgc7f0f02" class="outline-3">
+<h3 id="orgc7f0f02"><span class="section-number-3">2.1.</span> Measurement device cases</h3>
<div class="outline-text-3" id="text-2-1">
<ul class="org-ul">
<li>Digital caliphers battery mod and storage box
</div>
</div>
-<div id="outline-container-org46eab79" class="outline-3">
-<h3 id="org46eab79"><span class="section-number-3">2.2.</span> Optics</h3>
+<div id="outline-container-org71fba1b" class="outline-3">
+<h3 id="org71fba1b"><span class="section-number-3">2.2.</span> Optics</h3>
<div class="outline-text-3" id="text-2-2">
<ul class="org-ul">
<li>Case for 52mm macro filter
</div>
</div>
-<div id="outline-container-org6824ed3" class="outline-3">
-<h3 id="org6824ed3"><span class="section-number-3">2.3.</span> Miscellaneous</h3>
+<div id="outline-container-org30459f1" class="outline-3">
+<h3 id="org30459f1"><span class="section-number-3">2.3.</span> Miscellaneous</h3>
<div class="outline-text-3" id="text-2-3">
<ul class="org-ul">
<li>Nokia 105 (2019) modification for disabled
</div>
</div>
-<div id="outline-container-org46f2c43" class="outline-3">
-<h3 id="org46f2c43"><span class="section-number-3">2.4.</span> Cable / wire</h3>
+<div id="outline-container-orgcd58dc4" class="outline-3">
+<h3 id="orgcd58dc4"><span class="section-number-3">2.4.</span> Cable / wire</h3>
<div class="outline-text-3" id="text-2-4">
<ul class="org-ul">
<li>Cable organizer
-<br/><a href="misc/cable%20organizer/index.html"><img style="width:100%; max-width:500px;" src=" misc/cable%20organizer/make.png"></a></li>
+<br/><a href="Miscellaneous/cable%20organizer/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/cable%20organizer/make.png"></a></li>
<li>Hook
-<br/><a href="misc/hook/index.html"><img style="width:100%; max-width:500px;" src=" misc/hook/make.png"></a></li>
+<br/><a href="Miscellaneous/hook/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/hook/make.png"></a></li>
<li>USB cable terminals
<br/><a href="cases/USB%20cable%20terminals/index.html"><img style="width:100%; max-width:500px;" src=" cases/USB%20cable%20terminals/schematic.png"></a></li>
</div>
</div>
-<div id="outline-container-org25eccfa" class="outline-2">
-<h2 id="org25eccfa"><span class="section-number-2">3.</span> Furniture</h2>
+<div id="outline-container-org493250f" class="outline-2">
+<h2 id="org493250f"><span class="section-number-2">3.</span> Furniture</h2>
<div class="outline-text-2" id="text-3">
<ul class="org-ul">
<li>Book stand
</div>
</div>
-<div id="outline-container-orgfce274d" class="outline-2">
-<h2 id="orgfce274d"><span class="section-number-2">4.</span> Miscellaneous</h2>
+<div id="outline-container-org4b18319" class="outline-2">
+<h2 id="org4b18319"><span class="section-number-2">4.</span> Miscellaneous</h2>
<div class="outline-text-2" id="text-4">
<ul class="org-ul">
<li>12V Lead-Acid battery charger and terminal
-<br/><a href="misc/12V%20Lead-Acid%20battery%20changer%20and%20terminal/index.html"><img style="width:100%; max-width:500px;" src=" misc/12V%20Lead-Acid%20battery%20changer%20and%20terminal/make.png"></a></li>
+<br/><a href="Miscellaneous/12V%20Lead-Acid%20battery%20changer%20and%20terminal/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/12V%20Lead-Acid%20battery%20changer%20and%20terminal/make.png"></a></li>
<li>Baofeng radio battery charger modification
-<br/><a href="misc/Baofeng%20radio%20battery%20charger%20case%20mod/index.html"><img style="width:100%; max-width:500px;" src=" misc/Baofeng%20radio%20battery%20charger%20case%20mod/make.png"></a></li>
+<br/><a href="Miscellaneous/Baofeng%20radio%20battery%20charger%20case%20mod/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/Baofeng%20radio%20battery%20charger%20case%20mod/make.png"></a></li>
<li>adjustable resistor / indicator
-<br/><a href="misc/adjustable%20resistor/index.html"><img style="width:100%; max-width:500px;" src=" misc/adjustable%20resistor/make.png"></a></li>
+<br/><a href="Miscellaneous/adjustable%20resistor/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/adjustable%20resistor/make.png"></a></li>
<li>battery tester
-<br/><a href="misc/battery%20tester/index.html"><img style="width:100%; max-width:500px;" src=" misc/battery%20tester/make.png"></a></li>
-
-<li>Lab heater and cooler
-<br/><a href="misc/lab%20heater%20and%20cooler/index.html"><img style="width:100%; max-width:500px;" src=" misc/lab%20heater%20and%20cooler/make.png"></a></li>
+<br/><a href="Miscellaneous/battery%20tester/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/battery%20tester/make.png"></a></li>
<li>USB Fan modification
-<br/><a href="misc/USB%20desk%20fan%20mod/index.html"><img style="width:100%; max-width:500px;" src=" misc/USB%20desk%20fan%20mod/make.png"></a></li>
+<br/><a href="Miscellaneous/USB%20desk%20fan%20mod/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/USB%20desk%20fan%20mod/make.png"></a></li>
<li>Window fixator
-<br/><a href="misc/window%20fixator/index.html"><img style="width:100%; max-width:500px;" src=" misc/window%20fixator/make.png"></a></li>
+<br/><a href="Miscellaneous/window%20fixator/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/window%20fixator/make.png"></a></li>
<li>Rounded pincers
-<br/><a href="misc/round%20pincers/index.html"><img style="width:100%; max-width:500px;" src=" misc/round%20pincers/make.png"></a></li>
+<br/><a href="Miscellaneous/round%20pincers/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/round%20pincers/make.png"></a></li>
+
+<li>Heating/Cooling Plate with Triple Peltier Elements
+<br/><a href="Miscellaneous/Lab%20heater%20and%20cooler/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/Lab%20heater%20and%20cooler/make.png"></a></li>
</ul>
</div>
-<div id="outline-container-orgd3a93bf" class="outline-3">
-<h3 id="orgd3a93bf"><span class="section-number-3">4.1.</span> Audio</h3>
+<div id="outline-container-orga2611d2" class="outline-3">
+<h3 id="orga2611d2"><span class="section-number-3">4.1.</span> Audio</h3>
<div class="outline-text-3" id="text-4-1">
<ul class="org-ul">
<li>Portable stereo speaker
-<br/><a href="misc/portable%20stereo%20active%20speaker/index.html"><img style="width:100%; max-width:500px;" src=" misc/portable%20stereo%20active%20speaker/make.png"></a></li>
+<br/><a href="Miscellaneous/portable%20stereo%20active%20speaker/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/portable%20stereo%20active%20speaker/make.png"></a></li>
<li>Headphone hub
-<br/><a href="misc/headphone%20hub/index.html"><img style="width:100%; max-width:500px;" src=" misc/headphone%20hub/make.png"></a></li>
+<br/><a href="Miscellaneous/headphone%20hub/index.html"><img style="width:100%; max-width:500px;" src=" Miscellaneous/headphone%20hub/make.png"></a></li>
</ul>
</div>
</div>
</div>
-<div id="outline-container-org6ae6e50" class="outline-2">
-<h2 id="org6ae6e50"><span class="section-number-2">5.</span> Optics</h2>
+<div id="outline-container-org960f54c" class="outline-2">
+<h2 id="org960f54c"><span class="section-number-2">5.</span> Optics</h2>
<div class="outline-text-2" id="text-5">
<ul class="org-ul">
<li>35mm film copying device
</div>
</div>
-<div id="outline-container-orgc4c1ae6" class="outline-2">
-<h2 id="orgc4c1ae6"><span class="section-number-2">6.</span> See also</h2>
+<div id="outline-container-orga056058" class="outline-2">
+<h2 id="orga056058"><span class="section-number-2">6.</span> See also</h2>
<div class="outline-text-2" id="text-6">
<ul class="org-ul">
<li>Jay Doscher blog: <a href="https://back7.co/">https://back7.co/</a></li>
</ul>
</div>
</div>
-<div id="outline-container-org0659691" class="outline-2">
-<h2 id="org0659691"><span class="section-number-2">7.</span> Repository</h2>
+<div id="outline-container-org38e162c" class="outline-2">
+<h2 id="org38e162c"><span class="section-number-2">7.</span> Repository</h2>
<div class="outline-text-2" id="text-7">
<ul class="org-ul">
<li>Designs in this repository are released under Creative Commons Zero
</ul>
</div>
-<div id="outline-container-orgca69105" class="outline-3">
-<h3 id="orgca69105"><span class="section-number-3">7.1.</span> Git repository</h3>
+<div id="outline-container-org0fc3cd6" class="outline-3">
+<h3 id="org0fc3cd6"><span class="section-number-3">7.1.</span> Git repository</h3>
<div class="outline-text-3" id="text-7-1">
<ul class="org-ul">
<li><a href="https://www2.svjatoslav.eu/gitweb/?p=physical.git;a=snapshot;h=HEAD;sf=tgz">Download latest snapshot in TAR GZ format</a></li>
</div>
</div>
<div id="postamble" class="status">
-<p class="date">Created: 2025-04-05 Sat 17:47</p>
+<p class="date">Created: 2025-04-07 Mon 02:16</p>
<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
</div>
</body>
:END:
+ Cable organizer
{{{imglnk(
- misc/cable%20organizer/index.html,
- misc/cable%20organizer/make.png
+ Miscellaneous/cable%20organizer/index.html,
+ Miscellaneous/cable%20organizer/make.png
)}}}
+ Hook
{{{imglnk(
- misc/hook/index.html,
- misc/hook/make.png
+ Miscellaneous/hook/index.html,
+ Miscellaneous/hook/make.png
)}}}
+ USB cable terminals
:END:
+ 12V Lead-Acid battery charger and terminal
{{{imglnk(
- misc/12V%20Lead-Acid%20battery%20changer%20and%20terminal/index.html,
- misc/12V%20Lead-Acid%20battery%20changer%20and%20terminal/make.png
+ Miscellaneous/12V%20Lead-Acid%20battery%20changer%20and%20terminal/index.html,
+ Miscellaneous/12V%20Lead-Acid%20battery%20changer%20and%20terminal/make.png
)}}}
+ Baofeng radio battery charger modification
{{{imglnk(
- misc/Baofeng%20radio%20battery%20charger%20case%20mod/index.html,
- misc/Baofeng%20radio%20battery%20charger%20case%20mod/make.png
+ Miscellaneous/Baofeng%20radio%20battery%20charger%20case%20mod/index.html,
+ Miscellaneous/Baofeng%20radio%20battery%20charger%20case%20mod/make.png
)}}}
+ adjustable resistor / indicator
{{{imglnk(
- misc/adjustable%20resistor/index.html,
- misc/adjustable%20resistor/make.png
+ Miscellaneous/adjustable%20resistor/index.html,
+ Miscellaneous/adjustable%20resistor/make.png
)}}}
+ battery tester
{{{imglnk(
- misc/battery%20tester/index.html,
- misc/battery%20tester/make.png
- )}}}
-
-+ Lab heater and cooler
- {{{imglnk(
- misc/lab%20heater%20and%20cooler/index.html,
- misc/lab%20heater%20and%20cooler/make.png
+ Miscellaneous/battery%20tester/index.html,
+ Miscellaneous/battery%20tester/make.png
)}}}
+ USB Fan modification
{{{imglnk(
- misc/USB%20desk%20fan%20mod/index.html,
- misc/USB%20desk%20fan%20mod/make.png
+ Miscellaneous/USB%20desk%20fan%20mod/index.html,
+ Miscellaneous/USB%20desk%20fan%20mod/make.png
)}}}
+ Window fixator
{{{imglnk(
- misc/window%20fixator/index.html,
- misc/window%20fixator/make.png
+ Miscellaneous/window%20fixator/index.html,
+ Miscellaneous/window%20fixator/make.png
)}}}
+ Rounded pincers
{{{imglnk(
- misc/round%20pincers/index.html,
- misc/round%20pincers/make.png
+ Miscellaneous/round%20pincers/index.html,
+ Miscellaneous/round%20pincers/make.png
)}}}
++ Heating/Cooling Plate with Triple Peltier Elements
+ {{{imglnk(
+ Miscellaneous/Lab%20heater%20and%20cooler/index.html,
+ Miscellaneous/Lab%20heater%20and%20cooler/make.png
+ )}}}
+
** Audio
+ Portable stereo speaker
{{{imglnk(
- misc/portable%20stereo%20active%20speaker/index.html,
- misc/portable%20stereo%20active%20speaker/make.png
+ Miscellaneous/portable%20stereo%20active%20speaker/index.html,
+ Miscellaneous/portable%20stereo%20active%20speaker/make.png
)}}}
+ Headphone hub
{{{imglnk(
- misc/headphone%20hub/index.html,
- misc/headphone%20hub/make.png
+ Miscellaneous/headphone%20hub/index.html,
+ Miscellaneous/headphone%20hub/make.png
)}}}
* Optics
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 6 6
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-Text HLabel 3900 3350 0 50 Input ~ 0
-V_in
-Text HLabel 4450 3350 2 50 Input ~ 0
-V_out
-Text HLabel 4150 3650 0 50 BiDi ~ 0
-GND
-$EndSCHEMATC
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 6 6
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-Text HLabel 3900 3350 0 50 Input ~ 0
-V_in
-Text HLabel 4450 3350 2 50 Input ~ 0
-V_out
-Text HLabel 4150 3650 0 50 BiDi ~ 0
-GND
-$EndSCHEMATC
+++ /dev/null
-EESchema-LIBRARY Version 2.4
-#encoding utf-8
-#
-# Connector_Conn_WallPlug
-#
-DEF Connector_Conn_WallPlug P 0 0 Y Y 1 F N
-F0 "P" -50 175 50 H V C BNN
-F1 "Connector_Conn_WallPlug" -225 0 50 V V C BNN
-F2 "" 400 0 50 H I C CNN
-F3 "" 400 0 50 H I C CNN
-DRAW
-A -125 0 150 -899 899 0 1 10 f -125 -150 -125 150
-P 2 0 1 20 -175 -100 -25 -100 N
-P 2 0 1 20 -175 100 -25 100 N
-P 2 0 1 10 -125 -150 -125 150 N
-P 2 0 1 0 -25 -100 100 -100 N
-P 2 0 1 0 -25 100 100 100 N
-X AC_P 1 200 100 200 L 50 50 1 1 w
-X AC_N 2 200 -100 200 L 50 50 1 1 w
-ENDDRAW
-ENDDEF
-#
-# Connector_USB_A
-#
-DEF Connector_USB_A J 0 40 Y Y 1 F N
-F0 "J" -200 450 50 H V L CNN
-F1 "Connector_USB_A" -200 350 50 H V L CNN
-F2 "" 150 -50 50 H I C CNN
-F3 "" 150 -50 50 H I C CNN
-$FPLIST
- USB*
-$ENDFPLIST
-DRAW
-C -150 85 25 0 1 10 F
-C -25 135 15 0 1 10 F
-S -200 -300 200 300 0 1 10 f
-S -60 190 -170 210 0 1 0 F
-S -50 180 -180 230 0 1 0 N
-S -5 -300 5 -270 0 1 0 N
-S 10 50 -20 20 0 1 10 F
-S 200 -105 170 -95 0 1 0 N
-S 200 -5 170 5 0 1 0 N
-S 200 195 170 205 0 1 0 N
-P 4 0 1 10 -125 85 -100 85 -50 135 -25 135 N
-P 4 0 1 10 -100 85 -75 85 -50 35 0 35 N
-P 4 0 1 10 25 110 25 60 75 85 25 110 F
-P 2 1 1 10 -75 85 25 85 N
-X VBUS 1 300 200 100 L 50 50 1 1 W
-X D- 2 300 -100 100 L 50 50 1 1 P
-X D+ 3 300 0 100 L 50 50 1 1 P
-X GND 4 0 -400 100 U 50 50 1 1 W
-X Shield 5 -100 -400 100 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_C
-#
-DEF Device_C C 0 10 N Y 1 F N
-F0 "C" 25 100 50 H V L CNN
-F1 "Device_C" 25 -100 50 H V L CNN
-F2 "" 38 -150 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-$FPLIST
- C_*
-$ENDFPLIST
-DRAW
-P 2 0 1 20 -80 -30 80 -30 N
-P 2 0 1 20 -80 30 80 30 N
-X ~ 1 0 150 110 D 50 50 1 1 P
-X ~ 2 0 -150 110 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_D_Bridge_+-AA
-#
-DEF Device_D_Bridge_+-AA D 0 0 Y Y 1 F N
-F0 "D" 100 275 50 H V L CNN
-F1 "Device_D_Bridge_+-AA" 100 200 50 H V L CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-$FPLIST
- D*Bridge*
- D*Rectifier*
-$ENDFPLIST
-DRAW
-C -200 0 10 0 1 0 F
-C 0 -200 10 0 1 0 F
-C 0 200 10 0 1 0 F
-C 200 0 10 0 1 0 F
-P 2 0 1 10 -100 150 -50 100 N
-P 2 0 1 10 -50 -100 -100 -150 N
-P 2 0 1 10 100 -50 150 -100 N
-P 2 0 1 10 100 50 150 100 N
-P 4 0 1 10 -150 100 -100 50 -75 125 -150 100 N
-P 4 0 1 10 -100 -50 -150 -100 -75 -125 -100 -50 N
-P 4 0 1 10 50 100 100 150 125 75 50 100 N
-P 4 0 1 10 125 -75 50 -100 100 -150 125 -75 N
-P 5 0 1 0 -200 0 0 -200 200 0 0 200 -200 0 N
-X + 1 300 0 100 L 50 50 1 1 P
-X - 2 -300 0 100 R 50 50 1 1 P
-X ~~ 3 0 300 100 D 50 50 1 1 P
-X ~~ 4 0 -300 100 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_R
-#
-DEF Device_R R 0 0 N Y 1 F N
-F0 "R" 80 0 50 V V C CNN
-F1 "Device_R" 0 0 50 V V C CNN
-F2 "" -70 0 50 V I C CNN
-F3 "" 0 0 50 H I C CNN
-$FPLIST
- R_*
-$ENDFPLIST
-DRAW
-S -40 -100 40 100 0 1 10 N
-X ~ 1 0 150 50 D 50 50 1 1 P
-X ~ 2 0 -150 50 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_Transformer_1P_1S
-#
-DEF Device_Transformer_1P_1S T 0 40 Y N 1 F N
-F0 "T" 0 250 50 H V C CNN
-F1 "Device_Transformer_1P_1S" 0 -300 50 H V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-DRAW
-A -100 -150 50 899 1 0 1 0 N -100 -100 -50 -150
-A -100 -150 50 -1 -899 0 1 0 N -50 -150 -100 -199
-A -100 -50 50 899 1 0 1 0 N -100 0 -50 -50
-A -100 -50 50 -1 -899 0 1 0 N -50 -50 -100 -99
-A -100 50 50 899 1 0 1 0 N -100 100 -50 50
-A -100 50 50 -1 -899 0 1 0 N -50 50 -100 1
-A -100 150 50 899 1 0 1 0 N -100 200 -50 150
-A -100 150 50 -1 -899 0 1 0 N -50 150 -100 101
-A 100 -50 50 899 -1799 0 1 0 N 100 0 51 -50
-A 100 -50 50 1799 -899 0 1 0 N 51 -50 100 -99
-A 100 50 50 899 -1799 0 1 0 N 100 100 51 50
-A 100 50 50 1799 -899 0 1 0 N 51 50 100 1
-A 100 150 50 899 -1799 0 1 0 N 100 200 51 150
-A 100 150 50 1799 -899 0 1 0 N 51 150 100 101
-A 101 -150 50 910 -1799 0 1 0 N 101 -100 52 -150
-A 101 -150 50 -912 -1799 0 1 0 N 101 -199 52 -150
-P 2 0 1 0 -25 200 -25 -200 N
-P 2 0 1 0 25 -200 25 200 N
-X AA 1 -400 200 300 R 50 50 1 1 P
-X AB 2 -400 -200 300 R 50 50 1 1 P
-X SA 3 400 -200 300 L 50 50 1 1 P
-X SB 4 400 200 300 L 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_Voltmeter_DC
-#
-DEF Device_Voltmeter_DC MES 0 1 N N 1 F N
-F0 "MES" -130 40 50 H V R CNN
-F1 "Device_Voltmeter_DC" -130 -30 50 H V R CNN
-F2 "" 0 100 50 V I C CNN
-F3 "" 0 100 50 V I C CNN
-DRAW
-C 0 0 100 0 1 10 N
-T 0 0 0 100 0 0 0 V Normal 0 C C
-P 2 0 0 0 -125 -125 -75 -75 N
-P 2 0 0 0 75 75 125 125 N
-P 3 0 0 0 75 125 125 125 125 75 N
-P 2 0 1 0 10 150 30 150 N
-P 2 0 1 0 20 160 20 140 N
-X - 1 0 -200 100 U 50 50 1 1 P
-X + 2 0 200 100 D 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Regulator_Linear_LM317_3PinPackage
-#
-DEF Regulator_Linear_LM317_3PinPackage U 0 10 Y Y 1 F N
-F0 "U" -150 125 50 H V C CNN
-F1 "Regulator_Linear_LM317_3PinPackage" 0 125 50 H V L CNN
-F2 "" 0 250 50 H I C CIN
-F3 "" 0 0 50 H I C CNN
-ALIAS AZ1117-ADJ
-$FPLIST
- SOT?223*
- SOT?89*
- TO?220*
- TO?252*
- TO?263*
-$ENDFPLIST
-DRAW
-S -200 75 200 -200 0 1 10 f
-X ADJ 1 0 -300 100 U 50 50 1 1 I
-X VO 2 300 0 100 L 50 50 1 1 w
-X VI 3 -300 0 100 R 50 50 1 1 W
-ENDDRAW
-ENDDEF
-#
-# Switch_SW_DPST
-#
-DEF Switch_SW_DPST SW 0 0 Y N 1 F N
-F0 "SW" 0 200 50 H V C CNN
-F1 "Switch_SW_DPST" 0 -200 50 H V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-DRAW
-C -80 -100 20 0 0 0 N
-C -80 100 20 0 0 0 N
-C 80 -100 20 0 0 0 N
-C 80 100 20 0 0 0 N
-P 2 0 0 0 -60 -90 50 -40 N
-P 2 0 0 0 -60 110 50 160 N
-P 2 0 0 0 0 -50 0 -25 N
-P 2 0 0 0 0 0 0 25 N
-P 2 0 0 0 0 50 0 75 N
-P 2 0 0 0 0 100 0 125 N
-X 1 1 -200 -100 100 R 50 50 1 1 P
-X 2 2 200 -100 100 L 50 50 1 1 P
-X 3 3 -200 100 100 R 50 50 1 1 P
-X 4 4 200 100 100 L 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# power_GND
-#
-DEF power_GND #PWR 0 0 Y Y 1 F P
-F0 "#PWR" 0 -250 50 H I C CNN
-F1 "power_GND" 0 -150 50 H V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-DRAW
-P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
-X GND 1 0 0 0 D 50 50 1 1 W N
-ENDDRAW
-ENDDEF
-#
-#End Library
+++ /dev/null
-(kicad_pcb (version 4) (host kicad "dummy file") )
+++ /dev/null
-update=22/05/2015 07:44:53
-version=1
-last_client=kicad
-[general]
-version=1
-RootSch=
-BoardNm=
-[pcbnew]
-version=1
-LastNetListRead=
-UseCmpFile=1
-PadDrill=0.600000000000
-PadDrillOvalY=0.600000000000
-PadSizeH=1.500000000000
-PadSizeV=1.500000000000
-PcbTextSizeV=1.500000000000
-PcbTextSizeH=1.500000000000
-PcbTextThickness=0.300000000000
-ModuleTextSizeV=1.000000000000
-ModuleTextSizeH=1.000000000000
-ModuleTextSizeThickness=0.150000000000
-SolderMaskClearance=0.000000000000
-SolderMaskMinWidth=0.000000000000
-DrawSegmentWidth=0.200000000000
-BoardOutlineThickness=0.100000000000
-ModuleOutlineThickness=0.150000000000
-[cvpcb]
-version=1
-NetIExt=net
-[eeschema]
-version=1
-LibDir=
-[eeschema/libraries]
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 1 6
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Sheet
-S 4300 2600 1050 900
-U 5F09F92C
-F0 "transformer board" 50
-F1 "transformer board.sch" 50
-F2 "220V_in1" I L 4300 2800 50
-F3 "220V_in2" I L 4300 3000 50
-F4 "pwr_switch_1" B R 5350 2800 50
-F5 "pwr_switch_2" B R 5350 3000 50
-F6 "+30V" O R 5350 3200 50
-F7 "GND" O R 5350 3400 50
-$EndSheet
-$Comp
-L Connector:Conn_WallPlug P1
-U 1 1 5F0B857F
-P 3800 2900
-F 0 "P1" H 3817 3225 50 0000 C CNN
-F 1 "Conn_WallPlug" H 3817 3134 50 0000 C CNN
-F 2 "" H 4200 2900 50 0001 C CNN
-F 3 "~" H 4200 2900 50 0001 C CNN
- 1 3800 2900
- 1 0 0 -1
-$EndComp
-$Comp
-L power:GND #PWR01
-U 1 1 5F0B8AF8
-P 5450 3500
-F 0 "#PWR01" H 5450 3250 50 0001 C CNN
-F 1 "GND" H 5455 3327 50 0000 C CNN
-F 2 "" H 5450 3500 50 0001 C CNN
-F 3 "" H 5450 3500 50 0001 C CNN
- 1 5450 3500
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5450 3500 5450 3400
-Wire Wire Line
- 5450 3400 5350 3400
-Wire Wire Line
- 4000 2800 4300 2800
-Wire Wire Line
- 4000 3000 4300 3000
-$Comp
-L Switch:SW_DPST SW1
-U 1 1 5F0BC431
-P 6200 2200
-F 0 "SW1" H 6200 2525 50 0000 C CNN
-F 1 "SW_DPST" H 6200 2434 50 0000 C CNN
-F 2 "" H 6200 2200 50 0001 C CNN
-F 3 "~" H 6200 2200 50 0001 C CNN
- 1 6200 2200
- 1 0 0 -1
-$EndComp
-$Sheet
-S 7200 3050 600 300
-U 5F0BCD3F
-F0 "current limiter" 50
-F1 "current limiter.sch" 50
-F2 "V_in" I L 7200 3200 50
-F3 "V_out" O R 7800 3200 50
-$EndSheet
-$Sheet
-S 5900 3100 600 350
-U 5F0C4B8D
-F0 "DC2DC step down" 50
-F1 "DC2DC step down.sch" 50
-F2 "V_in" I L 5900 3200 50
-F3 "V_out" I R 6500 3200 50
-F4 "GND" B L 5900 3350 50
-$EndSheet
-Wire Wire Line
- 6500 3200 7200 3200
-Wire Wire Line
- 7800 3200 8300 3200
-Wire Wire Line
- 8300 3200 8300 3300
-Wire Wire Line
- 8300 3700 7000 3700
-Wire Wire Line
- 7000 3700 7000 4150
-Wire Wire Line
- 7000 4150 7200 4150
-$Sheet
-S 8950 3050 1400 800
-U 5F0CC4B7
-F0 "connector terminal" 50
-F1 "connector terminal.sch" 50
-F2 "5V" I L 8950 3150 50
-F3 "13V" I L 8950 3300 50
-F4 "GND" I L 8950 3450 50
-F5 "Battery" B L 8950 3600 50
-$EndSheet
-Wire Wire Line
- 7800 4150 8650 4150
-Wire Wire Line
- 8650 4150 8650 3150
-Wire Wire Line
- 8650 3150 8950 3150
-Wire Wire Line
- 8950 3300 8300 3300
-Connection ~ 8300 3300
-Wire Wire Line
- 8300 3300 8300 3700
-$Comp
-L power:GND #PWR019
-U 1 1 5F170709
-P 8800 3700
-F 0 "#PWR019" H 8800 3450 50 0001 C CNN
-F 1 "GND" H 8805 3527 50 0000 C CNN
-F 2 "" H 8800 3700 50 0001 C CNN
-F 3 "" H 8800 3700 50 0001 C CNN
- 1 8800 3700
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 8500 3600 8950 3600
-Wire Wire Line
- 8800 3700 8800 3450
-Wire Wire Line
- 8800 3450 8950 3450
-Wire Wire Line
- 6000 2100 5850 2100
-Wire Wire Line
- 5850 2100 5850 1750
-Connection ~ 8300 3200
-$Comp
-L Device:Voltmeter_DC MES1
-U 1 1 5F175320
-P 8300 4600
-F 0 "MES1" H 8453 4646 50 0000 L CNN
-F 1 "Voltmeter_DC" H 8453 4555 50 0000 L CNN
-F 2 "" V 8300 4700 50 0001 C CNN
-F 3 "~" V 8300 4700 50 0001 C CNN
- 1 8300 4600
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:Voltmeter_DC MES2
-U 1 1 5F1764EC
-P 9200 4650
-F 0 "MES2" H 9353 4696 50 0000 L CNN
-F 1 "Voltmeter_DC" H 9353 4605 50 0000 L CNN
-F 2 "" V 9200 4750 50 0001 C CNN
-F 3 "~" V 9200 4750 50 0001 C CNN
- 1 9200 4650
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 8300 5000 8300 4800
-Wire Wire Line
- 8300 4400 8300 3700
-Connection ~ 8300 3700
-Wire Wire Line
- 8650 4150 9200 4150
-Wire Wire Line
- 9200 4150 9200 4450
-Connection ~ 8650 4150
-$Sheet
-S 7200 4050 600 350
-U 5F182C5C
-F0 "sheet5F182C5C" 50
-F1 "DC2DC step down.sch" 50
-F2 "V_in" I L 7200 4150 50
-F3 "V_out" I R 7800 4150 50
-F4 "GND" B L 7200 4300 50
-$EndSheet
-$Comp
-L power:GND #PWR022
-U 1 1 5F1843C4
-P 7050 4400
-F 0 "#PWR022" H 7050 4150 50 0001 C CNN
-F 1 "GND" H 7055 4227 50 0000 C CNN
-F 2 "" H 7050 4400 50 0001 C CNN
-F 3 "" H 7050 4400 50 0001 C CNN
- 1 7050 4400
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 7050 4400 7050 4300
-Wire Wire Line
- 7050 4300 7200 4300
-$Comp
-L power:GND #PWR021
-U 1 1 5F184BC7
-P 5750 3450
-F 0 "#PWR021" H 5750 3200 50 0001 C CNN
-F 1 "GND" H 5755 3277 50 0000 C CNN
-F 2 "" H 5750 3450 50 0001 C CNN
-F 3 "" H 5750 3450 50 0001 C CNN
- 1 5750 3450
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5750 3450 5750 3350
-Wire Wire Line
- 5750 3350 5900 3350
-Text Label 7100 3200 0 50 ~ 0
-5
-Text Label 7850 3200 0 50 ~ 0
-6
-Text Label 5400 3400 0 50 ~ 0
-1
-Text Label 5400 3200 0 50 ~ 0
-2
-Text Label 5900 2100 0 50 ~ 0
-3
-Text Label 6500 2100 0 50 ~ 0
-4
-Text Label 8850 3600 0 50 ~ 0
-7
-Text Label 8850 3300 0 50 ~ 0
-8
-Text Label 8850 3450 0 50 ~ 0
-9
-Text Label 8850 3150 0 50 ~ 0
-10
-Text Label 9200 4300 0 50 ~ 0
-11
-Text Label 8300 4250 0 50 ~ 0
-12
-Wire Wire Line
- 8300 5000 8800 5000
-Wire Wire Line
- 9200 5000 9200 4850
-$Comp
-L power:GND #PWR?
-U 1 1 5F1901DC
-P 8800 5200
-F 0 "#PWR?" H 8800 4950 50 0001 C CNN
-F 1 "GND" H 8805 5027 50 0000 C CNN
-F 2 "" H 8800 5200 50 0001 C CNN
-F 3 "" H 8800 5200 50 0001 C CNN
- 1 8800 5200
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 8800 5200 8800 5000
-Connection ~ 8800 5000
-Wire Wire Line
- 8800 5000 9200 5000
-Text Label 8800 5150 0 50 ~ 0
-13
-Wire Wire Line
- 5350 3200 5900 3200
-Wire Wire Line
- 5900 2800 5900 2300
-Wire Wire Line
- 5900 2300 6000 2300
-Wire Wire Line
- 5350 2800 5900 2800
-Wire Wire Line
- 6400 3000 6400 2300
-Wire Wire Line
- 5350 3000 6400 3000
-Wire Wire Line
- 6400 2100 8500 2100
-Wire Wire Line
- 8500 2100 8500 3600
-Wire Wire Line
- 5850 1750 8300 1750
-Wire Wire Line
- 8300 1750 8300 3200
-$EndSCHEMATC
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 1 6
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Sheet
-S 3850 2600 1050 900
-U 5F09F92C
-F0 "transformer board" 50
-F1 "transformer board.sch" 50
-F2 "220V_in1" I L 3850 2800 50
-F3 "220V_in2" I L 3850 3000 50
-F4 "pwr_switch_1" B R 4900 2800 50
-F5 "pwr_switch_2" B R 4900 3000 50
-F6 "+30V" O R 4900 3200 50
-F7 "GND" O R 4900 3400 50
-$EndSheet
-$Comp
-L Connector:Conn_WallPlug P1
-U 1 1 5F0B857F
-P 3350 2900
-F 0 "P1" H 3367 3225 50 0000 C CNN
-F 1 "Conn_WallPlug" H 3367 3134 50 0000 C CNN
-F 2 "" H 3750 2900 50 0001 C CNN
-F 3 "~" H 3750 2900 50 0001 C CNN
- 1 3350 2900
- 1 0 0 -1
-$EndComp
-$Comp
-L power:GND #PWR01
-U 1 1 5F0B8AF8
-P 5000 3500
-F 0 "#PWR01" H 5000 3250 50 0001 C CNN
-F 1 "GND" H 5005 3327 50 0000 C CNN
-F 2 "" H 5000 3500 50 0001 C CNN
-F 3 "" H 5000 3500 50 0001 C CNN
- 1 5000 3500
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5000 3500 5000 3400
-Wire Wire Line
- 5000 3400 4900 3400
-Wire Wire Line
- 3550 2800 3850 2800
-Wire Wire Line
- 3550 3000 3850 3000
-$Comp
-L Switch:SW_DPST SW1
-U 1 1 5F0BC431
-P 5300 2100
-F 0 "SW1" H 5300 2425 50 0000 C CNN
-F 1 "SW_DPST" H 5300 2334 50 0000 C CNN
-F 2 "" H 5300 2100 50 0001 C CNN
-F 3 "~" H 5300 2100 50 0001 C CNN
- 1 5300 2100
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4900 2800 5100 2800
-Wire Wire Line
- 5100 2800 5100 2200
-Wire Wire Line
- 4900 3000 5500 3000
-Wire Wire Line
- 5500 3000 5500 2200
-$Sheet
-S 7200 3050 600 300
-U 5F0BCD3F
-F0 "current limiter" 50
-F1 "current limiter.sch" 50
-F2 "V_in" I L 7200 3200 50
-F3 "V_out" O R 7800 3200 50
-$EndSheet
-$Sheet
-S 5900 3100 600 350
-U 5F0C4B8D
-F0 "DC2DC step down" 50
-F1 "DC2DC step down.sch" 50
-F2 "V_in" I L 5900 3200 50
-F3 "V_out" I R 6500 3200 50
-F4 "GND" B L 5900 3350 50
-$EndSheet
-Wire Wire Line
- 4900 3200 5900 3200
-Wire Wire Line
- 6500 3200 7200 3200
-Wire Wire Line
- 7800 3200 8300 3200
-Wire Wire Line
- 8300 3200 8300 3300
-Wire Wire Line
- 8300 3700 7000 3700
-Wire Wire Line
- 7000 3700 7000 4150
-Wire Wire Line
- 7000 4150 7200 4150
-$Sheet
-S 8950 3050 1400 800
-U 5F0CC4B7
-F0 "connector terminal" 50
-F1 "connector terminal.sch" 50
-F2 "5V" I L 8950 3150 50
-F3 "13V" I L 8950 3300 50
-F4 "GND" I L 8950 3450 50
-F5 "Battery" B L 8950 3600 50
-$EndSheet
-Wire Wire Line
- 7800 4150 8650 4150
-Wire Wire Line
- 8650 4150 8650 3150
-Wire Wire Line
- 8650 3150 8950 3150
-Wire Wire Line
- 8950 3300 8300 3300
-Connection ~ 8300 3300
-Wire Wire Line
- 8300 3300 8300 3700
-$Comp
-L power:GND #PWR019
-U 1 1 5F170709
-P 8800 3700
-F 0 "#PWR019" H 8800 3450 50 0001 C CNN
-F 1 "GND" H 8805 3527 50 0000 C CNN
-F 2 "" H 8800 3700 50 0001 C CNN
-F 3 "" H 8800 3700 50 0001 C CNN
- 1 8800 3700
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5500 2000 8500 2000
-Wire Wire Line
- 8500 2000 8500 3600
-Wire Wire Line
- 8500 3600 8950 3600
-Wire Wire Line
- 8800 3700 8800 3450
-Wire Wire Line
- 8800 3450 8950 3450
-Wire Wire Line
- 5100 2000 4950 2000
-Wire Wire Line
- 4950 2000 4950 1650
-Wire Wire Line
- 4950 1650 8300 1650
-Wire Wire Line
- 8300 1650 8300 3200
-Connection ~ 8300 3200
-$Comp
-L Device:Voltmeter_DC MES1
-U 1 1 5F175320
-P 8300 4600
-F 0 "MES1" H 8453 4646 50 0000 L CNN
-F 1 "Voltmeter_DC" H 8453 4555 50 0000 L CNN
-F 2 "" V 8300 4700 50 0001 C CNN
-F 3 "~" V 8300 4700 50 0001 C CNN
- 1 8300 4600
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:Voltmeter_DC MES2
-U 1 1 5F1764EC
-P 9200 4650
-F 0 "MES2" H 9353 4696 50 0000 L CNN
-F 1 "Voltmeter_DC" H 9353 4605 50 0000 L CNN
-F 2 "" V 9200 4750 50 0001 C CNN
-F 3 "~" V 9200 4750 50 0001 C CNN
- 1 9200 4650
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 8300 5000 8300 4800
-Wire Wire Line
- 8300 4400 8300 3700
-Connection ~ 8300 3700
-Wire Wire Line
- 8650 4150 9200 4150
-Wire Wire Line
- 9200 4150 9200 4450
-Connection ~ 8650 4150
-$Sheet
-S 7200 4050 600 350
-U 5F182C5C
-F0 "sheet5F182C5C" 50
-F1 "DC2DC step down.sch" 50
-F2 "V_in" I L 7200 4150 50
-F3 "V_out" I R 7800 4150 50
-F4 "GND" B L 7200 4300 50
-$EndSheet
-$Comp
-L power:GND #PWR022
-U 1 1 5F1843C4
-P 7050 4400
-F 0 "#PWR022" H 7050 4150 50 0001 C CNN
-F 1 "GND" H 7055 4227 50 0000 C CNN
-F 2 "" H 7050 4400 50 0001 C CNN
-F 3 "" H 7050 4400 50 0001 C CNN
- 1 7050 4400
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 7050 4400 7050 4300
-Wire Wire Line
- 7050 4300 7200 4300
-$Comp
-L power:GND #PWR021
-U 1 1 5F184BC7
-P 5750 3450
-F 0 "#PWR021" H 5750 3200 50 0001 C CNN
-F 1 "GND" H 5755 3277 50 0000 C CNN
-F 2 "" H 5750 3450 50 0001 C CNN
-F 3 "" H 5750 3450 50 0001 C CNN
- 1 5750 3450
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5750 3450 5750 3350
-Wire Wire Line
- 5750 3350 5900 3350
-Text Label 7100 3200 0 50 ~ 0
-5
-Text Label 7850 3200 0 50 ~ 0
-6
-Text Label 4950 3400 0 50 ~ 0
-1
-Text Label 4950 3200 0 50 ~ 0
-2
-Text Label 5000 2000 0 50 ~ 0
-3
-Text Label 5600 2000 0 50 ~ 0
-4
-Text Label 8850 3600 0 50 ~ 0
-7
-Text Label 8850 3300 0 50 ~ 0
-8
-Text Label 8850 3450 0 50 ~ 0
-9
-Text Label 8850 3150 0 50 ~ 0
-10
-Text Label 9200 4300 0 50 ~ 0
-11
-Text Label 8300 4250 0 50 ~ 0
-12
-Wire Wire Line
- 8300 5000 8800 5000
-Wire Wire Line
- 9200 5000 9200 4850
-$Comp
-L power:GND #PWR?
-U 1 1 5F1901DC
-P 8800 5200
-F 0 "#PWR?" H 8800 4950 50 0001 C CNN
-F 1 "GND" H 8805 5027 50 0000 C CNN
-F 2 "" H 8800 5200 50 0001 C CNN
-F 3 "" H 8800 5200 50 0001 C CNN
- 1 8800 5200
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 8800 5200 8800 5000
-Connection ~ 8800 5000
-Wire Wire Line
- 8800 5000 9200 5000
-Text Label 8800 5150 0 50 ~ 0
-13
-$EndSCHEMATC
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 6 6
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Comp
-L Connector:USB_A J1
-U 1 1 5F0CC9AF
-P 2750 1650
-F 0 "J1" H 2807 2117 50 0000 C CNN
-F 1 "USB_A" H 2807 2026 50 0000 C CNN
-F 2 "" H 2900 1600 50 0001 C CNN
-F 3 " ~" H 2900 1600 50 0001 C CNN
- 1 2750 1650
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3050 1650 3050 1750
-$Comp
-L Connector:USB_A J4
-U 1 1 5F0CE176
-P 3550 1650
-F 0 "J4" H 3607 2117 50 0000 C CNN
-F 1 "USB_A" H 3607 2026 50 0000 C CNN
-F 2 "" H 3700 1600 50 0001 C CNN
-F 3 " ~" H 3700 1600 50 0001 C CNN
- 1 3550 1650
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3850 1650 3850 1750
-Wire Wire Line
- 3050 1450 3150 1450
-Wire Wire Line
- 3150 1450 3150 950
-Wire Wire Line
- 3150 950 3950 950
-Wire Wire Line
- 3950 950 3950 1450
-Wire Wire Line
- 3950 1450 3850 1450
-$Comp
-L power:GND #PWR03
-U 1 1 5F0CF308
-P 2750 2100
-F 0 "#PWR03" H 2750 1850 50 0001 C CNN
-F 1 "GND" H 2755 1927 50 0000 C CNN
-F 2 "" H 2750 2100 50 0001 C CNN
-F 3 "" H 2750 2100 50 0001 C CNN
- 1 2750 2100
- 1 0 0 -1
-$EndComp
-$Comp
-L power:GND #PWR06
-U 1 1 5F0CF8C4
-P 3550 2100
-F 0 "#PWR06" H 3550 1850 50 0001 C CNN
-F 1 "GND" H 3555 1927 50 0000 C CNN
-F 2 "" H 3550 2100 50 0001 C CNN
-F 3 "" H 3550 2100 50 0001 C CNN
- 1 3550 2100
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 2750 2100 2750 2050
-Wire Wire Line
- 3550 2100 3550 2050
-Text HLabel 1100 950 0 50 Input ~ 0
-5V
-Wire Wire Line
- 1100 950 2350 950
-Connection ~ 3150 950
-Text HLabel 1100 1100 0 50 Input ~ 0
-13V
-Wire Wire Line
- 1100 1100 2200 1100
-Wire Wire Line
- 3300 1100 3300 1650
-Wire Wire Line
- 3300 1650 3050 1650
-Connection ~ 3050 1650
-Wire Wire Line
- 3300 1100 4100 1100
-Wire Wire Line
- 4100 1100 4100 1650
-Wire Wire Line
- 4100 1650 3850 1650
-Connection ~ 3300 1100
-Connection ~ 3850 1650
-Text HLabel 1100 1250 0 50 Input ~ 0
-GND
-Text HLabel 1350 4400 0 50 BiDi ~ 0
-Battery
-$Comp
-L power:GND #PWR02
-U 1 1 5F0D429A
-P 1200 1300
-F 0 "#PWR02" H 1200 1050 50 0001 C CNN
-F 1 "GND" H 1205 1127 50 0000 C CNN
-F 2 "" H 1200 1300 50 0001 C CNN
-F 3 "" H 1200 1300 50 0001 C CNN
- 1 1200 1300
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 1200 1300 1200 1250
-Wire Wire Line
- 1200 1250 1100 1250
-$Comp
-L Connector:USB_A J7
-U 1 1 5F0D4E49
-P 4350 1650
-F 0 "J7" H 4407 2117 50 0000 C CNN
-F 1 "USB_A" H 4407 2026 50 0000 C CNN
-F 2 "" H 4500 1600 50 0001 C CNN
-F 3 " ~" H 4500 1600 50 0001 C CNN
- 1 4350 1650
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4650 1650 4650 1750
-Wire Wire Line
- 3950 950 4750 950
-Wire Wire Line
- 4750 950 4750 1450
-Wire Wire Line
- 4750 1450 4650 1450
-$Comp
-L power:GND #PWR09
-U 1 1 5F0D4E57
-P 4350 2100
-F 0 "#PWR09" H 4350 1850 50 0001 C CNN
-F 1 "GND" H 4355 1927 50 0000 C CNN
-F 2 "" H 4350 2100 50 0001 C CNN
-F 3 "" H 4350 2100 50 0001 C CNN
- 1 4350 2100
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4350 2100 4350 2050
-Wire Wire Line
- 4100 1100 4900 1100
-Wire Wire Line
- 4900 1100 4900 1650
-Wire Wire Line
- 4900 1650 4650 1650
-Connection ~ 4650 1650
-Connection ~ 3950 950
-Connection ~ 4100 1100
-Wire Wire Line
- 2650 2400 3450 2400
-Wire Wire Line
- 2650 2050 2650 2400
-Wire Wire Line
- 3450 2050 3450 2400
-Wire Wire Line
- 3450 2400 4250 2400
-Wire Wire Line
- 4250 2400 4250 2050
-Connection ~ 3450 2400
-$Comp
-L Device:C C2
-U 1 1 5F0D832F
-P 4900 1950
-F 0 "C2" H 5015 1996 50 0000 L CNN
-F 1 "C" H 5015 1905 50 0000 L CNN
-F 2 "" H 4938 1800 50 0001 C CNN
-F 3 "~" H 4900 1950 50 0001 C CNN
- 1 4900 1950
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4900 1800 4900 1650
-Connection ~ 4900 1650
-$Comp
-L power:GND #PWR012
-U 1 1 5F0D8E3C
-P 4900 2200
-F 0 "#PWR012" H 4900 1950 50 0001 C CNN
-F 1 "GND" H 4905 2027 50 0000 C CNN
-F 2 "" H 4900 2200 50 0001 C CNN
-F 3 "" H 4900 2200 50 0001 C CNN
- 1 4900 2200
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4900 2200 4900 2100
-$Comp
-L Device:C C5
-U 1 1 5F0D95F5
-P 5250 1600
-F 0 "C5" H 5365 1646 50 0000 L CNN
-F 1 "C" H 5365 1555 50 0000 L CNN
-F 2 "" H 5288 1450 50 0001 C CNN
-F 3 "~" H 5250 1600 50 0001 C CNN
- 1 5250 1600
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5250 1450 4750 1450
-Connection ~ 4750 1450
-$Comp
-L power:GND #PWR015
-U 1 1 5F0D9E27
-P 5250 1850
-F 0 "#PWR015" H 5250 1600 50 0001 C CNN
-F 1 "GND" H 5255 1677 50 0000 C CNN
-F 2 "" H 5250 1850 50 0001 C CNN
-F 3 "" H 5250 1850 50 0001 C CNN
- 1 5250 1850
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5250 1850 5250 1750
-$Comp
-L Connector:USB_A J2
-U 1 1 5F0DE4EE
-P 2750 3250
-F 0 "J2" H 2807 3717 50 0000 C CNN
-F 1 "USB_A" H 2807 3626 50 0000 C CNN
-F 2 "" H 2900 3200 50 0001 C CNN
-F 3 " ~" H 2900 3200 50 0001 C CNN
- 1 2750 3250
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3050 3250 3050 3350
-$Comp
-L Connector:USB_A J5
-U 1 1 5F0DE4F9
-P 3550 3250
-F 0 "J5" H 3607 3717 50 0000 C CNN
-F 1 "USB_A" H 3607 3626 50 0000 C CNN
-F 2 "" H 3700 3200 50 0001 C CNN
-F 3 " ~" H 3700 3200 50 0001 C CNN
- 1 3550 3250
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3850 3250 3850 3350
-Wire Wire Line
- 3050 3050 3150 3050
-Wire Wire Line
- 3150 3050 3150 2550
-Wire Wire Line
- 3150 2550 3950 2550
-Wire Wire Line
- 3950 2550 3950 3050
-Wire Wire Line
- 3950 3050 3850 3050
-$Comp
-L power:GND #PWR04
-U 1 1 5F0DE509
-P 2750 3700
-F 0 "#PWR04" H 2750 3450 50 0001 C CNN
-F 1 "GND" H 2755 3527 50 0000 C CNN
-F 2 "" H 2750 3700 50 0001 C CNN
-F 3 "" H 2750 3700 50 0001 C CNN
- 1 2750 3700
- 1 0 0 -1
-$EndComp
-$Comp
-L power:GND #PWR07
-U 1 1 5F0DE513
-P 3550 3700
-F 0 "#PWR07" H 3550 3450 50 0001 C CNN
-F 1 "GND" H 3555 3527 50 0000 C CNN
-F 2 "" H 3550 3700 50 0001 C CNN
-F 3 "" H 3550 3700 50 0001 C CNN
- 1 3550 3700
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 2750 3700 2750 3650
-Wire Wire Line
- 3550 3700 3550 3650
-Wire Wire Line
- 3300 2700 3300 3250
-Wire Wire Line
- 3300 3250 3050 3250
-Connection ~ 3050 3250
-Wire Wire Line
- 3300 2700 4100 2700
-Wire Wire Line
- 4100 2700 4100 3250
-Wire Wire Line
- 4100 3250 3850 3250
-Connection ~ 3850 3250
-$Comp
-L Connector:USB_A J8
-U 1 1 5F0DE52A
-P 4350 3250
-F 0 "J8" H 4407 3717 50 0000 C CNN
-F 1 "USB_A" H 4407 3626 50 0000 C CNN
-F 2 "" H 4500 3200 50 0001 C CNN
-F 3 " ~" H 4500 3200 50 0001 C CNN
- 1 4350 3250
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4650 3250 4650 3350
-Wire Wire Line
- 3950 2550 4750 2550
-Wire Wire Line
- 4750 2550 4750 3050
-Wire Wire Line
- 4750 3050 4650 3050
-$Comp
-L power:GND #PWR010
-U 1 1 5F0DE538
-P 4350 3700
-F 0 "#PWR010" H 4350 3450 50 0001 C CNN
-F 1 "GND" H 4355 3527 50 0000 C CNN
-F 2 "" H 4350 3700 50 0001 C CNN
-F 3 "" H 4350 3700 50 0001 C CNN
- 1 4350 3700
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4350 3700 4350 3650
-Wire Wire Line
- 4100 2700 4900 2700
-Wire Wire Line
- 4900 2700 4900 3250
-Wire Wire Line
- 4900 3250 4650 3250
-Connection ~ 4650 3250
-Connection ~ 3950 2550
-Connection ~ 4100 2700
-Wire Wire Line
- 2650 3650 2650 4000
-Wire Wire Line
- 3450 3650 3450 4000
-Wire Wire Line
- 3450 4000 4250 4000
-Wire Wire Line
- 4250 4000 4250 3650
-Connection ~ 3450 4000
-$Comp
-L Device:C C3
-U 1 1 5F0DE54F
-P 4900 3550
-F 0 "C3" H 5015 3596 50 0000 L CNN
-F 1 "C" H 5015 3505 50 0000 L CNN
-F 2 "" H 4938 3400 50 0001 C CNN
-F 3 "~" H 4900 3550 50 0001 C CNN
- 1 4900 3550
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4900 3400 4900 3250
-Connection ~ 4900 3250
-$Comp
-L power:GND #PWR013
-U 1 1 5F0DE55B
-P 4900 3800
-F 0 "#PWR013" H 4900 3550 50 0001 C CNN
-F 1 "GND" H 4905 3627 50 0000 C CNN
-F 2 "" H 4900 3800 50 0001 C CNN
-F 3 "" H 4900 3800 50 0001 C CNN
- 1 4900 3800
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4900 3800 4900 3700
-$Comp
-L Device:C C6
-U 1 1 5F0DE566
-P 5250 3200
-F 0 "C6" H 5365 3246 50 0000 L CNN
-F 1 "C" H 5365 3155 50 0000 L CNN
-F 2 "" H 5288 3050 50 0001 C CNN
-F 3 "~" H 5250 3200 50 0001 C CNN
- 1 5250 3200
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5250 3050 4750 3050
-Connection ~ 4750 3050
-$Comp
-L power:GND #PWR016
-U 1 1 5F0DE572
-P 5250 3450
-F 0 "#PWR016" H 5250 3200 50 0001 C CNN
-F 1 "GND" H 5255 3277 50 0000 C CNN
-F 2 "" H 5250 3450 50 0001 C CNN
-F 3 "" H 5250 3450 50 0001 C CNN
- 1 5250 3450
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5250 3450 5250 3350
-Wire Wire Line
- 3150 2550 2350 2550
-Wire Wire Line
- 2350 2550 2350 950
-Connection ~ 3150 2550
-Connection ~ 2350 950
-Wire Wire Line
- 2350 950 3150 950
-Wire Wire Line
- 3300 2700 2200 2700
-Wire Wire Line
- 2200 2700 2200 1100
-Connection ~ 3300 2700
-Connection ~ 2200 1100
-Wire Wire Line
- 2200 1100 3300 1100
-$Comp
-L Connector:USB_A J3
-U 1 1 5F10B6BB
-P 2750 4850
-F 0 "J3" H 2807 5317 50 0000 C CNN
-F 1 "USB_A" H 2807 5226 50 0000 C CNN
-F 2 "" H 2900 4800 50 0001 C CNN
-F 3 " ~" H 2900 4800 50 0001 C CNN
- 1 2750 4850
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3050 4850 3050 4950
-$Comp
-L Connector:USB_A J6
-U 1 1 5F10B6C6
-P 3550 4850
-F 0 "J6" H 3607 5317 50 0000 C CNN
-F 1 "USB_A" H 3607 5226 50 0000 C CNN
-F 2 "" H 3700 4800 50 0001 C CNN
-F 3 " ~" H 3700 4800 50 0001 C CNN
- 1 3550 4850
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3850 4850 3850 4950
-Wire Wire Line
- 3950 4150 3950 4650
-Wire Wire Line
- 3950 4650 3850 4650
-$Comp
-L power:GND #PWR05
-U 1 1 5F10B6D6
-P 2750 5300
-F 0 "#PWR05" H 2750 5050 50 0001 C CNN
-F 1 "GND" H 2755 5127 50 0000 C CNN
-F 2 "" H 2750 5300 50 0001 C CNN
-F 3 "" H 2750 5300 50 0001 C CNN
- 1 2750 5300
- 1 0 0 -1
-$EndComp
-$Comp
-L power:GND #PWR08
-U 1 1 5F10B6E0
-P 3550 5300
-F 0 "#PWR08" H 3550 5050 50 0001 C CNN
-F 1 "GND" H 3555 5127 50 0000 C CNN
-F 2 "" H 3550 5300 50 0001 C CNN
-F 3 "" H 3550 5300 50 0001 C CNN
- 1 3550 5300
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 2750 5300 2750 5250
-Wire Wire Line
- 3550 5300 3550 5250
-Wire Wire Line
- 4100 4300 4100 4850
-Wire Wire Line
- 4100 4850 3850 4850
-Connection ~ 3850 4850
-$Comp
-L Connector:USB_A J9
-U 1 1 5F10B6F3
-P 4350 4850
-F 0 "J9" H 4407 5317 50 0000 C CNN
-F 1 "USB_A" H 4407 5226 50 0000 C CNN
-F 2 "" H 4500 4800 50 0001 C CNN
-F 3 " ~" H 4500 4800 50 0001 C CNN
- 1 4350 4850
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4650 4850 4650 4950
-Wire Wire Line
- 4750 4150 4750 4650
-Wire Wire Line
- 4750 4650 4650 4650
-$Comp
-L power:GND #PWR011
-U 1 1 5F10B701
-P 4350 5300
-F 0 "#PWR011" H 4350 5050 50 0001 C CNN
-F 1 "GND" H 4355 5127 50 0000 C CNN
-F 2 "" H 4350 5300 50 0001 C CNN
-F 3 "" H 4350 5300 50 0001 C CNN
- 1 4350 5300
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4350 5300 4350 5250
-Wire Wire Line
- 4100 4300 4900 4300
-Wire Wire Line
- 4900 4300 4900 4850
-Wire Wire Line
- 4900 4850 4650 4850
-Connection ~ 4650 4850
-Connection ~ 3950 4150
-Connection ~ 4100 4300
-Wire Wire Line
- 3450 5250 3450 5600
-Wire Wire Line
- 3450 5600 4250 5600
-Wire Wire Line
- 4250 5600 4250 5250
-$Comp
-L Device:C C4
-U 1 1 5F10B718
-P 4900 5150
-F 0 "C4" H 5015 5196 50 0000 L CNN
-F 1 "C" H 5015 5105 50 0000 L CNN
-F 2 "" H 4938 5000 50 0001 C CNN
-F 3 "~" H 4900 5150 50 0001 C CNN
- 1 4900 5150
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4900 5000 4900 4850
-Connection ~ 4900 4850
-$Comp
-L power:GND #PWR014
-U 1 1 5F10B724
-P 4900 5400
-F 0 "#PWR014" H 4900 5150 50 0001 C CNN
-F 1 "GND" H 4905 5227 50 0000 C CNN
-F 2 "" H 4900 5400 50 0001 C CNN
-F 3 "" H 4900 5400 50 0001 C CNN
- 1 4900 5400
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4900 5400 4900 5300
-$Comp
-L Device:C C7
-U 1 1 5F10B72F
-P 5250 4800
-F 0 "C7" H 5365 4846 50 0000 L CNN
-F 1 "C" H 5365 4755 50 0000 L CNN
-F 2 "" H 5288 4650 50 0001 C CNN
-F 3 "~" H 5250 4800 50 0001 C CNN
- 1 5250 4800
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5250 4650 4750 4650
-Connection ~ 4750 4650
-$Comp
-L power:GND #PWR017
-U 1 1 5F10B73B
-P 5250 5050
-F 0 "#PWR017" H 5250 4800 50 0001 C CNN
-F 1 "GND" H 5255 4877 50 0000 C CNN
-F 2 "" H 5250 5050 50 0001 C CNN
-F 3 "" H 5250 5050 50 0001 C CNN
- 1 5250 5050
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5250 5050 5250 4950
-Wire Wire Line
- 2350 4150 2350 2550
-Wire Wire Line
- 2200 4300 2200 2700
-Connection ~ 2200 2700
-Connection ~ 2350 2550
-Wire Wire Line
- 2350 4150 3950 4150
-Wire Wire Line
- 3950 4150 4750 4150
-Wire Wire Line
- 2200 4300 4100 4300
-Wire Wire Line
- 1350 4400 3200 4400
-Wire Wire Line
- 3200 4400 3200 4850
-Wire Wire Line
- 3200 4850 3050 4850
-Connection ~ 3050 4850
-Wire Wire Line
- 2650 2400 2050 2400
-Wire Wire Line
- 2050 2400 2050 4000
-Wire Wire Line
- 2050 4000 2650 4000
-Connection ~ 2650 2400
-Connection ~ 2650 4000
-Wire Wire Line
- 2650 4000 3450 4000
-Wire Wire Line
- 2050 4000 2050 5600
-Wire Wire Line
- 2050 5600 3450 5600
-Connection ~ 2050 4000
-Connection ~ 3450 5600
-$EndSCHEMATC
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 6 6
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Comp
-L Connector:USB_A J1
-U 1 1 5F0CC9AF
-P 2750 1650
-F 0 "J1" H 2807 2117 50 0000 C CNN
-F 1 "USB_A" H 2807 2026 50 0000 C CNN
-F 2 "" H 2900 1600 50 0001 C CNN
-F 3 " ~" H 2900 1600 50 0001 C CNN
- 1 2750 1650
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3050 1650 3050 1750
-$Comp
-L Connector:USB_A J4
-U 1 1 5F0CE176
-P 3550 1650
-F 0 "J4" H 3607 2117 50 0000 C CNN
-F 1 "USB_A" H 3607 2026 50 0000 C CNN
-F 2 "" H 3700 1600 50 0001 C CNN
-F 3 " ~" H 3700 1600 50 0001 C CNN
- 1 3550 1650
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3850 1650 3850 1750
-Wire Wire Line
- 3050 1450 3150 1450
-Wire Wire Line
- 3150 1450 3150 950
-Wire Wire Line
- 3150 950 3950 950
-Wire Wire Line
- 3950 950 3950 1450
-Wire Wire Line
- 3950 1450 3850 1450
-$Comp
-L power:GND #PWR03
-U 1 1 5F0CF308
-P 2750 2100
-F 0 "#PWR03" H 2750 1850 50 0001 C CNN
-F 1 "GND" H 2755 1927 50 0000 C CNN
-F 2 "" H 2750 2100 50 0001 C CNN
-F 3 "" H 2750 2100 50 0001 C CNN
- 1 2750 2100
- 1 0 0 -1
-$EndComp
-$Comp
-L power:GND #PWR06
-U 1 1 5F0CF8C4
-P 3550 2100
-F 0 "#PWR06" H 3550 1850 50 0001 C CNN
-F 1 "GND" H 3555 1927 50 0000 C CNN
-F 2 "" H 3550 2100 50 0001 C CNN
-F 3 "" H 3550 2100 50 0001 C CNN
- 1 3550 2100
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 2750 2100 2750 2050
-Wire Wire Line
- 3550 2100 3550 2050
-Text HLabel 1100 950 0 50 Input ~ 0
-5V
-Wire Wire Line
- 1100 950 2350 950
-Connection ~ 3150 950
-Text HLabel 1100 1100 0 50 Input ~ 0
-13V
-Wire Wire Line
- 1100 1100 2200 1100
-Wire Wire Line
- 3300 1100 3300 1650
-Wire Wire Line
- 3300 1650 3050 1650
-Connection ~ 3050 1650
-Wire Wire Line
- 3300 1100 4100 1100
-Wire Wire Line
- 4100 1100 4100 1650
-Wire Wire Line
- 4100 1650 3850 1650
-Connection ~ 3300 1100
-Connection ~ 3850 1650
-Text HLabel 1100 1250 0 50 Input ~ 0
-GND
-Text HLabel 1350 4400 0 50 BiDi ~ 0
-Battery
-$Comp
-L power:GND #PWR02
-U 1 1 5F0D429A
-P 1200 1300
-F 0 "#PWR02" H 1200 1050 50 0001 C CNN
-F 1 "GND" H 1205 1127 50 0000 C CNN
-F 2 "" H 1200 1300 50 0001 C CNN
-F 3 "" H 1200 1300 50 0001 C CNN
- 1 1200 1300
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 1200 1300 1200 1250
-Wire Wire Line
- 1200 1250 1100 1250
-$Comp
-L Connector:USB_A J7
-U 1 1 5F0D4E49
-P 4350 1650
-F 0 "J7" H 4407 2117 50 0000 C CNN
-F 1 "USB_A" H 4407 2026 50 0000 C CNN
-F 2 "" H 4500 1600 50 0001 C CNN
-F 3 " ~" H 4500 1600 50 0001 C CNN
- 1 4350 1650
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4650 1650 4650 1750
-Wire Wire Line
- 3950 950 4750 950
-Wire Wire Line
- 4750 950 4750 1450
-Wire Wire Line
- 4750 1450 4650 1450
-$Comp
-L power:GND #PWR09
-U 1 1 5F0D4E57
-P 4350 2100
-F 0 "#PWR09" H 4350 1850 50 0001 C CNN
-F 1 "GND" H 4355 1927 50 0000 C CNN
-F 2 "" H 4350 2100 50 0001 C CNN
-F 3 "" H 4350 2100 50 0001 C CNN
- 1 4350 2100
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4350 2100 4350 2050
-Wire Wire Line
- 4100 1100 4900 1100
-Wire Wire Line
- 4900 1100 4900 1650
-Wire Wire Line
- 4900 1650 4650 1650
-Connection ~ 4650 1650
-Connection ~ 3950 950
-Connection ~ 4100 1100
-Wire Wire Line
- 2650 2400 3450 2400
-Wire Wire Line
- 2650 2050 2650 2400
-Wire Wire Line
- 3450 2050 3450 2400
-Wire Wire Line
- 3450 2400 4250 2400
-Wire Wire Line
- 4250 2400 4250 2050
-Connection ~ 3450 2400
-$Comp
-L Device:C C2
-U 1 1 5F0D832F
-P 4900 1950
-F 0 "C2" H 5015 1996 50 0000 L CNN
-F 1 "C" H 5015 1905 50 0000 L CNN
-F 2 "" H 4938 1800 50 0001 C CNN
-F 3 "~" H 4900 1950 50 0001 C CNN
- 1 4900 1950
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4900 1800 4900 1650
-Connection ~ 4900 1650
-$Comp
-L power:GND #PWR012
-U 1 1 5F0D8E3C
-P 4900 2200
-F 0 "#PWR012" H 4900 1950 50 0001 C CNN
-F 1 "GND" H 4905 2027 50 0000 C CNN
-F 2 "" H 4900 2200 50 0001 C CNN
-F 3 "" H 4900 2200 50 0001 C CNN
- 1 4900 2200
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4900 2200 4900 2100
-$Comp
-L Device:C C5
-U 1 1 5F0D95F5
-P 5250 1600
-F 0 "C5" H 5365 1646 50 0000 L CNN
-F 1 "C" H 5365 1555 50 0000 L CNN
-F 2 "" H 5288 1450 50 0001 C CNN
-F 3 "~" H 5250 1600 50 0001 C CNN
- 1 5250 1600
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5250 1450 4750 1450
-Connection ~ 4750 1450
-$Comp
-L power:GND #PWR015
-U 1 1 5F0D9E27
-P 5250 1850
-F 0 "#PWR015" H 5250 1600 50 0001 C CNN
-F 1 "GND" H 5255 1677 50 0000 C CNN
-F 2 "" H 5250 1850 50 0001 C CNN
-F 3 "" H 5250 1850 50 0001 C CNN
- 1 5250 1850
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5250 1850 5250 1750
-$Comp
-L Connector:USB_A J2
-U 1 1 5F0DE4EE
-P 2750 3250
-F 0 "J2" H 2807 3717 50 0000 C CNN
-F 1 "USB_A" H 2807 3626 50 0000 C CNN
-F 2 "" H 2900 3200 50 0001 C CNN
-F 3 " ~" H 2900 3200 50 0001 C CNN
- 1 2750 3250
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3050 3250 3050 3350
-$Comp
-L Connector:USB_A J5
-U 1 1 5F0DE4F9
-P 3550 3250
-F 0 "J5" H 3607 3717 50 0000 C CNN
-F 1 "USB_A" H 3607 3626 50 0000 C CNN
-F 2 "" H 3700 3200 50 0001 C CNN
-F 3 " ~" H 3700 3200 50 0001 C CNN
- 1 3550 3250
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3850 3250 3850 3350
-Wire Wire Line
- 3050 3050 3150 3050
-Wire Wire Line
- 3150 3050 3150 2550
-Wire Wire Line
- 3150 2550 3950 2550
-Wire Wire Line
- 3950 2550 3950 3050
-Wire Wire Line
- 3950 3050 3850 3050
-$Comp
-L power:GND #PWR04
-U 1 1 5F0DE509
-P 2750 3700
-F 0 "#PWR04" H 2750 3450 50 0001 C CNN
-F 1 "GND" H 2755 3527 50 0000 C CNN
-F 2 "" H 2750 3700 50 0001 C CNN
-F 3 "" H 2750 3700 50 0001 C CNN
- 1 2750 3700
- 1 0 0 -1
-$EndComp
-$Comp
-L power:GND #PWR07
-U 1 1 5F0DE513
-P 3550 3700
-F 0 "#PWR07" H 3550 3450 50 0001 C CNN
-F 1 "GND" H 3555 3527 50 0000 C CNN
-F 2 "" H 3550 3700 50 0001 C CNN
-F 3 "" H 3550 3700 50 0001 C CNN
- 1 3550 3700
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 2750 3700 2750 3650
-Wire Wire Line
- 3550 3700 3550 3650
-Wire Wire Line
- 3300 2700 3300 3250
-Wire Wire Line
- 3300 3250 3050 3250
-Connection ~ 3050 3250
-Wire Wire Line
- 3300 2700 4100 2700
-Wire Wire Line
- 4100 2700 4100 3250
-Wire Wire Line
- 4100 3250 3850 3250
-Connection ~ 3850 3250
-$Comp
-L Connector:USB_A J8
-U 1 1 5F0DE52A
-P 4350 3250
-F 0 "J8" H 4407 3717 50 0000 C CNN
-F 1 "USB_A" H 4407 3626 50 0000 C CNN
-F 2 "" H 4500 3200 50 0001 C CNN
-F 3 " ~" H 4500 3200 50 0001 C CNN
- 1 4350 3250
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4650 3250 4650 3350
-Wire Wire Line
- 3950 2550 4750 2550
-Wire Wire Line
- 4750 2550 4750 3050
-Wire Wire Line
- 4750 3050 4650 3050
-$Comp
-L power:GND #PWR010
-U 1 1 5F0DE538
-P 4350 3700
-F 0 "#PWR010" H 4350 3450 50 0001 C CNN
-F 1 "GND" H 4355 3527 50 0000 C CNN
-F 2 "" H 4350 3700 50 0001 C CNN
-F 3 "" H 4350 3700 50 0001 C CNN
- 1 4350 3700
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4350 3700 4350 3650
-Wire Wire Line
- 4100 2700 4900 2700
-Wire Wire Line
- 4900 2700 4900 3250
-Wire Wire Line
- 4900 3250 4650 3250
-Connection ~ 4650 3250
-Connection ~ 3950 2550
-Connection ~ 4100 2700
-Wire Wire Line
- 2650 3650 2650 4000
-Wire Wire Line
- 3450 3650 3450 4000
-Wire Wire Line
- 3450 4000 4250 4000
-Wire Wire Line
- 4250 4000 4250 3650
-Connection ~ 3450 4000
-$Comp
-L Device:C C3
-U 1 1 5F0DE54F
-P 4900 3550
-F 0 "C3" H 5015 3596 50 0000 L CNN
-F 1 "C" H 5015 3505 50 0000 L CNN
-F 2 "" H 4938 3400 50 0001 C CNN
-F 3 "~" H 4900 3550 50 0001 C CNN
- 1 4900 3550
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4900 3400 4900 3250
-Connection ~ 4900 3250
-$Comp
-L power:GND #PWR013
-U 1 1 5F0DE55B
-P 4900 3800
-F 0 "#PWR013" H 4900 3550 50 0001 C CNN
-F 1 "GND" H 4905 3627 50 0000 C CNN
-F 2 "" H 4900 3800 50 0001 C CNN
-F 3 "" H 4900 3800 50 0001 C CNN
- 1 4900 3800
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4900 3800 4900 3700
-$Comp
-L Device:C C6
-U 1 1 5F0DE566
-P 5250 3200
-F 0 "C6" H 5365 3246 50 0000 L CNN
-F 1 "C" H 5365 3155 50 0000 L CNN
-F 2 "" H 5288 3050 50 0001 C CNN
-F 3 "~" H 5250 3200 50 0001 C CNN
- 1 5250 3200
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5250 3050 4750 3050
-Connection ~ 4750 3050
-$Comp
-L power:GND #PWR016
-U 1 1 5F0DE572
-P 5250 3450
-F 0 "#PWR016" H 5250 3200 50 0001 C CNN
-F 1 "GND" H 5255 3277 50 0000 C CNN
-F 2 "" H 5250 3450 50 0001 C CNN
-F 3 "" H 5250 3450 50 0001 C CNN
- 1 5250 3450
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5250 3450 5250 3350
-Wire Wire Line
- 3150 2550 2350 2550
-Wire Wire Line
- 2350 2550 2350 950
-Connection ~ 3150 2550
-Connection ~ 2350 950
-Wire Wire Line
- 2350 950 3150 950
-Wire Wire Line
- 3300 2700 2200 2700
-Wire Wire Line
- 2200 2700 2200 1100
-Connection ~ 3300 2700
-Connection ~ 2200 1100
-Wire Wire Line
- 2200 1100 3300 1100
-$Comp
-L Connector:USB_A J3
-U 1 1 5F10B6BB
-P 2750 4850
-F 0 "J3" H 2807 5317 50 0000 C CNN
-F 1 "USB_A" H 2807 5226 50 0000 C CNN
-F 2 "" H 2900 4800 50 0001 C CNN
-F 3 " ~" H 2900 4800 50 0001 C CNN
- 1 2750 4850
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3050 4850 3050 4950
-$Comp
-L Connector:USB_A J6
-U 1 1 5F10B6C6
-P 3550 4850
-F 0 "J6" H 3607 5317 50 0000 C CNN
-F 1 "USB_A" H 3607 5226 50 0000 C CNN
-F 2 "" H 3700 4800 50 0001 C CNN
-F 3 " ~" H 3700 4800 50 0001 C CNN
- 1 3550 4850
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 3850 4850 3850 4950
-Wire Wire Line
- 3950 4150 3950 4650
-Wire Wire Line
- 3950 4650 3850 4650
-$Comp
-L power:GND #PWR05
-U 1 1 5F10B6D6
-P 2750 5300
-F 0 "#PWR05" H 2750 5050 50 0001 C CNN
-F 1 "GND" H 2755 5127 50 0000 C CNN
-F 2 "" H 2750 5300 50 0001 C CNN
-F 3 "" H 2750 5300 50 0001 C CNN
- 1 2750 5300
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-<title>Battery charger and dual power supply unit</title>
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-<meta name="generator" content="Org-mode">
-<meta name="author" content="Svjatoslav Agejenko">
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-<div id="content" class="container">
-<div class="row"><div class="col-md-9"><h1 class="title">Battery charger and dual power supply unit</h1>
-
-<div id="outline-container-sec-1" class="outline-2">
-<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.
-</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.
-</li>
-
-<li>Authors:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko
-<ul class="org-ul">
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
-</li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-
-<li>Valeria Agejenko
-</li>
-</ul>
-</li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a>
-</li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-2" class="outline-2">
-<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-<p>
-I needed dual voltage power supply for my lab that runs on mains
-electricity (wall power) and slowly charges (use-changing) attached
-12V Lead-Acid battery. Lead-acid battery in turn provides high current
-when needed as well as power in portable situations or when mains
-electricity is not available.
-</p>
-
-
-<figure>
-<p><img src="make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-
-<p>
-Power supply provides about 13 Volts and 5 Volts simultaneously.
-</p>
-
-<p>
-<b>!!!WARNING!!!</b> <a href="../alternative%20USB%20layout/">Alternative and incompatible USB wiring/layout</a> is
-being used here.
-</p>
-
-<p>
-<b>Normal USB devices and cables should not be plugged in! It would
-damage device/cable and likely power supply.</b>
-</p>
-
-<p>
-I found USB-A connectors to be easily available, cheap, reliable and
-functional, so I re-purposed connector for my own needs but I'm using
-totally incompatible electrical wiring.
-</p>
-
-
-<figure>
-<p><img src="../alternative%20USB%20layout/schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-</figure>
-
-<p>
-As seen, it has dual voltage output. Additionally one wire is
-dedicated to data transmission and can be used with <a href="https://en.wikipedia.org/wiki/1-Wire">1-Wire</a> protocol
-</p>
-
-<p>
-1-Wire data router/hub is really simple. Power supply simply passively
-links all data wires together.
-</p>
-
-<p>
-Power supply uses 3D printed body with lots of holes, for fanless
-cooling.
-</p>
-
-
-<figure>
-<p><img src="body%20and%20covers/body,%201.png" class="img-responsive" alt="body,%201.png">
-</p>
-</figure>
-
-<p>
-Various modules are realized on top of prototype PCBs that slide into
-dedicated rails within the body.
-</p>
-
-
-<figure>
-<p><img src="body%20and%20covers/body,%202.png" class="img-responsive" alt="body,%202.png">
-</p>
-</figure>
-
-<p>
-Like this:
-</p>
-
-
-<figure>
-<p><img src="make,%202.png" class="img-responsive" alt="make,%202.png">
-</p>
-</figure>
-
-<p>
-When cover is closed, it blocks PCB movement:
-</p>
-
-
-<figure>
-<p><img src="body%20and%20covers/cover.png" class="img-responsive" alt="cover.png">
-</p>
-</figure>
-
-<p>
-There is still some empty space inside, so why not add dummy cover on
-top that can be replaced later with add-on functionality/expansion
-board/terminal :)
-</p>
-
-
-<figure>
-<p><img src="body%20and%20covers/cover%20cover.png" class="img-responsive" alt="cover%20cover.png">
-</p>
-</figure>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="body%20and%20covers/body.stl">Body STL file</a>
-</li>
-<li><a href="body%20and%20covers/cover.stl">Big cover STL file</a>
-</li>
-<li><a href="body%20and%20covers/cover%20cover.stl">Small dummy cover on top, STL file</a>
-</li>
-<li><a href="body%20and%20covers/body%20and%20covers.FCStd">Body and covers FreeCAD project</a>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-3" class="outline-2">
-<h2 id="sec-3"><span class="section-number-2">3</span> Transformer and AC to DC converter</h2>
-<div class="outline-text-2" id="text-3">
-<p>
-This is where high voltage from mains electricity enters the system.
-</p>
-
-<p>
-Schematic:
-<img src="transformer%20and%20AC%20DC%20converter%20board/schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-
-<p>
-For safety I kept high voltage section as minimal as possible. That
-is, wall plug runs straight into transformer. Also I used <a href="https://www.amazon.de/gp/product/B07VGQKM3G/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1">UV hardening
-glue</a> for extra safety and isolation on PCB.
-</p>
-
-<p>
-Power on/off switch operates on already reduced voltage of about 30
-volts. Power switch is located on <a href="#sec-6">indicator panel</a>.
-</p>
-
-
-<figure>
-<p><img src="transformer%20and%20AC%20DC%20converter%20board/make,%201.png" class="img-responsive" alt="make,%201.png">
-</p>
-</figure>
-
-<p>
-DC current of about 30 volts is then routed to <a href="#sec-4">Main board</a>.
-</p>
-
-
-<figure>
-<p><img src="transformer%20and%20AC%20DC%20converter%20board/make,%202.png" class="img-responsive" alt="make,%202.png">
-</p>
-</figure>
-
-<p>
-<a href="https://www.amazon.de/gp/product/B07RLQH5TR/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1">Single sided prototype PCB is used</a>.
-</p>
-</div>
-</div>
-
-<div id="outline-container-sec-4" class="outline-2">
-<h2 id="sec-4"><a id="ID-65d68227-4bf2-4c4f-b4d3-c390bc6a9c34" name="ID-65d68227-4bf2-4c4f-b4d3-c390bc6a9c34"></a><span class="section-number-2">4</span> Main board</h2>
-<div class="outline-text-2" id="text-4">
-<p>
-This is logically main board because it appears to be central hub that
-connects all components. It also houses 2 <a href="https://www.amazon.de/gp/product/B072MQYJ93/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1">adjustable DC-DC Step Down
-voltage converters</a>.
-</p>
-
-
-<figure>
-<p><img src="main%20board/main%20board,%201.png" class="img-responsive" alt="main%20board,%201.png">
-</p>
-</figure>
-
-<p>
-High-level schematic of entire device:
-<img src="main%20board/schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-
-<p>
-As seen from schematic, ~30 volts DC from transformer board is routed
-into first step-down converter that reduces it to about 15V. Reduced
-voltage is then directed to <a href="#sec-5">Current limiter circuit</a>. Current limiter
-loses about 2 volts. Now we have current and voltage limited power at
-about 13 volts. This power is used to charge connected 12V Lead-Acid
-battery. Also the same power is routed to <a href="#sec-7">connector terminal</a> to be
-consumed by connected devices.
-</p>
-
-<p>
-As seen from this schematic, device is not meant to provide high
-current for long periods of time. Instead it gets comparatively
-limited current to charge the battery and feed devices with low
-current requirements. Occasional current spikes are backed up by
-battery that stays in use-changing mode.
-</p>
-
-<p>
-Also about 13V output voltage is approximate and depends on connected
-battery charge level.
-</p>
-
-<p>
-Second Step-Down converter reduces voltage even further to quite
-precisely 5V DC. This resulting voltage is also routed to <a href="#sec-7">connector
-terminal</a>.
-</p>
-
-<p>
-Both 13V and 5V lines are also routed to <a href="#sec-6">indicator panel</a> for
-monitoring.
-</p>
-
-<p>
-There is single on/off switch. In off position, it disconnects battery
-and transformer from the system effectively powering everything down.
-</p>
-
-<p>
-On schematic above, some wires are annotated with numbers from 1
-to 13. This corresponds to output pins on the board.
-</p>
-
-
-<figure>
-<p><img src="main%20board/main%20board,%202.png" class="img-responsive" alt="main%20board,%202.png">
-</p>
-</figure>
-</div>
-</div>
-<div id="outline-container-sec-5" class="outline-2">
-<h2 id="sec-5"><a id="ID-afc22d23-9bc4-421c-9cac-e0ce34bd36bc" name="ID-afc22d23-9bc4-421c-9cac-e0ce34bd36bc"></a><span class="section-number-2">5</span> Current limiter</h2>
-<div class="outline-text-2" id="text-5">
-<p>
-Schematic:
-<img src="current%20limiter/schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-
-<p>
-Simple LM317 based current limiter is used. I used 4.7 ohm
-resistor. It provides about 265 milliamps of current. See <a href="http://www.reuk.co.uk/wordpress/electric-circuit/lm317-current-calculator/">calculator</a>.
-</p>
-
-
-<figure>
-<p><img src="current%20limiter/current%20limiter,%201.png" class="img-responsive" alt="current%20limiter,%201.png">
-</p>
-</figure>
-
-<p>
-Thermal paste below and UV hardening glue on top is used to attach
-LM317 to the heatsink. There is also jumper-like solution on top
-right. This is handy to attach multimeter tap to verify/monitor
-current during initial device calibration.
-</p>
-
-<p>
-If attached battery is really empty, significant voltage drop can
-occur in LM317. Heatsink is needed to dissipate that power.
-</p>
-
-
-<figure>
-<p><img src="current%20limiter/current%20limiter,%202.png" class="img-responsive" alt="current%20limiter,%202.png">
-</p>
-</figure>
-
-<p>
-Note: resistor gets hot too.
-</p>
-</div>
-</div>
-
-<div id="outline-container-sec-6" class="outline-2">
-<h2 id="sec-6"><a id="ID-c9a69490-f920-4a31-b32e-b101bfc3d01b" name="ID-c9a69490-f920-4a31-b32e-b101bfc3d01b"></a><span class="section-number-2">6</span> Indicator panel</h2>
-<div class="outline-text-2" id="text-6">
-
-<figure>
-<p><img src="indicator%20panel/indicator%20panel,%201.png" class="img-responsive" alt="indicator%20panel,%201.png">
-</p>
-</figure>
-
-<p>
-Basically 2 digital DC voltmeters and main on/off switch.
-</p>
-
-
-<figure>
-<p><img src="indicator%20panel/indicator%20panel,%202.png" class="img-responsive" alt="indicator%20panel,%202.png">
-</p>
-</figure>
-
-<p>
-Download:
-</p>
-
-
-<figure>
-<p><img src="indicator%20panel/indicator%20panel.png" class="img-responsive" alt="indicator%20panel.png">
-</p>
-</figure>
-
-<ul class="org-ul">
-<li><a href="indicator%20panel/indicator%20panel.stl">STL file</a>
-</li>
-<li><a href="indicator%20panel/indicator%20panel.FCStd">FreeCAD project</a>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-7" class="outline-2">
-<h2 id="sec-7"><a id="ID-e33940bd-652f-4ec0-b53b-1c03e16941c8" name="ID-e33940bd-652f-4ec0-b53b-1c03e16941c8"></a><span class="section-number-2">7</span> Connector terminal</h2>
-<div class="outline-text-2" id="text-7">
-<p>
-Schematic:
-<img src="connector%20terminal/schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-
-<p>
-As seen above, most of the USB connectors are used to deliver dual
-power output and 1-wire data connectivity, except one on the bottom
-right. This is used to attach 12V battery. Some capacitors are thrown
-in as well to stabilize against smaller current spikes.
-</p>
-
-<p>
-Electrically schematic is realized using smaller prototype PCBs.
-</p>
-
-
-<figure>
-<p><img src="connector%20terminal/make,%201.png" class="img-responsive" alt="make,%201.png">
-</p>
-</figure>
-
-
-<p>
-Those PCBs are wired to central small PCB that acts as a hub:
-</p>
-
-
-<figure>
-<p><img src="connector%20terminal/make,%202.png" class="img-responsive" alt="make,%202.png">
-</p>
-</figure>
-
-<p>
-PCBs are held together by being sandwiched between front panel:
-</p>
-
-
-<figure>
-<p><img src="connector%20terminal/front%20panel.png" class="img-responsive" alt="front%20panel.png">
-</p>
-</figure>
-
-<p>
-and smaller back-end plate:
-</p>
-
-
-<figure>
-<p><img src="connector%20terminal/back%20panel.png" class="img-responsive" alt="back%20panel.png">
-</p>
-</figure>
-
-<p>
-Result:
-</p>
-
-
-<figure>
-<p><img src="connector%20terminal/make,%203.png" class="img-responsive" alt="make,%203.png">
-</p>
-</figure>
-
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="connector%20terminal/front%20panel.stl">front panel STL</a>
-</li>
-<li><a href="connector%20terminal/back%20panel.stl">back panel STL</a>
-</li>
-<li><a href="connector%20terminal/connector%20terminal.FCStd">FreeCAD project</a>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-8" class="outline-2">
-<h2 id="sec-8"><span class="section-number-2">8</span> Calibration</h2>
-<div class="outline-text-2" id="text-8">
-<p>
-Since device uses adjustable step-down modules, these need to be
-calibrated to provide correct output voltage. It is important that
-battery receives proper charging voltage otherwise either no charging
-occurs or battery starts gassing out and gets destroyed.
-</p>
-
-<p>
-See here for more details: <a href="https://www.powerstream.com/SLA.htm">https://www.powerstream.com/SLA.htm</a>
-</p>
-
-<hr >
-
-<p>
-Happy building! :)
-</p>
-</div>
-</div>
-</div><div class="col-md-3"><nav id="table-of-contents">
-<div id="text-table-of-contents" class="bs-docs-sidebar">
-<ul class="nav">
-<li><a href="#sec-1">1. General</a></li>
-<li><a href="#sec-2">2. Project description</a></li>
-<li><a href="#sec-3">3. Transformer and AC to DC converter</a></li>
-<li><a href="#sec-4">4. Main board</a></li>
-<li><a href="#sec-5">5. Current limiter</a></li>
-<li><a href="#sec-6">6. Indicator panel</a></li>
-<li><a href="#sec-7">7. Connector terminal</a></li>
-<li><a href="#sec-8">8. Calibration</a></li>
-</ul>
-</div>
-</nav>
-</div></div></div>
-<footer id="postamble" class="">
-<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2021-01-03 P 00:39</p>
-<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
-</div>
-</footer>
-</body>
-</html>
+++ /dev/null
-#+TITLE: Battery charger and dual power supply unit
-#+AUTHOR: Svjatoslav Agejenko
-#+LANGUAGE: en
-
-* (document settings) :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD: footer {background-color: #111 !important;}
-#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Authors:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
- - Valeria Agejenko
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-I needed dual voltage power supply for my lab that runs on mains
-electricity (wall power) and slowly charges (use-changing) attached
-12V Lead-Acid battery. Lead-acid battery in turn provides high current
-when needed as well as power in portable situations or when mains
-electricity is not available.
-
-[[file:make.png]]
-
-Power supply provides about 13 Volts and 5 Volts simultaneously.
-
-*!!!WARNING!!!* [[../alternative%20USB%20layout/][Alternative and incompatible USB wiring/layout]] is
-being used here.
-
-*Normal USB devices and cables should not be plugged in! It would
-damage device/cable and likely power supply.*
-
-I found USB-A connectors to be easily available, cheap, reliable and
-functional, so I re-purposed connector for my own needs but I'm using
-totally incompatible electrical wiring.
-
-[[file:../alternative%20USB%20layout/schematic.png]]
-
-As seen, it has dual voltage output. Additionally one wire is
-dedicated to data transmission and can be used with [[https://en.wikipedia.org/wiki/1-Wire][1-Wire]] protocol
-
-1-Wire data router/hub is really simple. Power supply simply passively
-links all data wires together.
-
-Power supply uses 3D printed body with lots of holes, for fanless
-cooling.
-
-[[file:body%20and%20covers/body,%201.png]]
-
-Various modules are realized on top of prototype PCBs that slide into
-dedicated rails within the body.
-
-[[file:body%20and%20covers/body,%202.png]]
-
-Like this:
-
-[[file:make,%202.png]]
-
-When cover is closed, it blocks PCB movement:
-
-[[file:body%20and%20covers/cover.png]]
-
-There is still some empty space inside, so why not add dummy cover on
-top that can be replaced later with add-on functionality/expansion
-board/terminal :)
-
-[[file:body%20and%20covers/cover%20cover.png]]
-
-Download:
-+ [[file:body%20and%20covers/body.stl][Body STL file]]
-+ [[file:body%20and%20covers/cover.stl][Big cover STL file]]
-+ [[file:body%20and%20covers/cover%20cover.stl][Small dummy cover on top, STL file]]
-+ [[file:body%20and%20covers/body%20and%20covers.FCStd][Body and covers FreeCAD project]]
-
-* Transformer and AC to DC converter
-
-This is where high voltage from mains electricity enters the system.
-
-Schematic:
-[[file:transformer%20and%20AC%20DC%20converter%20board/schematic.png]]
-
-For safety I kept high voltage section as minimal as possible. That
-is, wall plug runs straight into transformer. Also I used [[https://www.amazon.de/gp/product/B07VGQKM3G/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1][UV hardening
-glue]] for extra safety and isolation on PCB.
-
-Power on/off switch operates on already reduced voltage of about 30
-volts. Power switch is located on [[id:c9a69490-f920-4a31-b32e-b101bfc3d01b][indicator panel]].
-
-[[file:transformer%20and%20AC%20DC%20converter%20board/make,%201.png]]
-
-DC current of about 30 volts is then routed to [[id:65d68227-4bf2-4c4f-b4d3-c390bc6a9c34][Main board]].
-
-[[file:transformer%20and%20AC%20DC%20converter%20board/make,%202.png]]
-
-[[https://www.amazon.de/gp/product/B07RLQH5TR/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1][Single sided prototype PCB is used]].
-
-* Main board
-:PROPERTIES:
-:ID: 65d68227-4bf2-4c4f-b4d3-c390bc6a9c34
-:END:
-
-This is logically main board because it appears to be central hub that
-connects all components. It also houses 2 [[https://www.amazon.de/gp/product/B072MQYJ93/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1][adjustable DC-DC Step Down
-voltage converters]].
-
-[[file:main%20board/main%20board,%201.png]]
-
-High-level schematic of entire device:
-[[file:main%20board/schematic.png]]
-
-As seen from schematic, ~30 volts DC from transformer board is routed
-into first step-down converter that reduces it to about 15V. Reduced
-voltage is then directed to [[id:afc22d23-9bc4-421c-9cac-e0ce34bd36bc][Current limiter circuit]]. Current limiter
-loses about 2 volts. Now we have current and voltage limited power at
-about 13 volts. This power is used to charge connected 12V Lead-Acid
-battery. Also the same power is routed to [[id:e33940bd-652f-4ec0-b53b-1c03e16941c8][connector terminal]] to be
-consumed by connected devices.
-
-As seen from this schematic, device is not meant to provide high
-current for long periods of time. Instead it gets comparatively
-limited current to charge the battery and feed devices with low
-current requirements. Occasional current spikes are backed up by
-battery that stays in use-changing mode.
-
-Also about 13V output voltage is approximate and depends on connected
-battery charge level.
-
-Second Step-Down converter reduces voltage even further to quite
-precisely 5V DC. This resulting voltage is also routed to [[id:e33940bd-652f-4ec0-b53b-1c03e16941c8][connector
-terminal]].
-
-Both 13V and 5V lines are also routed to [[id:c9a69490-f920-4a31-b32e-b101bfc3d01b][indicator panel]] for
-monitoring.
-
-There is single on/off switch. In off position, it disconnects battery
-and transformer from the system effectively powering everything down.
-
-On schematic above, some wires are annotated with numbers from 1
-to 13. This corresponds to output pins on the board.
-
-[[file:main%20board/main%20board,%202.png]]
-* Current limiter
-:PROPERTIES:
-:ID: afc22d23-9bc4-421c-9cac-e0ce34bd36bc
-:END:
-
-Schematic:
-[[file:current%20limiter/schematic.png]]
-
-Simple LM317 based current limiter is used. I used 4.7 ohm
-resistor. It provides about 265 milliamps of current. See [[http://www.reuk.co.uk/wordpress/electric-circuit/lm317-current-calculator/][calculator]].
-
-[[file:current%20limiter/current%20limiter,%201.png]]
-
-Thermal paste below and UV hardening glue on top is used to attach
-LM317 to the heatsink. There is also jumper-like solution on top
-right. This is handy to attach multimeter tap to verify/monitor
-current during initial device calibration.
-
-If attached battery is really empty, significant voltage drop can
-occur in LM317. Heatsink is needed to dissipate that power.
-
-[[file:current%20limiter/current%20limiter,%202.png]]
-
-Note: resistor gets hot too.
-
-* Indicator panel
-:PROPERTIES:
-:ID: c9a69490-f920-4a31-b32e-b101bfc3d01b
-:END:
-
-[[file:indicator%20panel/indicator%20panel,%201.png]]
-
-Basically 2 digital DC voltmeters and main on/off switch.
-
-[[file:indicator%20panel/indicator%20panel,%202.png]]
-
-Download:
-
-[[file:indicator%20panel/indicator%20panel.png]]
-
-+ [[file:indicator%20panel/indicator%20panel.stl][STL file]]
-+ [[file:indicator%20panel/indicator%20panel.FCStd][FreeCAD project]]
-
-* Connector terminal
-:PROPERTIES:
-:ID: e33940bd-652f-4ec0-b53b-1c03e16941c8
-:END:
-
-Schematic:
-[[file:connector%20terminal/schematic.png]]
-
-As seen above, most of the USB connectors are used to deliver dual
-power output and 1-wire data connectivity, except one on the bottom
-right. This is used to attach 12V battery. Some capacitors are thrown
-in as well to stabilize against smaller current spikes.
-
-Electrically schematic is realized using smaller prototype PCBs.
-
-[[file:connector%20terminal/make,%201.png]]
-
-
-Those PCBs are wired to central small PCB that acts as a hub:
-
-[[file:connector%20terminal/make,%202.png]]
-
-PCBs are held together by being sandwiched between front panel:
-
-[[file:connector%20terminal/front%20panel.png]]
-
-and smaller back-end plate:
-
-[[file:connector%20terminal/back%20panel.png]]
-
-Result:
-
-[[file:connector%20terminal/make,%203.png]]
-
-
-Download:
-+ [[file:connector%20terminal/front%20panel.stl][front panel STL]]
-+ [[file:connector%20terminal/back%20panel.stl][back panel STL]]
-+ [[file:connector%20terminal/connector%20terminal.FCStd][FreeCAD project]]
-
-* Calibration
-
-Since device uses adjustable step-down modules, these need to be
-calibrated to provide correct output voltage. It is important that
-battery receives proper charging voltage otherwise either no charging
-occurs or battery starts gassing out and gets destroyed.
-
-See here for more details: https://www.powerstream.com/SLA.htm
-
------
-
-Happy building! :)
+++ /dev/null
-
-
-Thermistor used: UEI005 (NTC Thermistor)
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 1 3
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$EndSCHEMATC
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 1 3
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$EndSCHEMATC
+++ /dev/null
-EESchema-LIBRARY Version 2.4
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- }
- }
- /*]]>*///-->
-// @license-end
-</script>
-</head>
-<body>
-<div id="content">
-<h1 class="title">Ham radio battery charger mod</h1>
-<div id="table-of-contents">
-<h2>Table of Contents</h2>
-<div id="text-table-of-contents">
-<ul>
-<li><a href="#org6c82e4b">1. General</a></li>
-<li><a href="#orgc5c8965">2. Project description</a></li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-org6c82e4b" class="outline-2">
-<h2 id="org6c82e4b"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.</li>
-
-<li>Authors:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko
-<ul class="org-ul">
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a></li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a></li>
-</ul></li>
-
-<li>Valeria Agejenko</li>
-</ul></li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a></li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a></li>
-</ul></li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-orgc5c8965" class="outline-2">
-<h2 id="orgc5c8965"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-<p>
-Warning: this project is quite hacky. It requires breaking original
-charger to get required critical charger part. Instructions are not
-very detailed. Only describe the overall idea. Do not attempt to
-reproduce this unless you exactly know what you are doing.
-</p>
-
-<hr />
-
-
-<p>
-I have Baofeng GT-STP and Baofeng UV-82 radios. Their batteries have
-slightly different geometry, so chargers are physically not
-compatible. Also each changer comes with its own power adapter to plug
-into wall power socket. Electrically batteries are apparently
-compatible.
-</p>
-
-<p>
-By building this battery charger I solved 2 issues:
-</p>
-<ul class="org-ul">
-<li>It can charge batteries for both radios. Is physically and
-electrically compatible to both models.</li>
-<li>Wall adapter is no longer needed. Now it is powered by USB connector
-from computer.</li>
-</ul>
-
-
-<div id="orgef5e369" class="figure">
-<p><img src="make.png" alt="make.png" />
-</p>
-</div>
-
-<p>
-Body ignores small physical differences between batteries and both can
-be plugged in.
-</p>
-
-
-<div id="org17d6a62" class="figure">
-<p><img src="body.png" alt="body.png" />
-</p>
-</div>
-
-<p>
-Front side contains critical fragment of the original changer circuit
-board to drive the actual battery charging.
-</p>
-
-
-<div id="orga02cdec" class="figure">
-<p><img src="make, 1.png" alt="make, 1.png" />
-</p>
-</div>
-
-<p>
-Back side contains voltage upstep converter that is tuned to convert
-5V USB input to 10V output that is required by the charger.
-</p>
-
-
-<div id="org0433379" class="figure">
-<p><img src="make, 2.png" alt="make, 2.png" />
-</p>
-</div>
-
-<p>
-Voltage upstep converter can produce significant voltage
-ripples/impulses that travel backwards to the power source and forward
-to the changer. To reduce this effect, there are capacitors and
-inductor.
-</p>
-
-
-<div id="orgff0d03f" class="figure">
-<p><img src="electrical.png" alt="electrical.png" />
-</p>
-</div>
-
-<p>
-Front and back sides are connected by wiring at the bottom. Also there
-are screws to hold original Baofeng charger pins/springs that connect
-to the battery.
-</p>
-
-
-<div id="orge59d24a" class="figure">
-<p><img src="make, 3.png" alt="make, 3.png" />
-</p>
-</div>
-
-<p>
-After assembly is complete, back, front and bottom parts are sealed
-with lid: <img src="cover.png" alt="cover.png" />
-</p>
-</div>
-</div>
-</div>
-<div id="postamble" class="status">
-<p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2021-04-11 Sun 21:46</p>
-<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
-</div>
-</body>
-</html>
+++ /dev/null
-#+TITLE: Ham radio battery charger mod
-#+author: Svjatoslav Agejenko
-#+LANGUAGE: en
-
-* (document settings) :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD: footer {background-color: #111 !important;}
-#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Authors:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
- - Valeria Agejenko
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-
-Warning: this project is quite hacky. It requires breaking original
-charger to get required critical charger part. Instructions are not
-very detailed. Only describe the overall idea. Do not attempt to
-reproduce this unless you exactly know what you are doing.
-
-------
-
-
-I have Baofeng GT-STP and Baofeng UV-82 radios. Their batteries have
-slightly different geometry, so chargers are physically not
-compatible. Also each changer comes with its own power adapter to plug
-into wall power socket. Electrically batteries are apparently
-compatible.
-
-By building this battery charger I solved 2 issues:
-+ It can charge batteries for both radios. Is physically and
- electrically compatible to both models.
-+ Wall adapter is no longer needed. Now it is powered by USB connector
- from computer.
-
-[[file:make.png]]
-
-Body ignores small physical differences between batteries and both can
-be plugged in.
-
-[[file:body.png]]
-
-Front side contains critical fragment of the original changer circuit
-board to drive the actual battery charging.
-
-[[file:make, 1.png]]
-
-Back side contains voltage upstep converter that is tuned to convert
-5V USB input to 10V output that is required by the charger.
-
-[[file:make, 2.png]]
-
-Voltage upstep converter can produce significant voltage
-ripples/impulses that travel backwards to the power source and forward
-to the changer. To reduce this effect, there are capacitors and
-inductor.
-
-[[file:electrical.png]]
-
-Front and back sides are connected by wiring at the bottom. Also there
-are screws to hold original Baofeng charger pins/springs that connect
-to the battery.
-
-[[file:make, 3.png]]
-
-After assembly is complete, back, front and bottom parts are sealed
-with lid: [[file:cover.png]]
+++ /dev/null
-<!doctype html>
-<html lang="en">
-<head>
-<title>USB desk fan modification</title>
-<!-- 2020-08-10 Mon 07:18 -->
-<meta charset="utf-8">
-<meta name="viewport" content="width=device-width, initial-scale=1">
-<meta name="generator" content="Org-mode">
-<meta name="author" content="Svjatoslav Agejenko">
-<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
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-
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- font-size: 18px;
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- position: absolute;
- bottom: 0;
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-footer > div {
- padding: 10px;
-}
-
-footer p {
- margin: 0 0 5px;
- text-align: center;
- font-size: 16px;
-}
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-#table-of-contents {
- margin-top: 20px;
- margin-bottom: 20px;
-}
-
-blockquote p {
- font-size: 18px;
-}
-
-pre {
- font-size: 16px;
-}
-
-.footpara {
- display: inline-block;
-}
-
-figcaption {
- font-size: 16px;
- color: #666;
- font-style: italic;
- padding-bottom: 15px;
-}
-
-/* from twbs docs */
-
-.bs-docs-sidebar.affix {
- position: static;
-}
-@media (min-width: 768px) {
- .bs-docs-sidebar {
- padding-left: 20px;
- }
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-
-/* All levels of nav */
-.bs-docs-sidebar .nav > li > a {
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-.bs-docs-sidebar .nav > li > a:hover,
-.bs-docs-sidebar .nav > li > a:focus {
- padding-left: 19px;
- color: #A1283B;
- text-decoration: none;
- background-color: transparent;
- border-left: 1px solid #A1283B;
-}
-.bs-docs-sidebar .nav > .active > a,
-.bs-docs-sidebar .nav > .active:hover > a,
-.bs-docs-sidebar .nav > .active:focus > a {
- padding-left: 18px;
- font-weight: bold;
- color: #A1283B;
- background-color: transparent;
- border-left: 2px solid #A1283B;
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-
-/* Nav: second level (shown on .active) */
-.bs-docs-sidebar .nav .nav {
- display: none; /* Hide by default, but at >768px, show it */
- padding-bottom: 10px;
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-.bs-docs-sidebar .nav .nav > li > a {
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-
-/* Show and affix the side nav when space allows it */
-@media (min-width: 992px) {
- .bs-docs-sidebar .nav > .active > ul {
- display: block;
- }
- /* Widen the fixed sidebar */
- .bs-docs-sidebar.affix,
- .bs-docs-sidebar.affix-bottom {
- width: 213px;
- }
- .bs-docs-sidebar.affix {
- position: fixed; /* Undo the static from mobile first approach */
- top: 20px;
- }
- .bs-docs-sidebar.affix-bottom {
- position: absolute; /* Undo the static from mobile first approach */
- }
- .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
- margin-top: 0;
- margin-bottom: 0
- }
-}
-@media (min-width: 1200px) {
- /* Widen the fixed sidebar again */
- .bs-docs-sidebar.affix-bottom,
- .bs-docs-sidebar.affix {
- width: 263px;
- }
-}
-</style>
-<script type="text/javascript">
-$(function() {
- 'use strict';
-
- $('.bs-docs-sidebar li').first().addClass('active');
-
- $(document.body).scrollspy({target: '.bs-docs-sidebar'});
-
- $('.bs-docs-sidebar').affix();
-});
-</script>
-</head>
-<body>
-<div id="content" class="container">
-<div class="row"><div class="col-md-9"><h1 class="title">USB desk fan modification</h1>
-
-<div id="outline-container-sec-1" class="outline-2">
-<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.
-</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.
-</li>
-
-<li>Authors:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko
-<ul class="org-ul">
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
-</li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-
-<li>Valeria Agejenko
-</li>
-</ul>
-</li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a>
-</li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-2" class="outline-2">
-<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-<p>
-End-result looks like this:
-</p>
-
-
-<figure>
-<p><img src="make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-
-<p>
-It all started with couple of cheap USB desk fans that were a bit too
-noisy:
-</p>
-
-
-<figure>
-<p><img src="mini%20fan.png" class="img-responsive" alt="mini%20fan.png">
-</p>
-</figure>
-
-<p>
-Idea is to add DC-DC step-down converter to reduce motor voltage to
-make it quieter (<a href="https://www.amazon.de/gp/product/B07K3W78SQ/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1">Purchased form here</a>). And since I already have this
-USB powered thing on my desk, why not to share this power to allow
-charging of various other USB powered devices.
-</p>
-
-<p>
-I ended up with this schematic:
-<img src="schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-
-<p>
-USB power of 5 volts that enters the system via DC jack is distributed
-to two USB-A connectors on the front panel. Note: USB data is not
-connected. Therefore this hub is for power sharing only.
-</p>
-
-<p>
-DC-DC fly-back converter could introduce voltage ripple in the
-system. To smooth it out, there is capacitor (C1) and inductor (L1).
-</p>
-
-<p>
-Step-down voltage converter has adjustable output voltage. So after
-assembling, it can be tuned with screw-driver to reach desired
-noise/airflow tradeoff.
-</p>
-
-<p>
-From original fan I kept:
-</p>
-<ul class="org-ul">
-<li>engine
-</li>
-<li>blades
-</li>
-<li>DC jack
-</li>
-<li>on/off swith
-</li>
-</ul>
-
-<p>
-Engine is attached with screws to following back-plate:
-</p>
-
-
-<figure>
-<p><img src="fan%20housing%20-%20fan%20mount.png" class="img-responsive" alt="fan%20housing%20-%20fan%20mount.png">
-</p>
-</figure>
-
-<p>
-And result is encased into pipelike case:
-</p>
-
-
-<figure>
-<p><img src="fan%20housing%20-%20cover%20assembly.png" class="img-responsive" alt="fan%20housing%20-%20cover%20assembly.png">
-</p>
-</figure>
-
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li>STL: <a href="fan%20housing%20-%20fan%20mount.stl">fan mount back plate</a>
-</li>
-<li>STL: <a href="fan%20housing%20-%20cover.stl">pipe-like case</a>
-</li>
-<li><a href="fan%20housing.FCStd">FreeCAD project</a>
-</li>
-</ul>
-
-<p>
-Fan enclosure attaches to the rectangular body below using following
-connector (glued to the fan housing):
-</p>
-
-
-<figure>
-<p><img src="fan%20housing%20connector.png" class="img-responsive" alt="fan%20housing%20connector.png">
-</p>
-</figure>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="fan%20housing%20connector.stl">STL file</a>
-</li>
-<li><a href="fan%20housing%20connector.FCStd">FreeCAD project</a>
-</li>
-</ul>
-
-<p>
-Bottom part to house 2 PCBs, on/off button and DC connector:
-<img src="bottom%20stand%20body.png" class="img-responsive" alt="bottom%20stand%20body.png">
-</p>
-
-<p>
-Component attachment:
-<img src="make,%202.png" class="img-responsive" alt="make,%202.png">
-</p>
-
-<p>
-And is closed by cover:
-<img src="bottom%20stand%20cover%20assembly.png" class="img-responsive" alt="bottom%20stand%20cover%20assembly.png">
-</p>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li>STL: <a href="bottom%20stand%20body.stl">bottom stand body</a>
-</li>
-<li>STL: <a href="bottom%20stand%20cover.stl">bottom%20stand%20cover.stl</a>
-</li>
-<li><a href="bottom%20stand.FCStd">FreeCAD project</a>
-</li>
-</ul>
-
-<p>
-After assembly, it looks like this from the back:
-<img src="make,%203.png" class="img-responsive" alt="make,%203.png">
-</p>
-
-<p>
-Note, part of the body is deformed during printing. I have heated bed
-and I even printed raft support in Cura and it did not help. In my
-experience black PLA filament is awful in comparison to transparent
-one. Has inferior flow (results in slower print speed) and tends to
-deform easily. Will never buy it again.
-</p>
-
-<p>
-Fan top and bottom halves are attached using <a href="https://www.amazon.de/gp/product/B00OOLKD2G/ref=ppx_yo_dt_b_asin_image_o00_s00?ie=UTF8&psc=1">camera tripod quick
-release screw</a>.
-</p>
-</div>
-</div>
-</div><div class="col-md-3"><nav id="table-of-contents">
-<div id="text-table-of-contents" class="bs-docs-sidebar">
-<ul class="nav">
-<li><a href="#sec-1">1. General</a></li>
-<li><a href="#sec-2">2. Project description</a></li>
-</ul>
-</div>
-</nav>
-</div></div></div>
-<footer id="postamble" class="">
-<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2020-08-10 Mon 07:18</p>
-<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
-</div>
-</footer>
-</body>
-</html>
+++ /dev/null
-#+TITLE: USB desk fan modification
-#+author: Svjatoslav Agejenko
-#+LANGUAGE: en
-
-* (document settings) :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD: footer {background-color: #111 !important;}
-#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Authors:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
- - Valeria Agejenko
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-End-result looks like this:
-
-[[file:make.png]]
-
-It all started with couple of cheap USB desk fans that were a bit too
-noisy:
-
-[[file:mini%20fan.png]]
-
-Idea is to add DC-DC step-down converter to reduce motor voltage to
-make it quieter ([[https://www.amazon.de/gp/product/B07K3W78SQ/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1][Purchased form here]]). And since I already have this
-USB powered thing on my desk, why not to share this power to allow
-charging of various other USB powered devices.
-
-I ended up with this schematic:
-[[file:schematic.png]]
-
-USB power of 5 volts that enters the system via DC jack is distributed
-to two USB-A connectors on the front panel. Note: USB data is not
-connected. Therefore this hub is for power sharing only.
-
-DC-DC fly-back converter could introduce voltage ripple in the
-system. To smooth it out, there is capacitor (C1) and inductor (L1).
-
-Step-down voltage converter has adjustable output voltage. So after
-assembling, it can be tuned with screw-driver to reach desired
-noise/airflow tradeoff.
-
-From original fan I kept:
-+ engine
-+ blades
-+ DC jack
-+ on/off swith
-
-Engine is attached with screws to following back-plate:
-
-[[file:fan%20housing%20-%20fan%20mount.png]]
-
-And result is encased into pipelike case:
-
-[[file:fan%20housing%20-%20cover%20assembly.png]]
-
-
-Download:
-+ STL: [[file:fan%20housing%20-%20fan%20mount.stl][fan mount back plate]]
-+ STL: [[file:fan%20housing%20-%20cover.stl][pipe-like case]]
-+ [[file:fan%20housing.FCStd][FreeCAD project]]
-
-Fan enclosure attaches to the rectangular body below using following
-connector (glued to the fan housing):
-
-[[file:fan%20housing%20connector.png]]
-
-Download:
-+ [[file:fan%20housing%20connector.stl][STL file]]
-+ [[file:fan%20housing%20connector.FCStd][FreeCAD project]]
-
-Bottom part to house 2 PCBs, on/off button and DC connector:
-[[file:bottom%20stand%20body.png]]
-
-Component attachment:
-[[file:make,%202.png]]
-
-And is closed by cover:
-[[file:bottom%20stand%20cover%20assembly.png]]
-
-Download:
-+ STL: [[file:bottom%20stand%20body.stl][bottom stand body]]
-+ STL: [[file:bottom%20stand%20cover.stl]]
-+ [[file:bottom%20stand.FCStd][FreeCAD project]]
-
-After assembly, it looks like this from the back:
-[[file:make,%203.png]]
-
-Note, part of the body is deformed during printing. I have heated bed
-and I even printed raft support in Cura and it did not help. In my
-experience black PLA filament is awful in comparison to transparent
-one. Has inferior flow (results in slower print speed) and tends to
-deform easily. Will never buy it again.
-
-Fan top and bottom halves are attached using [[https://www.amazon.de/gp/product/B00OOLKD2G/ref=ppx_yo_dt_b_asin_image_o00_s00?ie=UTF8&psc=1][camera tripod quick
-release screw]].
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 2 2
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-Text HLabel 3200 3150 0 50 Input ~ 0
-Vin
-Text HLabel 4050 3150 2 50 Output ~ 0
-Vout
-Text HLabel 3550 3500 0 50 UnSpc ~ 0
-GND
-$EndSCHEMATC
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 2 2
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-Text HLabel 3200 3150 0 50 Input ~ 0
-Vin
-Text HLabel 4050 3150 2 50 Output ~ 0
-Vout
-Text HLabel 3550 3500 0 50 UnSpc ~ 0
-GND
-$EndSCHEMATC
+++ /dev/null
-EESchema-LIBRARY Version 2.4
-#encoding utf-8
-#
-# Connector_Jack-DC
-#
-DEF Connector_Jack-DC J 0 40 Y Y 1 F N
-F0 "J" 0 210 50 H V C CNN
-F1 "Connector_Jack-DC" 0 -200 50 H V C CNN
-F2 "" 50 -40 50 H I C CNN
-F3 "" 50 -40 50 H I C CNN
-ALIAS Jack-DC
-$FPLIST
- BarrelJack*
-$ENDFPLIST
-DRAW
-A -130 100 25 901 -901 0 1 10 F -130 125 -130 75
-A -130 100 25 901 -901 0 1 10 N -130 125 -130 75
-S -200 150 200 -150 0 1 10 f
-S 145 125 -130 75 0 1 10 F
-P 2 0 1 10 200 100 150 100 N
-P 6 0 1 10 -150 -100 -100 -100 -50 -50 0 -100 100 -100 200 -100 N
-X ~ 1 300 100 100 L 50 50 1 1 P
-X ~ 2 300 -100 100 L 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Connector_USB_A
-#
-DEF Connector_USB_A J 0 40 Y Y 1 F N
-F0 "J" -200 450 50 H V L CNN
-F1 "Connector_USB_A" -200 350 50 H V L CNN
-F2 "" 150 -50 50 H I C CNN
-F3 "" 150 -50 50 H I C CNN
-$FPLIST
- USB*
-$ENDFPLIST
-DRAW
-C -150 85 25 0 1 10 F
-C -25 135 15 0 1 10 F
-S -200 -300 200 300 0 1 10 f
-S -60 190 -170 210 0 1 0 F
-S -50 180 -180 230 0 1 0 N
-S -5 -300 5 -270 0 1 0 N
-S 10 50 -20 20 0 1 10 F
-S 200 -105 170 -95 0 1 0 N
-S 200 -5 170 5 0 1 0 N
-S 200 195 170 205 0 1 0 N
-P 4 0 1 10 -125 85 -100 85 -50 135 -25 135 N
-P 4 0 1 10 -100 85 -75 85 -50 35 0 35 N
-P 4 0 1 10 25 110 25 60 75 85 25 110 F
-P 2 1 1 10 -75 85 25 85 N
-X VBUS 1 300 200 100 L 50 50 1 1 W
-X D- 2 300 -100 100 L 50 50 1 1 P
-X D+ 3 300 0 100 L 50 50 1 1 P
-X GND 4 0 -400 100 U 50 50 1 1 W
-X Shield 5 -100 -400 100 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_C
-#
-DEF Device_C C 0 10 N Y 1 F N
-F0 "C" 25 100 50 H V L CNN
-F1 "Device_C" 25 -100 50 H V L CNN
-F2 "" 38 -150 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-$FPLIST
- C_*
-$ENDFPLIST
-DRAW
-P 2 0 1 20 -80 -30 80 -30 N
-P 2 0 1 20 -80 30 80 30 N
-X ~ 1 0 150 110 D 50 50 1 1 P
-X ~ 2 0 -150 110 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_L
-#
-DEF Device_L L 0 40 N N 1 F N
-F0 "L" -50 0 50 V V C CNN
-F1 "Device_L" 75 0 50 V V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-$FPLIST
- Choke_*
- *Coil*
- Inductor_*
- L_*
-$ENDFPLIST
-DRAW
-A 0 -75 25 -899 899 0 1 0 N 0 -100 0 -50
-A 0 -25 25 -899 899 0 1 0 N 0 -50 0 0
-A 0 25 25 -899 899 0 1 0 N 0 0 0 50
-A 0 75 25 -899 899 0 1 0 N 0 50 0 100
-X 1 1 0 150 50 D 50 50 1 1 P
-X 2 2 0 -150 50 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Motor_Fan
-#
-DEF Motor_Fan M 0 0 Y Y 1 F N
-F0 "M" 100 200 50 H V L CNN
-F1 "Motor_Fan" 100 -100 50 H V L TNN
-F2 "" 0 10 50 H I C CNN
-F3 "" 0 10 50 H I C CNN
-$FPLIST
- PinHeader*P2.54mm*
- TerminalBlock*
-$ENDFPLIST
-DRAW
-A -98 94 113 297 -910 0 1 0 N 0 150 -100 -20
-A 0 -70 112 1534 266 0 1 0 N -100 -20 100 -20
-A 103 95 115 -915 1519 0 1 0 N 100 -20 0 150
-C 0 40 128 0 1 10 N
-P 2 0 1 0 0 -200 0 -180 N
-P 2 0 1 0 0 -88 0 -104 N
-P 2 0 1 0 0 168 0 182 N
-P 2 0 1 0 0 180 0 200 N
-X + 1 0 300 100 D 50 50 1 1 P
-X - 2 0 -200 100 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Switch_SW_SPST
-#
-DEF Switch_SW_SPST SW 0 0 Y N 1 F N
-F0 "SW" 0 125 50 H V C CNN
-F1 "Switch_SW_SPST" 0 -100 50 H V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-DRAW
-C -80 0 20 0 0 0 N
-C 80 0 20 0 0 0 N
-P 2 0 0 0 -60 10 60 70 N
-X A 1 -200 0 100 R 50 50 1 1 P
-X B 2 200 0 100 L 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# power_GND
-#
-DEF power_GND #PWR 0 0 Y Y 1 F P
-F0 "#PWR" 0 -250 50 H I C CNN
-F1 "power_GND" 0 -150 50 H V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-DRAW
-P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
-X GND 1 0 0 0 D 50 50 1 1 W N
-ENDDRAW
-ENDDEF
-#
-#End Library
+++ /dev/null
-(kicad_pcb (version 4) (host kicad "dummy file") )
+++ /dev/null
-update=22/05/2015 07:44:53
-version=1
-last_client=kicad
-[general]
-version=1
-RootSch=
-BoardNm=
-[pcbnew]
-version=1
-LastNetListRead=
-UseCmpFile=1
-PadDrill=0.600000000000
-PadDrillOvalY=0.600000000000
-PadSizeH=1.500000000000
-PadSizeV=1.500000000000
-PcbTextSizeV=1.500000000000
-PcbTextSizeH=1.500000000000
-PcbTextThickness=0.300000000000
-ModuleTextSizeV=1.000000000000
-ModuleTextSizeH=1.000000000000
-ModuleTextSizeThickness=0.150000000000
-SolderMaskClearance=0.000000000000
-SolderMaskMinWidth=0.000000000000
-DrawSegmentWidth=0.200000000000
-BoardOutlineThickness=0.100000000000
-ModuleOutlineThickness=0.150000000000
-[cvpcb]
-version=1
-NetIExt=net
-[eeschema]
-version=1
-LibDir=
-[eeschema/libraries]
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 1 2
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Comp
-L Connector:Jack-DC J1
-U 1 1 5F2FD982
-P 5800 2250
-F 0 "J1" H 5857 2575 50 0000 C CNN
-F 1 "Jack-DC" H 5857 2484 50 0000 C CNN
-F 2 "" H 5850 2210 50 0001 C CNN
-F 3 "~" H 5850 2210 50 0001 C CNN
- 1 5800 2250
- 1 0 0 -1
-$EndComp
-$Comp
-L Connector:USB_A J3
-U 1 1 5F2FEA01
-P 5800 3000
-F 0 "J3" H 5857 3467 50 0000 C CNN
-F 1 "USB_A" H 5857 3376 50 0000 C CNN
-F 2 "" H 5950 2950 50 0001 C CNN
-F 3 " ~" H 5950 2950 50 0001 C CNN
- 1 5800 3000
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:L L1
-U 1 1 5F300800
-P 6600 2400
-F 0 "L1" V 6419 2400 50 0000 C CNN
-F 1 "L" V 6510 2400 50 0000 C CNN
-F 2 "" H 6600 2400 50 0001 C CNN
-F 3 "~" H 6600 2400 50 0001 C CNN
- 1 6600 2400
- 1 0 0 -1
-$EndComp
-$Comp
-L Switch:SW_SPST SW1
-U 1 1 5F301417
-P 6600 3100
-F 0 "SW1" H 6600 3335 50 0000 C CNN
-F 1 "SW_SPST" H 6600 3244 50 0000 C CNN
-F 2 "" H 6600 3100 50 0001 C CNN
-F 3 "~" H 6600 3100 50 0001 C CNN
- 1 6600 3100
- 0 -1 -1 0
-$EndComp
-$Sheet
-S 6750 3150 850 450
-U 5F3090BB
-F0 "DCDC stepdown" 50
-F1 "DCDC_stepdown.sch" 50
-F2 "Vin" I L 6750 3300 50
-F3 "Vout" O R 7600 3300 50
-F4 "GND" U R 7600 3500 50
-$EndSheet
-Wire Wire Line
- 7600 3500 7750 3500
-Wire Wire Line
- 7750 3500 7750 3900
-$Comp
-L Motor:Fan M1
-U 1 1 5F30D281
-P 8000 3650
-F 0 "M1" H 8158 3746 50 0000 L CNN
-F 1 "Fan" H 8158 3655 50 0000 L CNN
-F 2 "" H 8000 3660 50 0001 C CNN
-F 3 "~" H 8000 3660 50 0001 C CNN
- 1 8000 3650
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 8000 3850 8000 3900
-Wire Wire Line
- 8000 3900 7750 3900
-Wire Wire Line
- 8000 3350 8000 3300
-Wire Wire Line
- 8000 3300 7600 3300
-Wire Wire Line
- 6600 3300 6750 3300
-$Comp
-L Connector:USB_A J2
-U 1 1 5F2FDD54
-P 5800 4050
-F 0 "J2" H 5857 4517 50 0000 C CNN
-F 1 "USB_A" H 5857 4426 50 0000 C CNN
-F 2 "" H 5950 4000 50 0001 C CNN
-F 3 " ~" H 5950 4000 50 0001 C CNN
- 1 5800 4050
- 1 0 0 -1
-$EndComp
-$Comp
-L power:GND #PWR05
-U 1 1 5F33C53A
-P 7750 4000
-F 0 "#PWR05" H 7750 3750 50 0001 C CNN
-F 1 "GND" H 7755 3827 50 0000 C CNN
-F 2 "" H 7750 4000 50 0001 C CNN
-F 3 "" H 7750 4000 50 0001 C CNN
- 1 7750 4000
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 7750 3900 7750 4000
-Connection ~ 7750 3900
-$Comp
-L power:GND #PWR03
-U 1 1 5F340A00
-P 6100 2500
-F 0 "#PWR03" H 6100 2250 50 0001 C CNN
-F 1 "GND" H 6105 2327 50 0000 C CNN
-F 2 "" H 6100 2500 50 0001 C CNN
-F 3 "" H 6100 2500 50 0001 C CNN
- 1 6100 2500
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 6100 2500 6100 2350
-Wire Wire Line
- 6100 2150 6350 2150
-Wire Wire Line
- 6350 2150 6350 2800
-Wire Wire Line
- 6100 2800 6350 2800
-Connection ~ 6350 2800
-$Comp
-L power:GND #PWR01
-U 1 1 5F3100AA
-P 5800 3500
-F 0 "#PWR01" H 5800 3250 50 0001 C CNN
-F 1 "GND" H 5805 3327 50 0000 C CNN
-F 2 "" H 5800 3500 50 0001 C CNN
-F 3 "" H 5800 3500 50 0001 C CNN
- 1 5800 3500
- 1 0 0 -1
-$EndComp
-$Comp
-L power:GND #PWR02
-U 1 1 5F3104D0
-P 5800 4550
-F 0 "#PWR02" H 5800 4300 50 0001 C CNN
-F 1 "GND" H 5805 4377 50 0000 C CNN
-F 2 "" H 5800 4550 50 0001 C CNN
-F 3 "" H 5800 4550 50 0001 C CNN
- 1 5800 4550
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5800 3500 5800 3400
-Wire Wire Line
- 5800 4550 5800 4450
-Wire Wire Line
- 6350 2150 6600 2150
-Wire Wire Line
- 6600 2150 6600 2250
-Connection ~ 6350 2150
-Wire Wire Line
- 6600 2900 6600 2550
-Wire Wire Line
- 6100 3850 6350 3850
-Wire Wire Line
- 6350 2800 6350 3850
-$Comp
-L Device:C C1
-U 1 1 5F321361
-P 6350 4150
-F 0 "C1" H 6465 4196 50 0000 L CNN
-F 1 "C" H 6465 4105 50 0000 L CNN
-F 2 "" H 6388 4000 50 0001 C CNN
-F 3 "~" H 6350 4150 50 0001 C CNN
- 1 6350 4150
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 6350 4000 6350 3850
-Connection ~ 6350 3850
-$Comp
-L power:GND #PWR04
-U 1 1 5F321B30
-P 6350 4450
-F 0 "#PWR04" H 6350 4200 50 0001 C CNN
-F 1 "GND" H 6355 4277 50 0000 C CNN
-F 2 "" H 6350 4450 50 0001 C CNN
-F 3 "" H 6350 4450 50 0001 C CNN
- 1 6350 4450
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 6350 4450 6350 4300
-$EndSCHEMATC
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 1 2
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Comp
-L Connector:Jack-DC J1
-U 1 1 5F2FD982
-P 5800 2250
-F 0 "J1" H 5857 2575 50 0000 C CNN
-F 1 "Jack-DC" H 5857 2484 50 0000 C CNN
-F 2 "" H 5850 2210 50 0001 C CNN
-F 3 "~" H 5850 2210 50 0001 C CNN
- 1 5800 2250
- 1 0 0 -1
-$EndComp
-$Comp
-L Connector:USB_A J3
-U 1 1 5F2FEA01
-P 6800 3250
-F 0 "J3" H 6857 3717 50 0000 C CNN
-F 1 "USB_A" H 6857 3626 50 0000 C CNN
-F 2 "" H 6950 3200 50 0001 C CNN
-F 3 " ~" H 6950 3200 50 0001 C CNN
- 1 6800 3250
- -1 0 0 1
-$EndComp
-Wire Wire Line
- 6250 3250 6500 3250
-$Comp
-L Device:L L1
-U 1 1 5F300800
-P 6750 2150
-F 0 "L1" V 6569 2150 50 0000 C CNN
-F 1 "L" V 6660 2150 50 0000 C CNN
-F 2 "" H 6750 2150 50 0001 C CNN
-F 3 "~" H 6750 2150 50 0001 C CNN
- 1 6750 2150
- 0 1 1 0
-$EndComp
-$Comp
-L Switch:SW_SPST SW1
-U 1 1 5F301417
-P 6950 2450
-F 0 "SW1" H 6950 2685 50 0000 C CNN
-F 1 "SW_SPST" H 6950 2594 50 0000 C CNN
-F 2 "" H 6950 2450 50 0001 C CNN
-F 3 "~" H 6950 2450 50 0001 C CNN
- 1 6950 2450
- 0 -1 -1 0
-$EndComp
-Wire Wire Line
- 6600 2150 6400 2150
-$Sheet
-S 7100 2500 850 450
-U 5F3090BB
-F0 "DCDC stepdown" 50
-F1 "DCDC_stepdown.sch" 50
-F2 "Vin" I L 7100 2650 50
-F3 "Vout" O R 7950 2650 50
-F4 "GND" U R 7950 2850 50
-$EndSheet
-Wire Wire Line
- 7950 2850 8100 2850
-Wire Wire Line
- 8100 2850 8100 3250
-$Comp
-L Device:C C1
-U 1 1 5F30C054
-P 6400 2700
-F 0 "C1" H 6515 2746 50 0000 L CNN
-F 1 "C" H 6515 2655 50 0000 L CNN
-F 2 "" H 6438 2550 50 0001 C CNN
-F 3 "~" H 6400 2700 50 0001 C CNN
- 1 6400 2700
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 6400 2550 6400 2150
-$Comp
-L Motor:Fan M1
-U 1 1 5F30D281
-P 8350 3000
-F 0 "M1" H 8508 3096 50 0000 L CNN
-F 1 "Fan" H 8508 3005 50 0000 L CNN
-F 2 "" H 8350 3010 50 0001 C CNN
-F 3 "~" H 8350 3010 50 0001 C CNN
- 1 8350 3000
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 8350 3200 8350 3250
-Wire Wire Line
- 8350 3250 8100 3250
-Wire Wire Line
- 8350 2700 8350 2650
-Wire Wire Line
- 8350 2650 7950 2650
-Wire Wire Line
- 6950 2250 6950 2150
-Wire Wire Line
- 6950 2150 6900 2150
-Wire Wire Line
- 6950 2650 7100 2650
-$Comp
-L Connector:USB_A J2
-U 1 1 5F2FDD54
-P 6800 4200
-F 0 "J2" H 6857 4667 50 0000 C CNN
-F 1 "USB_A" H 6857 4576 50 0000 C CNN
-F 2 "" H 6950 4150 50 0001 C CNN
-F 3 " ~" H 6950 4150 50 0001 C CNN
- 1 6800 4200
- -1 0 0 1
-$EndComp
-Wire Wire Line
- 6500 4100 6400 4100
-Wire Wire Line
- 6250 4200 6250 3250
-Wire Wire Line
- 6250 4200 6500 4200
-Wire Wire Line
- 6250 2150 6400 2150
-Connection ~ 6250 3250
-Connection ~ 6400 2150
-$Comp
-L power:GND #PWR?
-U 1 1 5F33C53A
-P 8100 3350
-F 0 "#PWR?" H 8100 3100 50 0001 C CNN
-F 1 "GND" H 8105 3177 50 0000 C CNN
-F 2 "" H 8100 3350 50 0001 C CNN
-F 3 "" H 8100 3350 50 0001 C CNN
- 1 8100 3350
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 8100 3250 8100 3350
-Connection ~ 8100 3250
-$Comp
-L power:GND #PWR?
-U 1 1 5F340A00
-P 6100 2500
-F 0 "#PWR?" H 6100 2250 50 0001 C CNN
-F 1 "GND" H 6105 2327 50 0000 C CNN
-F 2 "" H 6100 2500 50 0001 C CNN
-F 3 "" H 6100 2500 50 0001 C CNN
- 1 6100 2500
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 6100 2500 6100 2350
-Wire Wire Line
- 6100 2150 6250 2150
-Connection ~ 6250 2150
-Wire Wire Line
- 6250 2150 6250 3250
-$Comp
-L power:GND #PWR?
-U 1 1 5F34448E
-P 6400 4300
-F 0 "#PWR?" H 6400 4050 50 0001 C CNN
-F 1 "GND" H 6405 4127 50 0000 C CNN
-F 2 "" H 6400 4300 50 0001 C CNN
-F 3 "" H 6400 4300 50 0001 C CNN
- 1 6400 4300
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 6400 4300 6400 4100
-$Comp
-L power:GND #PWR?
-U 1 1 5F344A85
-P 6400 3350
-F 0 "#PWR?" H 6400 3100 50 0001 C CNN
-F 1 "GND" H 6405 3177 50 0000 C CNN
-F 2 "" H 6400 3350 50 0001 C CNN
-F 3 "" H 6400 3350 50 0001 C CNN
- 1 6400 3350
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 6400 3350 6400 3150
-Wire Wire Line
- 6400 3150 6500 3150
-Wire Wire Line
- 6400 2850 6400 3150
-Connection ~ 6400 3150
-$EndSCHEMATC
+++ /dev/null
-EESchema-LIBRARY Version 2.4
-#encoding utf-8
-#
-# Connector_USB_A
-#
-DEF Connector_USB_A J 0 40 Y Y 1 F N
-F0 "J" -200 450 50 H V L CNN
-F1 "Connector_USB_A" -200 350 50 H V L CNN
-F2 "" 150 -50 50 H I C CNN
-F3 "" 150 -50 50 H I C CNN
-$FPLIST
- USB*
-$ENDFPLIST
-DRAW
-C -150 85 25 0 1 10 F
-C -25 135 15 0 1 10 F
-S -200 -300 200 300 0 1 10 f
-S -60 190 -170 210 0 1 0 F
-S -50 180 -180 230 0 1 0 N
-S -5 -300 5 -270 0 1 0 N
-S 10 50 -20 20 0 1 10 F
-S 200 -105 170 -95 0 1 0 N
-S 200 -5 170 5 0 1 0 N
-S 200 195 170 205 0 1 0 N
-P 4 0 1 10 -125 85 -100 85 -50 135 -25 135 N
-P 4 0 1 10 -100 85 -75 85 -50 35 0 35 N
-P 4 0 1 10 25 110 25 60 75 85 25 110 F
-P 2 1 1 10 -75 85 25 85 N
-X VBUS 1 300 200 100 L 50 50 1 1 W
-X D- 2 300 -100 100 L 50 50 1 1 P
-X D+ 3 300 0 100 L 50 50 1 1 P
-X GND 4 0 -400 100 U 50 50 1 1 W
-X Shield 5 -100 -400 100 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_Lamp
-#
-DEF Device_Lamp LA 0 1 N N 1 F N
-F0 "LA" 25 150 50 H V L CNN
-F1 "Device_Lamp" 25 -150 50 H V L CNN
-F2 "" 0 100 50 V I C CNN
-F3 "" 0 100 50 V I C CNN
-DRAW
-C 0 0 100 0 1 0 N
-P 2 0 1 0 -70 70 70 -70 N
-P 2 0 1 0 70 70 -70 -70 N
-X - 1 0 -200 100 U 50 50 1 1 P
-X + 2 0 200 100 D 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_R
-#
-DEF Device_R R 0 0 N Y 1 F N
-F0 "R" 80 0 50 V V C CNN
-F1 "Device_R" 0 0 50 V V C CNN
-F2 "" -70 0 50 V I C CNN
-F3 "" 0 0 50 H I C CNN
-$FPLIST
- R_*
-$ENDFPLIST
-DRAW
-S -40 -100 40 100 0 1 10 N
-X ~ 1 0 150 50 D 50 50 1 1 P
-X ~ 2 0 -150 50 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Switch_SW_SPST
-#
-DEF Switch_SW_SPST SW 0 0 Y N 1 F N
-F0 "SW" 0 125 50 H V C CNN
-F1 "Switch_SW_SPST" 0 -100 50 H V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-DRAW
-C -80 0 20 0 0 0 N
-C 80 0 20 0 0 0 N
-P 2 0 0 0 -60 10 60 70 N
-X A 1 -200 0 100 R 50 50 1 1 P
-X B 2 200 0 100 L 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-#End Library
+++ /dev/null
-(kicad_pcb (version 4) (host kicad "dummy file") )
+++ /dev/null
-update=22/05/2015 07:44:53
-version=1
-last_client=kicad
-[general]
-version=1
-RootSch=
-BoardNm=
-[pcbnew]
-version=1
-LastNetListRead=
-UseCmpFile=1
-PadDrill=0.600000000000
-PadDrillOvalY=0.600000000000
-PadSizeH=1.500000000000
-PadSizeV=1.500000000000
-PcbTextSizeV=1.500000000000
-PcbTextSizeH=1.500000000000
-PcbTextThickness=0.300000000000
-ModuleTextSizeV=1.000000000000
-ModuleTextSizeH=1.000000000000
-ModuleTextSizeThickness=0.150000000000
-SolderMaskClearance=0.000000000000
-SolderMaskMinWidth=0.000000000000
-DrawSegmentWidth=0.200000000000
-BoardOutlineThickness=0.100000000000
-ModuleOutlineThickness=0.150000000000
-[cvpcb]
-version=1
-NetIExt=net
-[eeschema]
-version=1
-LibDir=
-[eeschema/libraries]
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 1 1
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Comp
-L Connector:USB_A J1
-U 1 1 5F4101A8
-P 4150 3000
-F 0 "J1" H 4207 3467 50 0000 C CNN
-F 1 "USB_A" H 4207 3376 50 0000 C CNN
-F 2 "" H 4300 2950 50 0001 C CNN
-F 3 " ~" H 4300 2950 50 0001 C CNN
- 1 4150 3000
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4450 3100 4550 3100
-Wire Wire Line
- 4550 3000 4450 3000
-$Comp
-L Switch:SW_SPST SW3
-U 1 1 5F410F20
-P 4750 4400
-F 0 "SW3" H 4750 4635 50 0000 C CNN
-F 1 "SW_SPST" H 4750 4544 50 0000 C CNN
-F 2 "" H 4750 4400 50 0001 C CNN
-F 3 "~" H 4750 4400 50 0001 C CNN
- 1 4750 4400
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R2
-U 1 1 5F411557
-P 4750 4650
-F 0 "R2" V 4543 4650 50 0000 C CNN
-F 1 "8" V 4634 4650 50 0000 C CNN
-F 2 "" V 4680 4650 50 0001 C CNN
-F 3 "~" H 4750 4650 50 0001 C CNN
- 1 4750 4650
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 4550 4400 4550 4650
-Wire Wire Line
- 4550 4650 4600 4650
-$Comp
-L Switch:SW_SPST SW6
-U 1 1 5F4130F6
-P 5250 4400
-F 0 "SW6" H 5250 4635 50 0000 C CNN
-F 1 "SW_SPST" H 5250 4544 50 0000 C CNN
-F 2 "" H 5250 4400 50 0001 C CNN
-F 3 "~" H 5250 4400 50 0001 C CNN
- 1 5250 4400
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R4
-U 1 1 5F413100
-P 5250 4650
-F 0 "R4" V 5043 4650 50 0000 C CNN
-F 1 "4" V 5134 4650 50 0000 C CNN
-F 2 "" V 5180 4650 50 0001 C CNN
-F 3 "~" H 5250 4650 50 0001 C CNN
- 1 5250 4650
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 5000 4650 5100 4650
-Wire Wire Line
- 4950 4400 5000 4400
-Wire Wire Line
- 5000 4400 5000 4650
-Connection ~ 5000 4400
-Wire Wire Line
- 5000 4400 5050 4400
-Wire Wire Line
- 4900 4650 5000 4650
-Connection ~ 5000 4650
-$Comp
-L Switch:SW_SPST SW9
-U 1 1 5F416C6C
-P 5750 4400
-F 0 "SW9" H 5750 4635 50 0000 C CNN
-F 1 "SW_SPST" H 5750 4544 50 0000 C CNN
-F 2 "" H 5750 4400 50 0001 C CNN
-F 3 "~" H 5750 4400 50 0001 C CNN
- 1 5750 4400
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R6
-U 1 1 5F416C76
-P 5750 4650
-F 0 "R6" V 5543 4650 50 0000 C CNN
-F 1 "2" V 5634 4650 50 0000 C CNN
-F 2 "" V 5680 4650 50 0001 C CNN
-F 3 "~" H 5750 4650 50 0001 C CNN
- 1 5750 4650
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 5500 4650 5600 4650
-Wire Wire Line
- 5450 4400 5500 4400
-Wire Wire Line
- 5500 4400 5500 4650
-Connection ~ 5500 4400
-Wire Wire Line
- 5500 4400 5550 4400
-Wire Wire Line
- 5400 4650 5500 4650
-Connection ~ 5500 4650
-$Comp
-L Switch:SW_SPST SW12
-U 1 1 5F41B671
-P 6250 4400
-F 0 "SW12" H 6250 4635 50 0000 C CNN
-F 1 "SW_SPST" H 6250 4544 50 0000 C CNN
-F 2 "" H 6250 4400 50 0001 C CNN
-F 3 "~" H 6250 4400 50 0001 C CNN
- 1 6250 4400
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R8
-U 1 1 5F41B67B
-P 6250 4650
-F 0 "R8" V 6043 4650 50 0000 C CNN
-F 1 "1" V 6134 4650 50 0000 C CNN
-F 2 "" V 6180 4650 50 0001 C CNN
-F 3 "~" H 6250 4650 50 0001 C CNN
- 1 6250 4650
- 0 1 1 0
-$EndComp
-$Comp
-L Switch:SW_SPST SW15
-U 1 1 5F41B686
-P 6750 4400
-F 0 "SW15" H 6750 4635 50 0000 C CNN
-F 1 "SW_SPST" H 6750 4544 50 0000 C CNN
-F 2 "" H 6750 4400 50 0001 C CNN
-F 3 "~" H 6750 4400 50 0001 C CNN
- 1 6750 4400
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R11
-U 1 1 5F41B690
-P 6750 4650
-F 0 "R11" V 6543 4650 50 0000 C CNN
-F 1 "0.5" V 6634 4650 50 0000 C CNN
-F 2 "" V 6680 4650 50 0001 C CNN
-F 3 "~" H 6750 4650 50 0001 C CNN
- 1 6750 4650
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 6500 4650 6600 4650
-Wire Wire Line
- 6450 4400 6500 4400
-Wire Wire Line
- 6500 4400 6500 4650
-Connection ~ 6500 4400
-Wire Wire Line
- 6500 4400 6550 4400
-Wire Wire Line
- 6400 4650 6500 4650
-Connection ~ 6500 4650
-Wire Wire Line
- 6950 4400 7000 4400
-Wire Wire Line
- 7000 4400 7000 4650
-Wire Wire Line
- 6900 4650 7000 4650
-Wire Wire Line
- 5900 4650 6000 4650
-Wire Wire Line
- 5950 4400 6000 4400
-Wire Wire Line
- 6000 4400 6000 4650
-Connection ~ 6000 4400
-Wire Wire Line
- 6000 4400 6050 4400
-Connection ~ 6000 4650
-Wire Wire Line
- 6000 4650 6100 4650
-$Comp
-L Switch:SW_SPST SW2
-U 1 1 5F42FD9A
-P 4750 3550
-F 0 "SW2" H 4750 3785 50 0000 C CNN
-F 1 "SW_SPST" H 4750 3694 50 0000 C CNN
-F 2 "" H 4750 3550 50 0001 C CNN
-F 3 "~" H 4750 3550 50 0001 C CNN
- 1 4750 3550
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R1
-U 1 1 5F42FDA4
-P 4750 3800
-F 0 "R1" V 4543 3800 50 0000 C CNN
-F 1 "256" V 4634 3800 50 0000 C CNN
-F 2 "" V 4680 3800 50 0001 C CNN
-F 3 "~" H 4750 3800 50 0001 C CNN
- 1 4750 3800
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 4550 3550 4550 3800
-Wire Wire Line
- 4550 3800 4600 3800
-$Comp
-L Switch:SW_SPST SW5
-U 1 1 5F42FDB0
-P 5250 3550
-F 0 "SW5" H 5250 3785 50 0000 C CNN
-F 1 "SW_SPST" H 5250 3694 50 0000 C CNN
-F 2 "" H 5250 3550 50 0001 C CNN
-F 3 "~" H 5250 3550 50 0001 C CNN
- 1 5250 3550
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R3
-U 1 1 5F42FDBA
-P 5250 3800
-F 0 "R3" V 5043 3800 50 0000 C CNN
-F 1 "128" V 5134 3800 50 0000 C CNN
-F 2 "" V 5180 3800 50 0001 C CNN
-F 3 "~" H 5250 3800 50 0001 C CNN
- 1 5250 3800
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 5000 3800 5100 3800
-Wire Wire Line
- 4950 3550 5000 3550
-Wire Wire Line
- 5000 3550 5000 3800
-Connection ~ 5000 3550
-Wire Wire Line
- 5000 3550 5050 3550
-Wire Wire Line
- 4900 3800 5000 3800
-Connection ~ 5000 3800
-$Comp
-L Switch:SW_SPST SW8
-U 1 1 5F42FDCB
-P 5750 3550
-F 0 "SW8" H 5750 3785 50 0000 C CNN
-F 1 "SW_SPST" H 5750 3694 50 0000 C CNN
-F 2 "" H 5750 3550 50 0001 C CNN
-F 3 "~" H 5750 3550 50 0001 C CNN
- 1 5750 3550
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R5
-U 1 1 5F42FDD5
-P 5750 3800
-F 0 "R5" V 5543 3800 50 0000 C CNN
-F 1 "64" V 5634 3800 50 0000 C CNN
-F 2 "" V 5680 3800 50 0001 C CNN
-F 3 "~" H 5750 3800 50 0001 C CNN
- 1 5750 3800
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 5500 3800 5600 3800
-Wire Wire Line
- 5450 3550 5500 3550
-Wire Wire Line
- 5500 3550 5500 3800
-Connection ~ 5500 3550
-Wire Wire Line
- 5500 3550 5550 3550
-Wire Wire Line
- 5400 3800 5500 3800
-Connection ~ 5500 3800
-$Comp
-L Switch:SW_SPST SW11
-U 1 1 5F42FDE6
-P 6250 3550
-F 0 "SW11" H 6250 3785 50 0000 C CNN
-F 1 "SW_SPST" H 6250 3694 50 0000 C CNN
-F 2 "" H 6250 3550 50 0001 C CNN
-F 3 "~" H 6250 3550 50 0001 C CNN
- 1 6250 3550
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R7
-U 1 1 5F42FDF0
-P 6250 3800
-F 0 "R7" V 6043 3800 50 0000 C CNN
-F 1 "32" V 6134 3800 50 0000 C CNN
-F 2 "" V 6180 3800 50 0001 C CNN
-F 3 "~" H 6250 3800 50 0001 C CNN
- 1 6250 3800
- 0 1 1 0
-$EndComp
-$Comp
-L Switch:SW_SPST SW14
-U 1 1 5F42FDFA
-P 6750 3550
-F 0 "SW14" H 6750 3785 50 0000 C CNN
-F 1 "SW_SPST" H 6750 3694 50 0000 C CNN
-F 2 "" H 6750 3550 50 0001 C CNN
-F 3 "~" H 6750 3550 50 0001 C CNN
- 1 6750 3550
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R10
-U 1 1 5F42FE04
-P 6750 3800
-F 0 "R10" V 6543 3800 50 0000 C CNN
-F 1 "16" V 6634 3800 50 0000 C CNN
-F 2 "" V 6680 3800 50 0001 C CNN
-F 3 "~" H 6750 3800 50 0001 C CNN
- 1 6750 3800
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 6500 3800 6600 3800
-Wire Wire Line
- 6450 3550 6500 3550
-Wire Wire Line
- 6500 3550 6500 3800
-Connection ~ 6500 3550
-Wire Wire Line
- 6500 3550 6550 3550
-Wire Wire Line
- 6400 3800 6500 3800
-Connection ~ 6500 3800
-Wire Wire Line
- 6950 3550 7000 3550
-Wire Wire Line
- 7000 3550 7000 3800
-Wire Wire Line
- 6900 3800 7000 3800
-Wire Wire Line
- 5900 3800 6000 3800
-Wire Wire Line
- 5950 3550 6000 3550
-Wire Wire Line
- 6000 3550 6000 3800
-Connection ~ 6000 3550
-Wire Wire Line
- 6000 3550 6050 3550
-Connection ~ 6000 3800
-Wire Wire Line
- 6000 3800 6100 3800
-$Comp
-L Switch:SW_SPST SW1
-U 1 1 5F4459DA
-P 4750 2750
-F 0 "SW1" H 4750 2985 50 0000 C CNN
-F 1 "SW_SPST" H 4750 2894 50 0000 C CNN
-F 2 "" H 4750 2750 50 0001 C CNN
-F 3 "~" H 4750 2750 50 0001 C CNN
- 1 4750 2750
- 1 0 0 -1
-$EndComp
-$Comp
-L Switch:SW_SPST SW4
-U 1 1 5F4459F0
-P 5250 2750
-F 0 "SW4" H 5250 2985 50 0000 C CNN
-F 1 "SW_SPST" H 5250 2894 50 0000 C CNN
-F 2 "" H 5250 2750 50 0001 C CNN
-F 3 "~" H 5250 2750 50 0001 C CNN
- 1 5250 2750
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4950 2750 5000 2750
-Wire Wire Line
- 5000 2750 5000 3000
-Connection ~ 5000 2750
-Wire Wire Line
- 5000 2750 5050 2750
-$Comp
-L Switch:SW_SPST SW7
-U 1 1 5F445A0B
-P 5750 2750
-F 0 "SW7" H 5750 2985 50 0000 C CNN
-F 1 "SW_SPST" H 5750 2894 50 0000 C CNN
-F 2 "" H 5750 2750 50 0001 C CNN
-F 3 "~" H 5750 2750 50 0001 C CNN
- 1 5750 2750
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 5450 2750 5500 2750
-Wire Wire Line
- 5500 2750 5500 3000
-Connection ~ 5500 2750
-Wire Wire Line
- 5500 2750 5550 2750
-$Comp
-L Switch:SW_SPST SW10
-U 1 1 5F445A26
-P 6250 2750
-F 0 "SW10" H 6250 2985 50 0000 C CNN
-F 1 "SW_SPST" H 6250 2894 50 0000 C CNN
-F 2 "" H 6250 2750 50 0001 C CNN
-F 3 "~" H 6250 2750 50 0001 C CNN
- 1 6250 2750
- 1 0 0 -1
-$EndComp
-$Comp
-L Switch:SW_SPST SW13
-U 1 1 5F445A3A
-P 6750 2750
-F 0 "SW13" H 6750 2985 50 0000 C CNN
-F 1 "SW_SPST" H 6750 2894 50 0000 C CNN
-F 2 "" H 6750 2750 50 0001 C CNN
-F 3 "~" H 6750 2750 50 0001 C CNN
- 1 6750 2750
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R9
-U 1 1 5F445A44
-P 6750 3000
-F 0 "R9" V 6543 3000 50 0000 C CNN
-F 1 "512" V 6634 3000 50 0000 C CNN
-F 2 "" V 6680 3000 50 0001 C CNN
-F 3 "~" H 6750 3000 50 0001 C CNN
- 1 6750 3000
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 6500 3000 6600 3000
-Wire Wire Line
- 6450 2750 6500 2750
-Wire Wire Line
- 6500 2750 6500 3000
-Connection ~ 6500 2750
-Wire Wire Line
- 6500 2750 6550 2750
-Wire Wire Line
- 6950 2750 7000 2750
-Wire Wire Line
- 7000 2750 7000 3000
-Wire Wire Line
- 6900 3000 7000 3000
-Wire Wire Line
- 5950 2750 6000 2750
-Wire Wire Line
- 6000 2750 6000 3000
-Connection ~ 6000 2750
-Wire Wire Line
- 6000 2750 6050 2750
-$Comp
-L Device:Lamp LA4
-U 1 1 5F459AA3
-P 6250 3000
-F 0 "LA4" V 5985 3000 50 0000 C CNN
-F 1 "Lamp" V 6076 3000 50 0000 C CNN
-F 2 "" V 6250 3100 50 0001 C CNN
-F 3 "~" V 6250 3100 50 0001 C CNN
- 1 6250 3000
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 6450 3000 6500 3000
-Connection ~ 6500 3000
-Wire Wire Line
- 6050 3000 6000 3000
-$Comp
-L Device:Lamp LA3
-U 1 1 5F48104F
-P 5750 3000
-F 0 "LA3" V 5485 3000 50 0000 C CNN
-F 1 "Lamp" V 5576 3000 50 0000 C CNN
-F 2 "" V 5750 3100 50 0001 C CNN
-F 3 "~" V 5750 3100 50 0001 C CNN
- 1 5750 3000
- 0 1 1 0
-$EndComp
-$Comp
-L Device:Lamp LA2
-U 1 1 5F4819AC
-P 5250 3000
-F 0 "LA2" V 4985 3000 50 0000 C CNN
-F 1 "Lamp" V 5076 3000 50 0000 C CNN
-F 2 "" V 5250 3100 50 0001 C CNN
-F 3 "~" V 5250 3100 50 0001 C CNN
- 1 5250 3000
- 0 1 1 0
-$EndComp
-$Comp
-L Device:Lamp LA1
-U 1 1 5F482195
-P 4750 3000
-F 0 "LA1" V 4485 3000 50 0000 C CNN
-F 1 "Lamp" V 4576 3000 50 0000 C CNN
-F 2 "" V 4750 3100 50 0001 C CNN
-F 3 "~" V 4750 3100 50 0001 C CNN
- 1 4750 3000
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 4950 3000 5000 3000
-Wire Wire Line
- 5000 3000 5050 3000
-Connection ~ 5000 3000
-Wire Wire Line
- 5450 3000 5500 3000
-Wire Wire Line
- 5500 3000 5550 3000
-Connection ~ 5500 3000
-Wire Wire Line
- 5950 3000 6000 3000
-Connection ~ 6000 3000
-Wire Wire Line
- 4550 4400 4550 4000
-Wire Wire Line
- 4550 4000 7000 4000
-Wire Wire Line
- 7000 4000 7000 3800
-Connection ~ 4550 4400
-Connection ~ 7000 3800
-Wire Wire Line
- 4550 3550 4550 3200
-Wire Wire Line
- 4550 3200 7000 3200
-Wire Wire Line
- 7000 3200 7000 3000
-Connection ~ 4550 3550
-Connection ~ 7000 3000
-Wire Wire Line
- 4550 3100 4550 3000
-Wire Wire Line
- 4550 3000 4550 2750
-Wire Wire Line
- 7000 4900 7000 4650
-Connection ~ 7000 4650
-Connection ~ 4550 3000
-Wire Wire Line
- 7000 4900 4050 4900
-Wire Wire Line
- 4050 4900 4050 3400
-$EndSCHEMATC
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 1 1
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Comp
-L Connector:USB_A J1
-U 1 1 5F4101A8
-P 3850 3350
-F 0 "J1" H 3907 3817 50 0000 C CNN
-F 1 "USB_A" H 3907 3726 50 0000 C CNN
-F 2 "" H 4000 3300 50 0001 C CNN
-F 3 " ~" H 4000 3300 50 0001 C CNN
- 1 3850 3350
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 4150 3450 4250 3450
-Wire Wire Line
- 4250 3350 4150 3350
-$Comp
-L Switch:SW_SPST SW3
-U 1 1 5F410F20
-P 4750 4400
-F 0 "SW3" H 4750 4635 50 0000 C CNN
-F 1 "SW_SPST" H 4750 4544 50 0000 C CNN
-F 2 "" H 4750 4400 50 0001 C CNN
-F 3 "~" H 4750 4400 50 0001 C CNN
- 1 4750 4400
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R2
-U 1 1 5F411557
-P 4750 4650
-F 0 "R2" V 4543 4650 50 0000 C CNN
-F 1 "8" V 4634 4650 50 0000 C CNN
-F 2 "" V 4680 4650 50 0001 C CNN
-F 3 "~" H 4750 4650 50 0001 C CNN
- 1 4750 4650
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 4550 4400 4550 4650
-Wire Wire Line
- 4550 4650 4600 4650
-$Comp
-L Switch:SW_SPST SW6
-U 1 1 5F4130F6
-P 5250 4400
-F 0 "SW6" H 5250 4635 50 0000 C CNN
-F 1 "SW_SPST" H 5250 4544 50 0000 C CNN
-F 2 "" H 5250 4400 50 0001 C CNN
-F 3 "~" H 5250 4400 50 0001 C CNN
- 1 5250 4400
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R4
-U 1 1 5F413100
-P 5250 4650
-F 0 "R4" V 5043 4650 50 0000 C CNN
-F 1 "4" V 5134 4650 50 0000 C CNN
-F 2 "" V 5180 4650 50 0001 C CNN
-F 3 "~" H 5250 4650 50 0001 C CNN
- 1 5250 4650
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 5000 4650 5100 4650
-Wire Wire Line
- 4950 4400 5000 4400
-Wire Wire Line
- 5000 4400 5000 4650
-Connection ~ 5000 4400
-Wire Wire Line
- 5000 4400 5050 4400
-Wire Wire Line
- 4900 4650 5000 4650
-Connection ~ 5000 4650
-$Comp
-L Switch:SW_SPST SW9
-U 1 1 5F416C6C
-P 5750 4400
-F 0 "SW9" H 5750 4635 50 0000 C CNN
-F 1 "SW_SPST" H 5750 4544 50 0000 C CNN
-F 2 "" H 5750 4400 50 0001 C CNN
-F 3 "~" H 5750 4400 50 0001 C CNN
- 1 5750 4400
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R6
-U 1 1 5F416C76
-P 5750 4650
-F 0 "R6" V 5543 4650 50 0000 C CNN
-F 1 "2" V 5634 4650 50 0000 C CNN
-F 2 "" V 5680 4650 50 0001 C CNN
-F 3 "~" H 5750 4650 50 0001 C CNN
- 1 5750 4650
- 0 1 1 0
-$EndComp
-Wire Wire Line
- 5500 4650 5600 4650
-Wire Wire Line
- 5450 4400 5500 4400
-Wire Wire Line
- 5500 4400 5500 4650
-Connection ~ 5500 4400
-Wire Wire Line
- 5500 4400 5550 4400
-Wire Wire Line
- 5400 4650 5500 4650
-Connection ~ 5500 4650
-$Comp
-L Switch:SW_SPST SW12
-U 1 1 5F41B671
-P 6250 4400
-F 0 "SW12" H 6250 4635 50 0000 C CNN
-F 1 "SW_SPST" H 6250 4544 50 0000 C CNN
-F 2 "" H 6250 4400 50 0001 C CNN
-F 3 "~" H 6250 4400 50 0001 C CNN
- 1 6250 4400
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R8
-U 1 1 5F41B67B
-P 6250 4650
-F 0 "R8" V 6043 4650 50 0000 C CNN
-F 1 "1" V 6134 4650 50 0000 C CNN
-F 2 "" V 6180 4650 50 0001 C CNN
-F 3 "~" H 6250 4650 50 0001 C CNN
- 1 6250 4650
- 0 1 1 0
-$EndComp
-$Comp
-L Switch:SW_SPST SW15
-U 1 1 5F41B686
-P 6750 4400
-F 0 "SW15" H 6750 4635 50 0000 C CNN
-F 1 "SW_SPST" H 6750 4544 50 0000 C CNN
-F 2 "" H 6750 4400 50 0001 C CNN
-F 3 "~" H 6750 4400 50 0001 C CNN
- 1 6750 4400
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R11
-U 1 1 5F41B690
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-<body>
-<div id="content" class="container">
-<div class="row"><div class="col-md-9"><h1 class="title">Adjustable resistor / indicator</h1>
-
-<div id="outline-container-sec-1" class="outline-2">
-<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.
-</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.
-</li>
-
-<li>Author:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko
-<ul class="org-ul">
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
-</li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-</ul>
-</li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a>
-</li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-2" class="outline-2">
-<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-<p>
-I needed a way to experimentally find resistance that works best in
-certain circuits. Usual potentiometers could not handle required power
-dissipation and were not precise enough.
-</p>
-
-<p>
-Solution is to build adjustable resistor:
-</p>
-
-
-<figure>
-<p><img src="make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-
-<p>
-Logically there is series of resistors that increase in resistance in
-the power of 2: 0.5, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512. Each
-resistor can be enabled or disabled by a switch. This makes entire
-range of 0 – 1023.5 ohms available with the 0.5 ohms precision.
-</p>
-
-<p>
-Schematic:
-<img src="schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-
-<p>
-Here is front panel for switches:
-<img src="front%20panel.png" class="img-responsive" alt="front%20panel.png">
-</p>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="front%20panel.FCStd">FreeCAD project</a>
-</li>
-<li><a href="front%20panel.stl">STL file</a>
-</li>
-</ul>
-
-<p>
-Sometimes I would like to use lightbulbs with various parameters as
-test load/indicator. Current device has 4 of them included.
-</p>
-
-<p>
-Here is front panel for light bulbs:
-<img src="indicator%20panel.png" class="img-responsive" alt="indicator%20panel.png">
-</p>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="indicator%20panel.FCStd">FreeCAD project</a>
-</li>
-<li><a href="indicator%20panel.stl">STL file</a>
-</li>
-</ul>
-
-
-<p>
-After assembly using prototype PCB:
-<img src="make,%202.png" class="img-responsive" alt="make,%202.png">
-</p>
-
-
-<p>
-Following body is used as a case and PCB support:
-<img src="body.png" class="img-responsive" alt="body.png">
-</p>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="body%20and%20back%20cover.FCStd">FreeCAD project (body + back cover)</a>
-</li>
-<li><a href="body.stl">STL file for body</a>
-</li>
-</ul>
-
-<p>
-Result:
-<img src="make,%203.png" class="img-responsive" alt="make,%203.png">
-</p>
-
-<p>
-Cover on the back:
-<img src="back%20cover.png" class="img-responsive" alt="back%20cover.png">
-</p>
-
-<p>
-Download: <a href="back%20cover.stl">STL file</a>
-</p>
-
-<p>
-Button covers:
-<img src="button.png" class="img-responsive" alt="button.png">
-</p>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="button.FCStd">FreeCAD project</a>
-</li>
-<li><a href="button.stl">STL file</a>
-</li>
-</ul>
-</div>
-</div>
-</div><div class="col-md-3"><nav id="table-of-contents">
-<div id="text-table-of-contents" class="bs-docs-sidebar">
-<ul class="nav">
-<li><a href="#sec-1">1. General</a></li>
-<li><a href="#sec-2">2. Project description</a></li>
-</ul>
-</div>
-</nav>
-</div></div></div>
-<footer id="postamble" class="">
-<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2020-08-22 L 15:39</p>
-<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
-</div>
-</footer>
-</body>
-</html>
+++ /dev/null
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-#+AUTHOR: Svjatoslav Agejenko
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-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD: footer {background-color: #111 !important;}
-#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Author:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-I needed a way to experimentally find resistance that works best in
-certain circuits. Usual potentiometers could not handle required power
-dissipation and were not precise enough.
-
-Solution is to build adjustable resistor:
-
-[[file:make.png]]
-
-Logically there is series of resistors that increase in resistance in
-the power of 2: 0.5, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512. Each
-resistor can be enabled or disabled by a switch. This makes entire
-range of 0 -- 1023.5 ohms available with the 0.5 ohms precision.
-
-Schematic:
-[[file:schematic.png]]
-
-Here is front panel for switches:
-[[file:front%20panel.png]]
-
-Download:
-+ [[file:front%20panel.FCStd][FreeCAD project]]
-+ [[file:front%20panel.stl][STL file]]
-
-Sometimes I would like to use lightbulbs with various parameters as
-test load/indicator. Current device has 4 of them included.
-
-Here is front panel for light bulbs:
-[[file:indicator%20panel.png]]
-
-Download:
-+ [[file:indicator%20panel.FCStd][FreeCAD project]]
-+ [[file:indicator%20panel.stl][STL file]]
-
-
-After assembly using prototype PCB:
-[[file:make,%202.png]]
-
-
-Following body is used as a case and PCB support:
-[[file:body.png]]
-
-Download:
-+ [[file:body%20and%20back%20cover.FCStd][FreeCAD project (body + back cover)]]
-+ [[file:body.stl][STL file for body]]
-
-Result:
-[[file:make,%203.png]]
-
-Cover on the back:
-[[file:back%20cover.png]]
-
-Download: [[file:back%20cover.stl][STL file]]
-
-Button covers:
-[[file:button.png]]
-
-Download:
-+ [[file:button.FCStd][FreeCAD project]]
-+ [[file:button.stl][STL file]]
+++ /dev/null
-<!doctype html>
-<html lang="en">
-<head>
-<title>Alternative (and incompatible) layout for USB connectors</title>
-<!-- 2021-01-03 P 00:30 -->
-<meta charset="utf-8">
-<meta name="viewport" content="width=device-width, initial-scale=1">
-<meta name="generator" content="Org-mode">
-<meta name="author" content="Svjatoslav Agejenko">
-<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-<style type="text/css">
-footer {background-color: #111 !important;}
-pre {background-color: #111; color: #ccc;}
-</style>
-<style type="text/css">
-/* org mode styles on top of twbs */
-
-html {
- position: relative;
- min-height: 100%;
-}
-
-body {
- font-size: 18px;
- margin-bottom: 105px;
-}
-
-footer {
- position: absolute;
- bottom: 0;
- width: 100%;
- height: 101px;
- background-color: #f5f5f5;
-}
-
-footer > div {
- padding: 10px;
-}
-
-footer p {
- margin: 0 0 5px;
- text-align: center;
- font-size: 16px;
-}
-
-#table-of-contents {
- margin-top: 20px;
- margin-bottom: 20px;
-}
-
-blockquote p {
- font-size: 18px;
-}
-
-pre {
- font-size: 16px;
-}
-
-.footpara {
- display: inline-block;
-}
-
-figcaption {
- font-size: 16px;
- color: #666;
- font-style: italic;
- padding-bottom: 15px;
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-
-/* from twbs docs */
-
-.bs-docs-sidebar.affix {
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-.bs-docs-sidebar .nav > li > a {
- display: block;
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-.bs-docs-sidebar .nav > li > a:focus {
- padding-left: 19px;
- color: #A1283B;
- text-decoration: none;
- background-color: transparent;
- border-left: 1px solid #A1283B;
-}
-.bs-docs-sidebar .nav > .active > a,
-.bs-docs-sidebar .nav > .active:hover > a,
-.bs-docs-sidebar .nav > .active:focus > a {
- padding-left: 18px;
- font-weight: bold;
- color: #A1283B;
- background-color: transparent;
- border-left: 2px solid #A1283B;
-}
-
-/* Nav: second level (shown on .active) */
-.bs-docs-sidebar .nav .nav {
- display: none; /* Hide by default, but at >768px, show it */
- padding-bottom: 10px;
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-.bs-docs-sidebar .nav .nav > li > a {
- padding-top: 1px;
- padding-bottom: 1px;
- padding-left: 30px;
- font-size: 12px;
- font-weight: normal;
-}
-.bs-docs-sidebar .nav .nav > li > a:hover,
-.bs-docs-sidebar .nav .nav > li > a:focus {
- padding-left: 29px;
-}
-.bs-docs-sidebar .nav .nav > .active > a,
-.bs-docs-sidebar .nav .nav > .active:hover > a,
-.bs-docs-sidebar .nav .nav > .active:focus > a {
- padding-left: 28px;
- font-weight: 500;
-}
-
-/* Nav: third level (shown on .active) */
-.bs-docs-sidebar .nav .nav .nav {
- padding-bottom: 10px;
-}
-.bs-docs-sidebar .nav .nav .nav > li > a {
- padding-top: 1px;
- padding-bottom: 1px;
- padding-left: 40px;
- font-size: 12px;
- font-weight: normal;
-}
-.bs-docs-sidebar .nav .nav .nav > li > a:hover,
-.bs-docs-sidebar .nav .nav .nav > li > a:focus {
- padding-left: 39px;
-}
-.bs-docs-sidebar .nav .nav .nav > .active > a,
-.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
-.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
- padding-left: 38px;
- font-weight: 500;
-}
-
-/* Show and affix the side nav when space allows it */
-@media (min-width: 992px) {
- .bs-docs-sidebar .nav > .active > ul {
- display: block;
- }
- /* Widen the fixed sidebar */
- .bs-docs-sidebar.affix,
- .bs-docs-sidebar.affix-bottom {
- width: 213px;
- }
- .bs-docs-sidebar.affix {
- position: fixed; /* Undo the static from mobile first approach */
- top: 20px;
- }
- .bs-docs-sidebar.affix-bottom {
- position: absolute; /* Undo the static from mobile first approach */
- }
- .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
- margin-top: 0;
- margin-bottom: 0
- }
-}
-@media (min-width: 1200px) {
- /* Widen the fixed sidebar again */
- .bs-docs-sidebar.affix-bottom,
- .bs-docs-sidebar.affix {
- width: 263px;
- }
-}
-</style>
-<script type="text/javascript">
-$(function() {
- 'use strict';
-
- $('.bs-docs-sidebar li').first().addClass('active');
-
- $(document.body).scrollspy({target: '.bs-docs-sidebar'});
-
- $('.bs-docs-sidebar').affix();
-});
-</script>
-</head>
-<body>
-<div id="content" class="container">
-<div class="row"><div class="col-md-9"><h1 class="title">Alternative (and incompatible) layout for USB connectors</h1>
-
-<div id="outline-container-sec-1" class="outline-2">
-<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.
-</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.
-</li>
-
-<li>Authors:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko
-<ul class="org-ul">
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
-</li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-
-<li>Valeria Agejenko
-</li>
-</ul>
-</li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a>
-</li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-2" class="outline-2">
-<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-<p>
-<b>Warning!</b> Here I describe a hack that I personally found useful for
-my own needs. But it is dangerous. Not to be replicated unless you
-know that you are doing.
-</p>
-
-
-
-<figure>
-<p><img src="make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-
-<p>
-I needed a way to power various devices I build.
-</p>
-
-<p>
-Requirements:
-</p>
-
-<ul class="org-ul">
-<li>Reliable.
-</li>
-<li>Cheap.
-</li>
-<li>Easy to use.
-</li>
-<li>Popular and highly available.
-</li>
-<li>Ability to draw significant current directly from 12V cheap, popular
-and powerful lead-acid battery (optionally off-grid). Useful for
-powerful electric motors, heaters, soldering irons, radio
-transmitters, etc.
-</li>
-<li>Ability to draw limited but stabilized 5V power. Good for digital
-circuits.
-</li>
-<li>Ability to have limited and simple 1-wire digital communication.
-</li>
-</ul>
-
-<p>
-USB Type A connectors are best match that I found.
-</p>
-
-<p>
-The main problem is, I like USB connectors but I want to use different
-and incompatible electrical layout with them.
-</p>
-
-<p>
-<b>Connecting proper USB power supplies, devices and even cables to the
-ones that use alternative electrical layout would do damage!!!</b>
-</p>
-
-<p>
-To avoid accidental mismatches, I mark all connectors/cables and devices that
-use alternative wiring with <a href="stickers.png">printed, laminated warning stickers</a>.
-</p>
-
-<p>
-Alternative wiring schematic:
-<img src="schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-
-<ul class="org-ul">
-<li>Outer shell is ground.
-</li>
-<li>2 central pins are re-purposed to deliver +12V and high power.
-</li>
-<li>1 pin is for limited power +5V.
-</li>
-<li>1 pin for 1-Wire data.
-</li>
-</ul>
-
-
-<p>
-Example warning marking on device to indicate that alternative USB
-layout is used here:
-</p>
-
-
-<figure>
-<p><img src="../lab%20heater%20and%20cooler/make,%202.png" class="img-responsive" alt="make,%202.png">
-</p>
-</figure>
-</div>
-</div>
-</div><div class="col-md-3"><nav id="table-of-contents">
-<div id="text-table-of-contents" class="bs-docs-sidebar">
-<ul class="nav">
-<li><a href="#sec-1">1. General</a></li>
-<li><a href="#sec-2">2. Project description</a></li>
-</ul>
-</div>
-</nav>
-</div></div></div>
-<footer id="postamble" class="">
-<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2021-01-03 P 00:30</p>
-<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
-</div>
-</footer>
-</body>
-</html>
+++ /dev/null
-#+TITLE: Alternative (and incompatible) layout for USB connectors
-#+author: Svjatoslav Agejenko
-#+LANGUAGE: en
-
-* (document settings) :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD: footer {background-color: #111 !important;}
-#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Authors:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
- - Valeria Agejenko
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-
-*Warning!* Here I describe a hack that I personally found useful for
-my own needs. But it is dangerous. Not to be replicated unless you
-know that you are doing.
-
-
-[[file:make.png]]
-
-I needed a way to power various devices I build.
-
-Requirements:
-
-- Reliable.
-- Cheap.
-- Easy to use.
-- Popular and highly available.
-- Ability to draw significant current directly from 12V cheap, popular
- and powerful lead-acid battery (optionally off-grid). Useful for
- powerful electric motors, heaters, soldering irons, radio
- transmitters, etc.
-- Ability to draw limited but stabilized 5V power. Good for digital
- circuits.
-- Ability to have limited and simple 1-wire digital communication.
-
-USB Type A connectors are best match that I found.
-
-The main problem is, I like USB connectors but I want to use different
-and incompatible electrical layout with them.
-
-*Connecting proper USB power supplies, devices and even cables to the
-ones that use alternative electrical layout would do damage!!!*
-
-To avoid accidental mismatches, I mark all connectors/cables and devices that
-use alternative wiring with [[file:stickers.png][printed, laminated warning stickers]].
-
-Alternative wiring schematic:
-[[file:schematic.png]]
-
-- Outer shell is ground.
-- 2 central pins are re-purposed to deliver +12V and high power.
-- 1 pin is for limited power +5V.
-- 1 pin for 1-Wire data.
-
-
-Example warning marking on device to indicate that alternative USB
-layout is used here:
-
-[[file:../lab%20heater%20and%20cooler/make,%202.png]]
+++ /dev/null
-<!doctype html>
-<html lang="en">
-<head>
-<title>AA and AAA battery tester</title>
-<!-- 2020-05-24 P 23:55 -->
-<meta charset="utf-8">
-<meta name="viewport" content="width=device-width, initial-scale=1">
-<meta name="generator" content="Org-mode">
-<meta name="author" content="Svjatoslav Agejenko">
-<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-<style type="text/css">
-footer {background-color: #111 !important;}
-pre {background-color: #111; color: #ccc;}
-</style>
-<style type="text/css">
-/* org mode styles on top of twbs */
-
-html {
- position: relative;
- min-height: 100%;
-}
-
-body {
- font-size: 18px;
- margin-bottom: 105px;
-}
-
-footer {
- position: absolute;
- bottom: 0;
- width: 100%;
- height: 101px;
- background-color: #f5f5f5;
-}
-
-footer > div {
- padding: 10px;
-}
-
-footer p {
- margin: 0 0 5px;
- text-align: center;
- font-size: 16px;
-}
-
-#table-of-contents {
- margin-top: 20px;
- margin-bottom: 20px;
-}
-
-blockquote p {
- font-size: 18px;
-}
-
-pre {
- font-size: 16px;
-}
-
-.footpara {
- display: inline-block;
-}
-
-figcaption {
- font-size: 16px;
- color: #666;
- font-style: italic;
- padding-bottom: 15px;
-}
-
-/* from twbs docs */
-
-.bs-docs-sidebar.affix {
- position: static;
-}
-@media (min-width: 768px) {
- .bs-docs-sidebar {
- padding-left: 20px;
- }
-}
-
-/* All levels of nav */
-.bs-docs-sidebar .nav > li > a {
- display: block;
- padding: 4px 20px;
- font-size: 14px;
- font-weight: 500;
- color: #999;
-}
-.bs-docs-sidebar .nav > li > a:hover,
-.bs-docs-sidebar .nav > li > a:focus {
- padding-left: 19px;
- color: #A1283B;
- text-decoration: none;
- background-color: transparent;
- border-left: 1px solid #A1283B;
-}
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-.bs-docs-sidebar .nav > .active:hover > a,
-.bs-docs-sidebar .nav > .active:focus > a {
- padding-left: 18px;
- font-weight: bold;
- color: #A1283B;
- background-color: transparent;
- border-left: 2px solid #A1283B;
-}
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-.bs-docs-sidebar .nav .nav {
- display: none; /* Hide by default, but at >768px, show it */
- padding-bottom: 10px;
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- padding-bottom: 1px;
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-.bs-docs-sidebar .nav .nav > li > a:focus {
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-.bs-docs-sidebar .nav .nav > .active > a,
-.bs-docs-sidebar .nav .nav > .active:hover > a,
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- padding-bottom: 10px;
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-@media (min-width: 992px) {
- .bs-docs-sidebar .nav > .active > ul {
- display: block;
- }
- /* Widen the fixed sidebar */
- .bs-docs-sidebar.affix,
- .bs-docs-sidebar.affix-bottom {
- width: 213px;
- }
- .bs-docs-sidebar.affix {
- position: fixed; /* Undo the static from mobile first approach */
- top: 20px;
- }
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- position: absolute; /* Undo the static from mobile first approach */
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- .bs-docs-sidebar.affix {
- width: 263px;
- }
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-</style>
-<script type="text/javascript">
-$(function() {
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-
- $('.bs-docs-sidebar li').first().addClass('active');
-
- $(document.body).scrollspy({target: '.bs-docs-sidebar'});
-
- $('.bs-docs-sidebar').affix();
-});
-</script>
-</head>
-<body>
-<div id="content" class="container">
-<div class="row"><div class="col-md-9"><h1 class="title">AA and AAA battery tester</h1>
-
-<div id="outline-container-sec-1" class="outline-2">
-<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.
-</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.
-</li>
-
-<li>Author:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko
-</li>
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
-</li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a>
-</li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-2" class="outline-2">
-<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-
-<figure>
-<p><img src="make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-
-
-<figure>
-<p><img src="make,%202.png" class="img-responsive" alt="make,%202.png">
-</p>
-</figure>
-
-<p>
-Simple rechargeable Ni-MH battery tester. The problem with those
-batteries is: right after you take them out of charger, voltage level
-at their terminals is good. But some old batteries will get
-empty/discharged way too quickly under normal load. This device is
-intended to discover old batteries with reduced capacity.
-</p>
-
-<p>
-Freshly charged batteries are tested under high load for short time by
-shorting battery + and - terminals using 5 ohm power resistor
-(R1). Simultaneously battery voltage is being measured while under
-load.
-</p>
-
-
-<figure>
-<p><img src="electrical%20schematic.png" class="img-responsive" alt="electrical%20schematic.png">
-</p>
-</figure>
-
-<p>
-I use vintage analog voltmeter. Instead of power resistor I use
-Nichrome resistance wire. Test/measurement button should not be
-pressed for long because power resistor gets hot quickly and battery
-is being quickly depleted during measurement.
-</p>
-
-
-<figure>
-<p><img src="assembly.png" class="img-responsive" alt="assembly.png">
-</p>
-</figure>
-
-<ul class="org-ul">
-<li>Body: <img src="body.png" class="img-responsive" alt="body.png">
-</li>
-<li>Cover: <img src="cover.png" class="img-responsive" alt="cover.png">
-</li>
-
-<li>Download:
-<ul class="org-ul">
-<li><a href="bodyAndCover.FCStd">FreeCAD project</a>
-</li>
-<li><a href="body.stl">body STL file</a>
-</li>
-<li><a href="cover.stl">cover STL file</a>
-</li>
-</ul>
-</li>
-
-<li>PS: While this device is interesting to build, still you can just
-use ordinary ammeter that can handle battery generated current.
-</li>
-</ul>
-</div>
-</div>
-</div><div class="col-md-3"><nav id="table-of-contents">
-<div id="text-table-of-contents" class="bs-docs-sidebar">
-<ul class="nav">
-<li><a href="#sec-1">1. General</a></li>
-<li><a href="#sec-2">2. Project description</a></li>
-</ul>
-</div>
-</nav>
-</div></div></div>
-<footer id="postamble" class="">
-<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2020-05-24 P 23:55</p>
-<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
-</div>
-</footer>
-</body>
-</html>
+++ /dev/null
-#+TITLE: AA and AAA battery tester
-#+AUTHOR: Svjatoslav Agejenko
-#+LANGUAGE: en
-
-* (document settings) :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD: footer {background-color: #111 !important;}
-#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Author:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-[[file:make.png]]
-
-[[file:make,%202.png]]
-
-Simple rechargeable Ni-MH battery tester. The problem with those
-batteries is: right after you take them out of charger, voltage level
-at their terminals is good. But some old batteries will get
-empty/discharged way too quickly under normal load. This device is
-intended to discover old batteries with reduced capacity.
-
-Freshly charged batteries are tested under high load for short time by
-shorting battery + and - terminals using 5 ohm power resistor
-(R1). Simultaneously battery voltage is being measured while under
-load.
-
-[[file:electrical%20schematic.png]]
-
-I use vintage analog voltmeter. Instead of power resistor I use
-Nichrome resistance wire. Test/measurement button should not be
-pressed for long because power resistor gets hot quickly and battery
-is being quickly depleted during measurement.
-
-[[file:assembly.png]]
-
-+ Body: [[file:body.png]]
-+ Cover: [[file:cover.png]]
-
-+ Download:
- + [[file:bodyAndCover.FCStd][FreeCAD project]]
- + [[file:body.stl][body STL file]]
- + [[file:cover.stl][cover STL file]]
-
-+ PS: While this device is interesting to build, still you can just
- use ordinary ammeter that can handle battery generated current.
+++ /dev/null
-EESchema-LIBRARY Version 2.4
-#encoding utf-8
-#
-# Device_Battery
-#
-DEF Device_Battery BT 0 0 N N 1 F N
-F0 "BT" 100 100 50 H V L CNN
-F1 "Device_Battery" 100 0 50 H V L CNN
-F2 "" 0 60 50 V I C CNN
-F3 "" 0 60 50 V I C CNN
-DRAW
-S -80 -55 80 -65 0 1 0 F
-S -80 70 80 60 0 1 0 F
-S -52 -78 50 -98 0 1 0 F
-S -52 47 50 27 0 1 0 F
-P 2 0 1 0 0 -60 0 -50 N
-P 2 0 1 0 0 -40 0 -30 N
-P 2 0 1 0 0 -20 0 -10 N
-P 2 0 1 0 0 0 0 10 N
-P 2 0 1 0 0 20 0 30 N
-P 2 0 1 0 0 70 0 100 N
-P 2 0 1 10 10 105 50 105 N
-P 2 0 1 10 30 125 30 85 N
-X + 1 0 200 100 D 50 50 1 1 P
-X - 2 0 -200 100 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_R
-#
-DEF Device_R R 0 0 N Y 1 F N
-F0 "R" 80 0 50 V V C CNN
-F1 "Device_R" 0 0 50 V V C CNN
-F2 "" -70 0 50 V I C CNN
-F3 "" 0 0 50 H I C CNN
-$FPLIST
- R_*
-$ENDFPLIST
-DRAW
-S -40 -100 40 100 0 1 10 N
-X ~ 1 0 150 50 D 50 50 1 1 P
-X ~ 2 0 -150 50 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_R_POT
-#
-DEF Device_R_POT RV 0 40 Y N 1 F N
-F0 "RV" -175 0 50 V V C CNN
-F1 "Device_R_POT" -100 0 50 V V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-$FPLIST
- Potentiometer*
-$ENDFPLIST
-DRAW
-S 40 100 -40 -100 0 1 10 N
-P 2 0 1 0 100 0 60 0 N
-P 4 0 1 0 45 0 90 20 90 -20 45 0 F
-X 1 1 0 150 50 D 50 50 1 1 P
-X 2 2 150 0 50 L 50 50 1 1 P
-X 3 3 0 -150 50 U 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Device_Voltmeter_DC
-#
-DEF Device_Voltmeter_DC MES 0 1 N N 1 F N
-F0 "MES" -130 40 50 H V R CNN
-F1 "Device_Voltmeter_DC" -130 -30 50 H V R CNN
-F2 "" 0 100 50 V I C CNN
-F3 "" 0 100 50 V I C CNN
-DRAW
-C 0 0 100 0 1 10 N
-T 0 0 0 100 0 0 0 V Normal 0 C C
-P 2 0 0 0 -125 -125 -75 -75 N
-P 2 0 0 0 75 75 125 125 N
-P 3 0 0 0 75 125 125 125 125 75 N
-P 2 0 1 0 10 150 30 150 N
-P 2 0 1 0 20 160 20 140 N
-X - 1 0 -200 100 U 50 50 1 1 P
-X + 2 0 200 100 D 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-# Switch_SW_SPST
-#
-DEF Switch_SW_SPST SW 0 0 Y N 1 F N
-F0 "SW" 0 125 50 H V C CNN
-F1 "Switch_SW_SPST" 0 -100 50 H V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-DRAW
-C -80 0 20 0 0 0 N
-C 80 0 20 0 0 0 N
-P 2 0 0 0 -60 10 60 70 N
-X A 1 -200 0 100 R 50 50 1 1 P
-X B 2 200 0 100 L 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
-#End Library
+++ /dev/null
-EESchema Schematic File Version 4
-EELAYER 30 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 1 1
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Comp
-L Device:Battery BT1
-U 1 1 5EC97EC8
-P 2600 3750
-F 0 "BT1" H 2708 3796 50 0000 L CNN
-F 1 "Battery" H 2708 3705 50 0000 L CNN
-F 2 "" V 2600 3810 50 0001 C CNN
-F 3 "~" V 2600 3810 50 0001 C CNN
- 1 2600 3750
- 1 0 0 -1
-$EndComp
-$Comp
-L Switch:SW_SPST SW1
-U 1 1 5EC98542
-P 3100 3250
-F 0 "SW1" H 3100 3485 50 0000 C CNN
-F 1 "SW_SPST" H 3100 3394 50 0000 C CNN
-F 2 "" H 3100 3250 50 0001 C CNN
-F 3 "~" H 3100 3250 50 0001 C CNN
- 1 3100 3250
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R1
-U 1 1 5EC98B01
-P 3550 3700
-F 0 "R1" H 3620 3746 50 0000 L CNN
-F 1 "5" H 3620 3655 50 0000 L CNN
-F 2 "" V 3480 3700 50 0001 C CNN
-F 3 "~" H 3550 3700 50 0001 C CNN
- 1 3550 3700
- 1 0 0 -1
-$EndComp
-$Comp
-L Device:R R2
-U 1 1 5EC98F38
-P 3850 3250
-F 0 "R2" V 3643 3250 50 0000 C CNN
-F 1 "3k" V 3734 3250 50 0000 C CNN
-F 2 "" V 3780 3250 50 0001 C CNN
-F 3 "~" H 3850 3250 50 0001 C CNN
- 1 3850 3250
- 0 1 1 0
-$EndComp
-$Comp
-L Device:R_POT RV1
-U 1 1 5EC99ABB
-P 4350 3250
-F 0 "RV1" V 4143 3250 50 0000 C CNN
-F 1 "3k3" V 4234 3250 50 0000 C CNN
-F 2 "" H 4350 3250 50 0001 C CNN
-F 3 "~" H 4350 3250 50 0001 C CNN
- 1 4350 3250
- 0 1 1 0
-$EndComp
-$Comp
-L Device:Voltmeter_DC MES1
-U 1 1 5EC9A7E7
-P 4350 3750
-F 0 "MES1" H 4503 3796 50 0000 L CNN
-F 1 "Voltmeter_DC" H 4503 3705 50 0000 L CNN
-F 2 "" V 4350 3850 50 0001 C CNN
-F 3 "~" V 4350 3850 50 0001 C CNN
- 1 4350 3750
- 1 0 0 -1
-$EndComp
-Wire Wire Line
- 2600 3550 2600 3250
-Wire Wire Line
- 2600 3250 2900 3250
-Wire Wire Line
- 3300 3250 3550 3250
-Wire Wire Line
- 4000 3250 4200 3250
-Wire Wire Line
- 4350 3400 4350 3550
-Wire Wire Line
- 4350 3950 4350 4100
-Wire Wire Line
- 4350 4100 3550 4100
-Wire Wire Line
- 3550 4100 3550 3850
-Wire Wire Line
- 2600 3950 2600 4100
-Wire Wire Line
- 2600 4100 3550 4100
-Connection ~ 3550 4100
-Wire Wire Line
- 3550 3550 3550 3250
-Connection ~ 3550 3250
-Wire Wire Line
- 3550 3250 3700 3250
-$EndSCHEMATC
+++ /dev/null
-<!doctype html>
-<html lang="en">
-<head>
-<title>Cable organizer</title>
-<!-- 2020-03-21 Sat 00:37 -->
-<meta charset="utf-8">
-<meta name="viewport" content="width=device-width, initial-scale=1">
-<meta name="generator" content="Org-mode">
-<meta name="author" content="Svjatoslav Agejenko">
-<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-<style type="text/css">
-footer {background-color: #111 !important;}
-pre {background-color: #111; color: #ccc;}
-</style>
-<style type="text/css">
-/* org mode styles on top of twbs */
-
-html {
- position: relative;
- min-height: 100%;
-}
-
-body {
- font-size: 18px;
- margin-bottom: 105px;
-}
-
-footer {
- position: absolute;
- bottom: 0;
- width: 100%;
- height: 101px;
- background-color: #f5f5f5;
-}
-
-footer > div {
- padding: 10px;
-}
-
-footer p {
- margin: 0 0 5px;
- text-align: center;
- font-size: 16px;
-}
-
-#table-of-contents {
- margin-top: 20px;
- margin-bottom: 20px;
-}
-
-blockquote p {
- font-size: 18px;
-}
-
-pre {
- font-size: 16px;
-}
-
-.footpara {
- display: inline-block;
-}
-
-figcaption {
- font-size: 16px;
- color: #666;
- font-style: italic;
- padding-bottom: 15px;
-}
-
-/* from twbs docs */
-
-.bs-docs-sidebar.affix {
- position: static;
-}
-@media (min-width: 768px) {
- .bs-docs-sidebar {
- padding-left: 20px;
- }
-}
-
-/* All levels of nav */
-.bs-docs-sidebar .nav > li > a {
- display: block;
- padding: 4px 20px;
- font-size: 14px;
- font-weight: 500;
- color: #999;
-}
-.bs-docs-sidebar .nav > li > a:hover,
-.bs-docs-sidebar .nav > li > a:focus {
- padding-left: 19px;
- color: #A1283B;
- text-decoration: none;
- background-color: transparent;
- border-left: 1px solid #A1283B;
-}
-.bs-docs-sidebar .nav > .active > a,
-.bs-docs-sidebar .nav > .active:hover > a,
-.bs-docs-sidebar .nav > .active:focus > a {
- padding-left: 18px;
- font-weight: bold;
- color: #A1283B;
- background-color: transparent;
- border-left: 2px solid #A1283B;
-}
-
-/* Nav: second level (shown on .active) */
-.bs-docs-sidebar .nav .nav {
- display: none; /* Hide by default, but at >768px, show it */
- padding-bottom: 10px;
-}
-.bs-docs-sidebar .nav .nav > li > a {
- padding-top: 1px;
- padding-bottom: 1px;
- padding-left: 30px;
- font-size: 12px;
- font-weight: normal;
-}
-.bs-docs-sidebar .nav .nav > li > a:hover,
-.bs-docs-sidebar .nav .nav > li > a:focus {
- padding-left: 29px;
-}
-.bs-docs-sidebar .nav .nav > .active > a,
-.bs-docs-sidebar .nav .nav > .active:hover > a,
-.bs-docs-sidebar .nav .nav > .active:focus > a {
- padding-left: 28px;
- font-weight: 500;
-}
-
-/* Nav: third level (shown on .active) */
-.bs-docs-sidebar .nav .nav .nav {
- padding-bottom: 10px;
-}
-.bs-docs-sidebar .nav .nav .nav > li > a {
- padding-top: 1px;
- padding-bottom: 1px;
- padding-left: 40px;
- font-size: 12px;
- font-weight: normal;
-}
-.bs-docs-sidebar .nav .nav .nav > li > a:hover,
-.bs-docs-sidebar .nav .nav .nav > li > a:focus {
- padding-left: 39px;
-}
-.bs-docs-sidebar .nav .nav .nav > .active > a,
-.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
-.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
- padding-left: 38px;
- font-weight: 500;
-}
-
-/* Show and affix the side nav when space allows it */
-@media (min-width: 992px) {
- .bs-docs-sidebar .nav > .active > ul {
- display: block;
- }
- /* Widen the fixed sidebar */
- .bs-docs-sidebar.affix,
- .bs-docs-sidebar.affix-bottom {
- width: 213px;
- }
- .bs-docs-sidebar.affix {
- position: fixed; /* Undo the static from mobile first approach */
- top: 20px;
- }
- .bs-docs-sidebar.affix-bottom {
- position: absolute; /* Undo the static from mobile first approach */
- }
- .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
- margin-top: 0;
- margin-bottom: 0
- }
-}
-@media (min-width: 1200px) {
- /* Widen the fixed sidebar again */
- .bs-docs-sidebar.affix-bottom,
- .bs-docs-sidebar.affix {
- width: 263px;
- }
-}
-</style>
-<script type="text/javascript">
-$(function() {
- 'use strict';
-
- $('.bs-docs-sidebar li').first().addClass('active');
-
- $(document.body).scrollspy({target: '.bs-docs-sidebar'});
-
- $('.bs-docs-sidebar').affix();
-});
-</script>
-</head>
-<body>
-<div id="content" class="container">
-<div class="row"><div class="col-md-9"><h1 class="title">Cable organizer</h1>
-
-<div id="outline-container-sec-1" class="outline-2">
-<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.
-</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.
-</li>
-
-<li>Author:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko
-</li>
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
-</li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a>
-</li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-2" class="outline-2">
-<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-
-<figure>
-<p><img src="make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-
-<p>
-I have lots of wires in my lab, and I need quick access to them. This
-organizer allows to conveniently hang them on the wall. I use double
-sided tape to make it stick.
-</p>
-
-
-<figure>
-<p><img src="body.png" class="img-responsive" alt="body.png">
-</p>
-</figure>
-</div>
-</div>
-
-<div id="outline-container-sec-3" class="outline-2">
-<h2 id="sec-3"><span class="section-number-2">3</span> Files</h2>
-<div class="outline-text-2" id="text-3">
-<p>
-You can <a href="body.FCStd">download FreeCAD project</a> file to tweak design or generated STL
-file ready for 3D printing:
-</p>
-
-<ul class="org-ul">
-<li><a href="body.stl">body.stl</a>
-</li>
-</ul>
-</div>
-</div>
-</div><div class="col-md-3"><nav id="table-of-contents">
-<div id="text-table-of-contents" class="bs-docs-sidebar">
-<ul class="nav">
-<li><a href="#sec-1">1. General</a></li>
-<li><a href="#sec-2">2. Project description</a></li>
-<li><a href="#sec-3">3. Files</a></li>
-</ul>
-</div>
-</nav>
-</div></div></div>
-<footer id="postamble" class="">
-<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2020-03-21 Sat 00:37</p>
-<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
-</div>
-</footer>
-</body>
-</html>
+++ /dev/null
-#+TITLE: Cable organizer
-#+AUTHOR: Svjatoslav Agejenko
-#+LANGUAGE: en
-
-* (document settings) :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD: footer {background-color: #111 !important;}
-#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Author:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-[[file:make.png]]
-
-I have lots of wires in my lab, and I need quick access to them. This
-organizer allows to conveniently hang them on the wall. I use double
-sided tape to make it stick.
-
-[[file:body.png]]
-
-* Files
-You can [[file:body.FCStd][download FreeCAD project]] file to tweak design or generated STL
-file ready for 3D printing:
-
-+ [[file:body.stl]]
+++ /dev/null
-<!doctype html>
-<html lang="en">
-<head>
-<title>Headphone hub</title>
-<!-- 2020-12-25 Fri 23:48 -->
-<meta charset="utf-8">
-<meta name="viewport" content="width=device-width, initial-scale=1">
-<meta name="generator" content="Org-mode">
-<meta name="author" content="Svjatoslav Agejenko">
-<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
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-<body>
-<div id="content" class="container">
-<div class="row"><div class="col-md-9"><h1 class="title">Headphone hub</h1>
-
-<div id="outline-container-sec-1" class="outline-2">
-<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.
-</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.
-</li>
-
-<li>Author:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko
-</li>
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
-</li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a>
-</li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-2" class="outline-2">
-<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-<p>
-Simple hub that allows connecting up to 4 devices via headphone
-jack. For example single laptop or mp3 player can power up to 3
-headphones.
-</p>
-
-
-<figure>
-<p><img src="make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-
-<p>
-Schematic diagram:
-<img src="schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-
-<p>
-Warning: All devices are connected in parallel. Make sure that audio
-producing device can handle combined load. See:
-<a href="https://en.wikipedia.org/wiki/Series_and_parallel_circuits#Resistance_units_2">https://en.wikipedia.org/wiki/Series_and_parallel_circuits#Resistance_units_2</a>
-</p>
-
-
-<figure>
-<p><img src="make,%202.png" class="img-responsive" alt="make,%202.png">
-</p>
-</figure>
-
-<p>
-Device consists of body and cover that are held together by single
-screw at the center:
-</p>
-
-
-<figure>
-<p><img src="cover,%202.png" class="img-responsive" alt="cover,%202.png">
-</p>
-</figure>
-</div>
-</div>
-
-<div id="outline-container-sec-3" class="outline-2">
-<h2 id="sec-3"><span class="section-number-2">3</span> Download</h2>
-<div class="outline-text-2" id="text-3">
-<ul class="org-ul">
-<li><a href="hub.FCStd">FreeCAD project</a>
-</li>
-</ul>
-
-
-<p>
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-<img src="body.png" class="img-responsive" alt="body.png">
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-
-
-<hr >
-<p>
-Cover <a href="cover.stl">STL file</a>
-</p>
-
-
-<figure>
-<p><img src="cover.png" class="img-responsive" alt="cover.png">
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-</figure>
-</div>
-</div>
-</div><div class="col-md-3"><nav id="table-of-contents">
-<div id="text-table-of-contents" class="bs-docs-sidebar">
-<ul class="nav">
-<li><a href="#sec-1">1. General</a></li>
-<li><a href="#sec-2">2. Project description</a></li>
-<li><a href="#sec-3">3. Download</a></li>
-</ul>
-</div>
-</nav>
-</div></div></div>
-<footer id="postamble" class="">
-<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2020-12-25 Fri 23:48</p>
-<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
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-</footer>
-</body>
-</html>
+++ /dev/null
-#+TITLE: Headphone hub
-#+AUTHOR: Svjatoslav Agejenko
-#+LANGUAGE: en
-
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-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Author:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-Simple hub that allows connecting up to 4 devices via headphone
-jack. For example single laptop or mp3 player can power up to 3
-headphones.
-
-[[file:make.png]]
-
-Schematic diagram:
-[[file:schematic.png]]
-
-Warning: All devices are connected in parallel. Make sure that audio
-producing device can handle combined load. See:
-https://en.wikipedia.org/wiki/Series_and_parallel_circuits#Resistance_units_2
-
-[[file:make,%202.png]]
-
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-screw at the center:
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-[[file:cover,%202.png]]
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-* Download
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-- [[file:hub.FCStd][FreeCAD project]]
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-
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-
-
------
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- /*]]>*/-->
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-<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
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-<script type="text/javascript">
-// @license magnet:?xt=urn:btih:e95b018ef3580986a04669f1b5879592219e2a7a&dn=public-domain.txt Public Domain
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-</head>
-<body>
-<div id="content">
-<h1 class="title">General purpose hook</h1>
-<div id="table-of-contents">
-<h2>Table of Contents</h2>
-<div id="text-table-of-contents">
-<ul>
-<li><a href="#orgb85c500">1. General</a></li>
-<li><a href="#org7a16f2f">2. Project description</a></li>
-<li><a href="#org1b91912">3. Files</a></li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-orgb85c500" class="outline-2">
-<h2 id="orgb85c500"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.</li>
-
-<li>Author:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko</li>
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a></li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a></li>
-</ul></li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a></li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a></li>
-</ul></li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-org7a16f2f" class="outline-2">
-<h2 id="org7a16f2f"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-
-<div id="org7b3170b" class="figure">
-<p><img src="make.png" alt="make.png" />
-</p>
-</div>
-
-<p>
-General purpose hook suitable for holding light things. Hook does not
-have screw holes. It is intended to be glued to the surface.
-</p>
-
-
-<div id="org1e03952" class="figure">
-<p><img src="hook.png" alt="hook.png" />
-</p>
-</div>
-</div>
-</div>
-
-<div id="outline-container-org1b91912" class="outline-2">
-<h2 id="org1b91912"><span class="section-number-2">3</span> Files</h2>
-<div class="outline-text-2" id="text-3">
-<p>
-You can <a href="hook.FCStd">download FreeCAD project</a> file to tweak design or generated STL
-file ready for 3D printing:
-</p>
-
-<ul class="org-ul">
-<li><a href="hook.stl">hook.stl</a></li>
-</ul>
-</div>
-</div>
-</div>
-<div id="postamble" class="status">
-<p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2021-07-25 Sun 21:01</p>
-<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
-</div>
-</body>
-</html>
+++ /dev/null
-#+TITLE: General purpose hook
-#+AUTHOR: Svjatoslav Agejenko
-#+LANGUAGE: en
-
-* (document settings) :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD: footer {background-color: #111 !important;}
-#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Author:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-[[file:make.png]]
-
-General purpose hook suitable for holding light things. Hook does not
-have screw holes. It is intended to be glued to the surface.
-
-[[file:hook.png]]
-
-* Files
-You can [[file:hook.FCStd][download FreeCAD project]] file to tweak design or generated STL
-file ready for 3D printing:
-
-+ [[file:hook.stl]]
+++ /dev/null
-<HTML>
-<HEAD>
- <meta HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8"/>
-</HEAD>
-<BODY bgcolor="#000000" alink="#50ffff" link="#50ffff" vlink="#ff50ff" text="#ffffff">
-<!-- DirListGen -->
-<!-- Directory Listing Generator by Svjatoslav Agejenko. E-mail: svjatoslav@svjatoslav.eu, homepage: http://svjatoslav.eu -->
-<font color="#ffffff">
-<CENTER><H1>Gallery</H1></CENTER>
-<CENTER><H2></H2></CENTER>
-<TABLE>
-
-<TR><TD><br></TD></TR>
-</TABLE>
-<div style="float:left; margin: 10px;"><a href="body%2C%201.png">
-<img border="0" src=".thumbnails/body%2C%201%20(4FE5B061).jpeg"/></a><br/>
-<b>body, 1</b><br/>(<a href="body, 1.png">914x739</a>)
-</div><div style="float:left; margin: 10px;"><a href="body%2C%202.png">
-<img border="0" src=".thumbnails/body%2C%202%20(6930C5AD).jpeg"/></a><br/>
-<b>body, 2</b><br/>(<a href="body, 2.png">863x707</a>)
-</div><div style="clear: both;"><a href="body.FCStd">body.FCStd</a>
- (455 KiB)</div><br/>
-<div style="clear: both;"><a href="body.stl">body.stl</a>
- (692 KiB)</div><br/>
-<div style="float:left; margin: 10px;"><a href="bottom%20cover.png">
-<img border="0" src=".thumbnails/bottom%20cover%20(888C2041).jpeg"/></a><br/>
-<b>bottom cover</b><br/>(<a href="bottom cover.png">839x767</a>)
-</div><div style="clear: both;"><a href="bottom%20cover.stl">bottom cover.stl</a>
- (2384 KiB)</div><br/>
-<div style="float:left; margin: 10px;"><a href="make%2C%20bottom.png">
-<img border="0" src=".thumbnails/make%2C%20bottom%20(77EF885B).jpeg"/></a><br/>
-<b>make, bottom</b><br/>(<a href="make, bottom.png">800x695</a>)
-</div><div style="float:left; margin: 10px;"><a href="make.png">
-<img border="0" src=".thumbnails/make%20(BCD5D41).jpeg"/></a><br/>
-<b>make</b><br/>(<a href="make.png">800x1033</a>)
-</div><div style="clear: both;"><a href="schematic-cache.lib">schematic-cache.lib</a>
- (3351 b)</div><br/>
-<div style="float:left; margin: 10px;"><a href="schematic.png">
-<img border="0" src=".thumbnails/schematic%20(5FA81873).jpeg"/></a><br/>
-<b>schematic</b><br/>(<a href="schematic.png">930x552</a>)
-</div><div style="clear: both;"><a href="schematic.sch">schematic.sch</a>
- (4547 b)</div><br/>
-<div style="clear: both;"><a href="schematic.sch-bak">schematic.sch-bak</a>
- (4546 b)</div><br/>
-<div style="float:left; margin: 10px;"><a href="top%20cover.png">
-<img border="0" src=".thumbnails/top%20cover%20(1A1B8AED).jpeg"/></a><br/>
-<b>top cover</b><br/>(<a href="top cover.png">842x755</a>)
-</div><div style="clear: both;"><a href="top%20cover.stl">top cover.stl</a>
- (322 KiB)</div><br/>
-</font></BODY></HTML>
+++ /dev/null
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-S -140 75 -115 0 0 1 0 F
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-$FPLIST
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- TerminalBlock*
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-#
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-F3 "" 0 200 50 H I C CNN
-DRAW
-C -80 -200 20 0 0 0 N
-C -80 200 20 0 0 0 N
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-ENDDRAW
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-#
-#End Library
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-<div id="content" class="container">
-<div class="row"><div class="col-md-9"><h1 class="title">Portable stereo speaker</h1>
-
-<div id="outline-container-sec-1" class="outline-2">
-<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.
-</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.
-</li>
-
-<li>Author:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko
-</li>
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
-</li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a>
-</li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-2" class="outline-2">
-<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-<p>
-I had pair of good compact stereo speakers lying uselessly around as
-well as secondhand TDA2030 Chinese knockoff audio amplifier chips.
-Also I wanted to test modular construction approach: motherboard with
-shared bus and functionality realized via pluggable modules. So I
-built stereo speaker:
-</p>
-
-
-<figure>
-<p><img src="make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-
-<p>
-Indicator on the front panel shows available power within the
-system. Ideally it should be at the maximum. It drops when batteries
-run empty or when consumed power (too loud music) is greater than
-onboard power supply or batteries can handle. It has on/off switch and
-stereo audio input. Audio input impedance is about 100 ohms.
-</p>
-
-
-<figure>
-<p><img src="make,%20side.png" class="img-responsive" alt="make,%20side.png">
-</p>
-</figure>
-
-<p>
-Idea for the holes on the top and smaller ones on the bottom back is
-to enable air flow for passive cooling.
-</p>
-
-
-<figure>
-<p><img src="make,%20back.png" class="img-responsive" alt="make,%20back.png">
-</p>
-</figure>
-
-<p>
-Entire construction is made of parts, no larger than
-120x120x120mm. Maximum for my printer.
-</p>
-</div>
-</div>
-
-<div id="outline-container-sec-3" class="outline-2">
-<h2 id="sec-3"><span class="section-number-2">3</span> Battery holder</h2>
-<div class="outline-text-2" id="text-3">
-<p>
-Device is powered by 4 times AA NiMH batteries (1.2V each).
-</p>
-
-
-<figure>
-<p><img src="battery%20holder/schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-</figure>
-
-<p>
-I happened to have AA battery adapters lying around with different
-bottom hole configurations. Therefore this weird hole design:
-</p>
-
-
-<figure>
-<p><img src="battery%20holder/battery%20holder.png" class="img-responsive" alt="battery%20holder.png">
-</p>
-</figure>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="battery%20holder/battery%20holder.FCStd">FreeCAD file</a>
-</li>
-<li><a href="battery%20holder/battery%20holder.stl">STL file</a>
-</li>
-</ul>
-
-<p>
-Result:
-<img src="battery%20holder/make.png" class="img-responsive" alt="make.png">
-</p>
-
-<p>
-Attaches to the back of the body:
-<img src="battery%20holder/mounted%20on%20the%20back.png" class="img-responsive" alt="mounted%20on%20the%20back.png">
-</p>
-</div>
-</div>
-
-<div id="outline-container-sec-4" class="outline-2">
-<h2 id="sec-4"><span class="section-number-2">4</span> 20V up-step module</h2>
-<div class="outline-text-2" id="text-4">
-<p>
-Battery pack voltage is routed through main on/off switch on the front
-panel, and then it goes to the 20V up-step module.
-</p>
-
-
-<figure>
-<p><img src="20V%20upstep%20module/schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-</figure>
-
-<p>
-It uses ready made upstep module, but adds extra voltage filtering via
-inductor and capacitors.
-</p>
-
-
-<figure>
-<p><img src="20V%20upstep%20module/make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-</div>
-</div>
-
-<div id="outline-container-sec-5" class="outline-2">
-<h2 id="sec-5"><span class="section-number-2">5</span> Main board</h2>
-<div class="outline-text-2" id="text-5">
-<p>
-Voltage upstep above sits on top of main board (motherboard). It has
-uniform central bus that spans all connectors.
-</p>
-
-
-<figure>
-<p><img src="main%20board/internal%20bus.png" class="img-responsive" alt="internal%20bus.png">
-</p>
-</figure>
-
-
-<figure>
-<p><img src="main%20board/bus%20on%20the%20bottom,%202.png" class="img-responsive" alt="bus%20on%20the%20bottom,%202.png">
-</p>
-</figure>
-
-<p>
-First row of the main board is special IO terminal (for connecting
-speakers, front panel, etc..)
-</p>
-
-
-<figure>
-<p><img src="main%20board/IO%20terminal.png" class="img-responsive" alt="IO%20terminal.png">
-</p>
-</figure>
-
-<p>
-Remaining rows are for connecting boards:
-</p>
-
-
-<figure>
-<p><img src="main%20board/1.png" class="img-responsive" alt="1.png">
-</p>
-</figure>
-
-<p>
-To provide structural support, main board is attached to frame:
-</p>
-
-
-<figure>
-<p><img src="main%20board/board%20fixator%20body.png" class="img-responsive" alt="board%20fixator%20body.png">
-</p>
-</figure>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="main%20board/board%20fixator%20body.FCStd">FreeCAD file</a>
-</li>
-<li><a href="main%20board/board%20fixator%20body.stl">STL file</a>
-</li>
-</ul>
-
-<p>
-And boards plugged into main board are fixed at the top, using clip:
-</p>
-
-
-<figure>
-<p><img src="main%20board/board%20fixator%20top%20clip.png" class="img-responsive" alt="board%20fixator%20top%20clip.png">
-</p>
-</figure>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="main%20board/board%20fixator%20top%20clip.FCStd">FreeCAD file</a>
-</li>
-<li><a href="main%20board/board%20fixator%20top%20clip.stl">STL file</a>
-</li>
-</ul>
-
-<p>
-Result:
-</p>
-
-
-<figure>
-<p><img src="main%20board/bus%20on%20the%20bottom,%201.png" class="img-responsive" alt="bus%20on%20the%20bottom,%201.png">
-</p>
-</figure>
-
-
-<figure>
-<p><img src="main%20board/board%20fixator.png" class="img-responsive" alt="board%20fixator.png">
-</p>
-</figure>
-</div>
-</div>
-
-<div id="outline-container-sec-6" class="outline-2">
-<h2 id="sec-6"><span class="section-number-2">6</span> Mono audio amplifier module</h2>
-<div class="outline-text-2" id="text-6">
-<p>
-Design uses scavenged secondhand Chinese TDA2030 audio amp
-clones. Each chip is mono audio amplifier. Therefore 2 almost
-identical audio amp modules had to be built, one for left speaker, one
-for right.
-</p>
-
-
-<figure>
-<p><img src="mono%20audio%20amp%20module/schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-</figure>
-
-<p>
-I like to build on top of prototype PCBs. Gives results much faster
-for one-off projects. Before soldering, I solve component layout on
-paper:
-</p>
-
-
-<figure>
-<p><img src="mono%20audio%20amp%20module/PCB%20layout.png" class="img-responsive" alt="PCB%20layout.png">
-</p>
-</figure>
-
-<p>
-Result - front:
-</p>
-
-
-<figure>
-<p><img src="mono%20audio%20amp%20module/assembled%20front.png" class="img-responsive" alt="assembled%20front.png">
-</p>
-</figure>
-
-<p>
-Result - back:
-</p>
-
-
-<figure>
-<p><img src="mono%20audio%20amp%20module/assembled%20back.png" class="img-responsive" alt="assembled%20back.png">
-</p>
-</figure>
-
-<p>
-Here copper tape is used as improvised heatsink.
-</p>
-</div>
-</div>
-
-<div id="outline-container-sec-7" class="outline-2">
-<h2 id="sec-7"><span class="section-number-2">7</span> Speakers</h2>
-<div class="outline-text-2" id="text-7">
-<p>
-High frequency small speaker and medium frequency bigger speaker are
-combined.
-</p>
-
-
-<figure>
-<p><img src="speakers/schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-</figure>
-
-<p>
-Capacitor acts as high-pass filter on top of tiny PCB:
-</p>
-
-
-<figure>
-<p><img src="speakers/PCB%20layout.png" class="img-responsive" alt="PCB%20layout.png">
-</p>
-</figure>
-
-<p>
-Speaker enclosure:
-</p>
-
-
-<figure>
-<p><img src="speakers/speaker%20enclosure.png" class="img-responsive" alt="speaker%20enclosure.png">
-</p>
-</figure>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="speakers/speaker%20enclosure.FCStd">FreeCAD file</a>
-</li>
-<li><a href="speakers/speaker%20enclosure.stl">STL file</a>
-</li>
-</ul>
-
-<p>
-Speaker enclosure cover:
-</p>
-
-
-<figure>
-<p><img src="speakers/speaker%20enclosure%20cover.png" class="img-responsive" alt="speaker%20enclosure%20cover.png">
-</p>
-</figure>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="speakers/speaker%20enclosure%20cover.FCStd">FreeCAD file</a>
-</li>
-<li><a href="speakers/speaker%20enclosure%20cover.stl">STL file</a>
-</li>
-</ul>
-
-<p>
-Result:
-</p>
-
-
-<figure>
-<p><img src="speakers/make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-</div>
-</div>
-
-<div id="outline-container-sec-8" class="outline-2">
-<h2 id="sec-8"><span class="section-number-2">8</span> Front panel</h2>
-<div class="outline-text-2" id="text-8">
-<p>
-Initial idea was really simple panel:
-</p>
-<ul class="org-ul">
-<li>on/off switch
-</li>
-<li>system power indicator
-</li>
-<li>stereo audio input
-</li>
-</ul>
-
-<p>
-But, since I'm using "agile" approach, during load-testing, it become
-clear that active fan based cooling would be nice (when playing loud
-music). I found tiny cooler fan that needs 5 volts to operate. Also I
-need to power backlight for power indicator. For both of these cases,
-I decided to add another voltage up-step module (target voltage output
-set to 6V). This time directly on the front panel.
-</p>
-
-
-<figure>
-<p><img src="front%20panel/schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-</figure>
-
-<p>
-Front panel case:
-</p>
-
-
-<figure>
-<p><img src="front%20panel/front%20panel,%20front.png" class="img-responsive" alt="front%20panel,%20front.png">
-</p>
-</figure>
-
-
-<figure>
-<p><img src="front%20panel/front%20panel,%20back.png" class="img-responsive" alt="front%20panel,%20back.png">
-</p>
-</figure>
-
-<p>
-Electronics fits inside:
-</p>
-
-
-<figure>
-<p><img src="front%20panel/front%20panel,%20back,%20make.png" class="img-responsive" alt="front%20panel,%20back,%20make.png">
-</p>
-</figure>
-
-<p>
-Front view:
-</p>
-
-
-<figure>
-<p><img src="front%20panel/front%20panel,%20front,%20make.png" class="img-responsive" alt="front%20panel,%20front,%20make.png">
-</p>
-</figure>
-
-<p>
-And attaches to the remaining components:
-</p>
-
-
-<figure>
-<p><img src="front%20panel/attachment.png" class="img-responsive" alt="attachment.png">
-</p>
-</figure>
-</div>
-</div>
-
-
-<div id="outline-container-sec-9" class="outline-2">
-<h2 id="sec-9"><span class="section-number-2">9</span> Extra capacitors</h2>
-<div class="outline-text-2" id="text-9">
-<p>
-Another thing that become clear during load-testing: output
-power/volume can be further enhanced by adding high power capacitors
-to even out load on primary 20V up-step module.
-</p>
-
-
-<figure>
-<p><img src="extra%20capacitors/extra%20caps.png" class="img-responsive" alt="extra%20caps.png">
-</p>
-</figure>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="extra%20capacitors/extra%20caps.FCStd">FreeCAD project</a>
-</li>
-<li><a href="extra%20capacitors/extra%20caps.stl">STL file</a>
-</li>
-</ul>
-
-<p>
-Extra caps are mounted on top of the speaker and electrically attached
-to the main board.
-</p>
-
-
-<figure>
-<p><img src="extra%20capacitors/make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-</div>
-</div>
-
-<div id="outline-container-sec-10" class="outline-2">
-<h2 id="sec-10"><span class="section-number-2">10</span> Center box</h2>
-<div class="outline-text-2" id="text-10">
-<p>
-Last physical part, to attach it all together: central body.
-</p>
-
-<p>
-Front:
-<img src="center%20box/front.png" class="img-responsive" alt="front.png">
-</p>
-
-<p>
-Back:
-<img src="center%20box/back.png" class="img-responsive" alt="back.png">
-</p>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="center%20box/center%20box.FCStd">FreeCAD file</a>
-</li>
-<li><a href="center%20box/center%20box.stl">STL file</a>
-</li>
-</ul>
-</div>
-</div>
-
-
-<div id="outline-container-sec-11" class="outline-2">
-<h2 id="sec-11"><span class="section-number-2">11</span> Conclusions / TODO</h2>
-<div class="outline-text-2" id="text-11">
-<p>
-These things could be done better:
-</p>
-
-<ul class="org-ul">
-<li>Instead of using undersized heatsinks on the audio amplifiers and
-need for active cooling as a consequence, it would be better to try
-to mount audio amplifier chip on top of speaker metallic body. It
-would provide plenty of cooling and reduces power losses within
-cable, since amplifier would be as close to the speaker as possible.
-</li>
-
-<li>I used agile design. That is, implemented functionality ad-hoc. If I
-had done design in advance, then I could have had smarter connector
-layout between main board and front panel. That is: Instead of
-multiple smaller cables, one wide (multi connector) cable.
-</li>
-
-<li>Screw holes are too close to the edges on the front panel.
-</li>
-
-<li>It would be better if screw heads were slightly buried within
-construction body.
-</li>
-</ul>
-
-
-<p>
-Overall, it was good learning experience and I was able to test
-various ideas on it. Will add cooler later :)
-</p>
-
-
-<p>
-Photo of initial PSU + audio amp test:
-</p>
-
-
-<figure>
-<p><img src="initial%20test.png" class="img-responsive" alt="initial%20test.png">
-</p>
-</figure>
-</div>
-</div>
-</div><div class="col-md-3"><nav id="table-of-contents">
-<div id="text-table-of-contents" class="bs-docs-sidebar">
-<ul class="nav">
-<li><a href="#sec-1">1. General</a></li>
-<li><a href="#sec-2">2. Project description</a></li>
-<li><a href="#sec-3">3. Battery holder</a></li>
-<li><a href="#sec-4">4. 20V up-step module</a></li>
-<li><a href="#sec-5">5. Main board</a></li>
-<li><a href="#sec-6">6. Mono audio amplifier module</a></li>
-<li><a href="#sec-7">7. Speakers</a></li>
-<li><a href="#sec-8">8. Front panel</a></li>
-<li><a href="#sec-9">9. Extra capacitors</a></li>
-<li><a href="#sec-10">10. Center box</a></li>
-<li><a href="#sec-11">11. Conclusions / TODO</a></li>
-</ul>
-</div>
-</nav>
-</div></div></div>
-<footer id="postamble" class="">
-<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2020-04-12 P 23:58</p>
-<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
-</div>
-</footer>
-</body>
-</html>
+++ /dev/null
-#+TITLE: Portable stereo speaker
-#+AUTHOR: Svjatoslav Agejenko
-#+LANGUAGE: en
-
-* (document settings) :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD: footer {background-color: #111 !important;}
-#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Author:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-I had pair of good compact stereo speakers lying uselessly around as
-well as secondhand TDA2030 Chinese knockoff audio amplifier chips.
-Also I wanted to test modular construction approach: motherboard with
-shared bus and functionality realized via pluggable modules. So I
-built stereo speaker:
-
-[[file:make.png]]
-
-Indicator on the front panel shows available power within the
-system. Ideally it should be at the maximum. It drops when batteries
-run empty or when consumed power (too loud music) is greater than
-onboard power supply or batteries can handle. It has on/off switch and
-stereo audio input. Audio input impedance is about 100 ohms.
-
-[[file:make,%20side.png]]
-
-Idea for the holes on the top and smaller ones on the bottom back is
-to enable air flow for passive cooling.
-
-[[file:make,%20back.png]]
-
-Entire construction is made of parts, no larger than
-120x120x120mm. Maximum for my printer.
-
-* Battery holder
-Device is powered by 4 times AA NiMH batteries (1.2V each).
-
-[[file:battery%20holder/schematic.png]]
-
-I happened to have AA battery adapters lying around with different
-bottom hole configurations. Therefore this weird hole design:
-
-[[file:battery%20holder/battery%20holder.png]]
-
-Download:
-+ [[file:battery%20holder/battery%20holder.FCStd][FreeCAD file]]
-+ [[file:battery%20holder/battery%20holder.stl][STL file]]
-
-Result:
-[[file:battery%20holder/make.png]]
-
-Attaches to the back of the body:
-[[file:battery%20holder/mounted%20on%20the%20back.png]]
-
-* 20V up-step module
-Battery pack voltage is routed through main on/off switch on the front
-panel, and then it goes to the 20V up-step module.
-
-[[file:20V%20upstep%20module/schematic.png]]
-
-It uses ready made upstep module, but adds extra voltage filtering via
-inductor and capacitors.
-
-[[file:20V%20upstep%20module/make.png]]
-
-* Main board
-
-Voltage upstep above sits on top of main board (motherboard). It has
-uniform central bus that spans all connectors.
-
-[[file:main%20board/internal%20bus.png]]
-
-[[file:main%20board/bus%20on%20the%20bottom,%202.png]]
-
-First row of the main board is special IO terminal (for connecting
-speakers, front panel, etc..)
-
-[[file:main%20board/IO%20terminal.png]]
-
-Remaining rows are for connecting boards:
-
-[[file:main%20board/1.png]]
-
-To provide structural support, main board is attached to frame:
-
-[[file:main%20board/board%20fixator%20body.png]]
-
-Download:
-+ [[file:main%20board/board%20fixator%20body.FCStd][FreeCAD file]]
-+ [[file:main%20board/board%20fixator%20body.stl][STL file]]
-
-And boards plugged into main board are fixed at the top, using clip:
-
-[[file:main%20board/board%20fixator%20top%20clip.png]]
-
-Download:
-+ [[file:main%20board/board%20fixator%20top%20clip.FCStd][FreeCAD file]]
-+ [[file:main%20board/board%20fixator%20top%20clip.stl][STL file]]
-
-Result:
-
-[[file:main%20board/bus%20on%20the%20bottom,%201.png]]
-
-[[file:main%20board/board%20fixator.png]]
-
-* Mono audio amplifier module
-
-Design uses scavenged secondhand Chinese TDA2030 audio amp
-clones. Each chip is mono audio amplifier. Therefore 2 almost
-identical audio amp modules had to be built, one for left speaker, one
-for right.
-
-[[file:mono%20audio%20amp%20module/schematic.png]]
-
-I like to build on top of prototype PCBs. Gives results much faster
-for one-off projects. Before soldering, I solve component layout on
-paper:
-
-[[file:mono%20audio%20amp%20module/PCB%20layout.png]]
-
-Result - front:
-
-[[file:mono%20audio%20amp%20module/assembled%20front.png]]
-
-Result - back:
-
-[[file:mono%20audio%20amp%20module/assembled%20back.png]]
-
-Here copper tape is used as improvised heatsink.
-
-* Speakers
-
-High frequency small speaker and medium frequency bigger speaker are
-combined.
-
-[[file:speakers/schematic.png]]
-
-Capacitor acts as high-pass filter on top of tiny PCB:
-
-[[file:speakers/PCB%20layout.png]]
-
-Speaker enclosure:
-
-[[file:speakers/speaker%20enclosure.png]]
-
-Download:
-+ [[file:speakers/speaker%20enclosure.FCStd][FreeCAD file]]
-+ [[file:speakers/speaker%20enclosure.stl][STL file]]
-
-Speaker enclosure cover:
-
-[[file:speakers/speaker%20enclosure%20cover.png]]
-
-Download:
-+ [[file:speakers/speaker%20enclosure%20cover.FCStd][FreeCAD file]]
-+ [[file:speakers/speaker%20enclosure%20cover.stl][STL file]]
-
-Result:
-
-[[file:speakers/make.png]]
-
-* Front panel
-
-Initial idea was really simple panel:
-+ on/off switch
-+ system power indicator
-+ stereo audio input
-
-But, since I'm using "agile" approach, during load-testing, it become
-clear that active fan based cooling would be nice (when playing loud
-music). I found tiny cooler fan that needs 5 volts to operate. Also I
-need to power backlight for power indicator. For both of these cases,
-I decided to add another voltage up-step module (target voltage output
-set to 6V). This time directly on the front panel.
-
-[[file:front%20panel/schematic.png]]
-
-Front panel case:
-
-[[file:front%20panel/front%20panel,%20front.png]]
-
-[[file:front%20panel/front%20panel,%20back.png]]
-
-Electronics fits inside:
-
-[[file:front%20panel/front%20panel,%20back,%20make.png]]
-
-Front view:
-
-[[file:front%20panel/front%20panel,%20front,%20make.png]]
-
-And attaches to the remaining components:
-
-[[file:front%20panel/attachment.png]]
-
-* Extra capacitors
-Another thing that become clear during load-testing: output
-power/volume can be further enhanced by adding high power capacitors
-to even out load on primary 20V up-step module.
-
-[[file:extra%20capacitors/extra%20caps.png]]
-
-Download:
-+ [[file:extra%20capacitors/extra%20caps.FCStd][FreeCAD project]]
-+ [[file:extra%20capacitors/extra%20caps.stl][STL file]]
-
-Extra caps are mounted on top of the speaker and electrically attached
-to the main board.
-
-[[file:extra%20capacitors/make.png]]
-
-* Center box
-
-Last physical part, to attach it all together: central body.
-
-Front:
-[[file:center%20box/front.png]]
-
-Back:
-[[file:center%20box/back.png]]
-
-Download:
-+ [[file:center%20box/center%20box.FCStd][FreeCAD file]]
-+ [[file:center%20box/center%20box.stl][STL file]]
-
-* Conclusions / TODO
-Photo of initial PSU + audio amp test:
-[[file:initial%20test.png]]
-
-
-Improvement ideas:
-
-+ Instead of using undersized heatsinks on the audio amplifiers and
- need for active cooling as a consequence, it would be better to try
- to mount audio amplifier chip on top of speaker metallic body. It
- would provide plenty of cooling and reduces power losses within
- cable, since amplifier would be as close to the speaker as possible.
-
-+ Add possibility to power device from USB socket in addition to
- batteries.
-
-+ Front panel:
- + Use digital voltage indicator to gauge remaining battery power.
-
- + Add possibility to have multiple inputs.
-
- + It would be better if screw heads were slightly buried within
- construction body.
-
- + Screw holes are too close to the edges on the front panel.
+++ /dev/null
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+++ /dev/null
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-<h1 class="title">Round ended pincers</h1>
-<div id="table-of-contents">
-<h2>Table of Contents</h2>
-<div id="text-table-of-contents">
-<ul>
-<li><a href="#orgcad4de5">1. General</a></li>
-<li><a href="#org180a195">2. Project description</a></li>
-<li><a href="#org0a87982">3. Download</a></li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-orgcad4de5" class="outline-2">
-<h2 id="orgcad4de5"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.</li>
-
-<li>Author:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko</li>
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a></li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a></li>
-</ul></li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a></li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a></li>
-</ul></li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-org180a195" class="outline-2">
-<h2 id="org180a195"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-<p>
-Pincers allow to push LEGO EV3 rounded pins in and also pull them out.
-</p>
-
-
-<div id="org88effb3" class="figure">
-<p><img src="make.png" alt="make.png" />
-</p>
-</div>
-
-<p>
-Make sure to have strong infill pattern and thick borders when
-printing for maximum strength.
-</p>
-
-<p>
-Schematic:
-<img src="schematic.png" alt="schematic.png" />
-</p>
-
-<p>
-Design has half of the pincers. 2 identical pieces have to be printed
-out and connected at the end with glue and screw.
-</p>
-
-
-<div id="org1d4b3fb" class="figure">
-<p><img src="make, 2.png" alt="make, 2.png" />
-</p>
-</div>
-</div>
-</div>
-
-<div id="outline-container-org0a87982" class="outline-2">
-<h2 id="org0a87982"><span class="section-number-2">3</span> Download</h2>
-<div class="outline-text-2" id="text-3">
-<ul class="org-ul">
-<li><a href="round pincers.FCStd">FreeCAD project</a></li>
-<li><a href="round pincers.stl">STL file</a></li>
-</ul>
-</div>
-</div>
-</div>
-<div id="postamble" class="status">
-<p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2021-04-11 Sun 21:17</p>
-<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
-</div>
-</body>
-</html>
+++ /dev/null
-#+TITLE: Round ended pincers
-#+AUTHOR: Svjatoslav Agejenko
-#+LANGUAGE: en
-
-* (document settings) :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD: footer {background-color: #111 !important;}
-#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Author:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-Pincers allow to push LEGO EV3 rounded pins in and also pull them out.
-
-[[file:make.png]]
-
-Make sure to have strong infill pattern and thick borders when
-printing for maximum strength.
-
-Schematic:
-[[file:schematic.png]]
-
-Design has half of the pincers. 2 identical pieces have to be printed
-out and connected at the end with glue and screw.
-
-[[file:make, 2.png]]
-
-* Download
-
-- [[file:round pincers.FCStd][FreeCAD project]]
-- [[file:round pincers.stl][STL file]]
+++ /dev/null
-<!doctype html>
-<html lang="en">
-<head>
-<title>Window holder</title>
-<!-- 2020-06-22 Mon 20:54 -->
-<meta charset="utf-8">
-<meta name="viewport" content="width=device-width, initial-scale=1">
-<meta name="generator" content="Org-mode">
-<meta name="author" content="Svjatoslav Agejenko">
-<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-<style type="text/css">
-footer {background-color: #111 !important;}
-pre {background-color: #111; color: #ccc;}
-</style>
-<style type="text/css">
-/* org mode styles on top of twbs */
-
-html {
- position: relative;
- min-height: 100%;
-}
-
-body {
- font-size: 18px;
- margin-bottom: 105px;
-}
-
-footer {
- position: absolute;
- bottom: 0;
- width: 100%;
- height: 101px;
- background-color: #f5f5f5;
-}
-
-footer > div {
- padding: 10px;
-}
-
-footer p {
- margin: 0 0 5px;
- text-align: center;
- font-size: 16px;
-}
-
-#table-of-contents {
- margin-top: 20px;
- margin-bottom: 20px;
-}
-
-blockquote p {
- font-size: 18px;
-}
-
-pre {
- font-size: 16px;
-}
-
-.footpara {
- display: inline-block;
-}
-
-figcaption {
- font-size: 16px;
- color: #666;
- font-style: italic;
- padding-bottom: 15px;
-}
-
-/* from twbs docs */
-
-.bs-docs-sidebar.affix {
- position: static;
-}
-@media (min-width: 768px) {
- .bs-docs-sidebar {
- padding-left: 20px;
- }
-}
-
-/* All levels of nav */
-.bs-docs-sidebar .nav > li > a {
- display: block;
- padding: 4px 20px;
- font-size: 14px;
- font-weight: 500;
- color: #999;
-}
-.bs-docs-sidebar .nav > li > a:hover,
-.bs-docs-sidebar .nav > li > a:focus {
- padding-left: 19px;
- color: #A1283B;
- text-decoration: none;
- background-color: transparent;
- border-left: 1px solid #A1283B;
-}
-.bs-docs-sidebar .nav > .active > a,
-.bs-docs-sidebar .nav > .active:hover > a,
-.bs-docs-sidebar .nav > .active:focus > a {
- padding-left: 18px;
- font-weight: bold;
- color: #A1283B;
- background-color: transparent;
- border-left: 2px solid #A1283B;
-}
-
-/* Nav: second level (shown on .active) */
-.bs-docs-sidebar .nav .nav {
- display: none; /* Hide by default, but at >768px, show it */
- padding-bottom: 10px;
-}
-.bs-docs-sidebar .nav .nav > li > a {
- padding-top: 1px;
- padding-bottom: 1px;
- padding-left: 30px;
- font-size: 12px;
- font-weight: normal;
-}
-.bs-docs-sidebar .nav .nav > li > a:hover,
-.bs-docs-sidebar .nav .nav > li > a:focus {
- padding-left: 29px;
-}
-.bs-docs-sidebar .nav .nav > .active > a,
-.bs-docs-sidebar .nav .nav > .active:hover > a,
-.bs-docs-sidebar .nav .nav > .active:focus > a {
- padding-left: 28px;
- font-weight: 500;
-}
-
-/* Nav: third level (shown on .active) */
-.bs-docs-sidebar .nav .nav .nav {
- padding-bottom: 10px;
-}
-.bs-docs-sidebar .nav .nav .nav > li > a {
- padding-top: 1px;
- padding-bottom: 1px;
- padding-left: 40px;
- font-size: 12px;
- font-weight: normal;
-}
-.bs-docs-sidebar .nav .nav .nav > li > a:hover,
-.bs-docs-sidebar .nav .nav .nav > li > a:focus {
- padding-left: 39px;
-}
-.bs-docs-sidebar .nav .nav .nav > .active > a,
-.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
-.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
- padding-left: 38px;
- font-weight: 500;
-}
-
-/* Show and affix the side nav when space allows it */
-@media (min-width: 992px) {
- .bs-docs-sidebar .nav > .active > ul {
- display: block;
- }
- /* Widen the fixed sidebar */
- .bs-docs-sidebar.affix,
- .bs-docs-sidebar.affix-bottom {
- width: 213px;
- }
- .bs-docs-sidebar.affix {
- position: fixed; /* Undo the static from mobile first approach */
- top: 20px;
- }
- .bs-docs-sidebar.affix-bottom {
- position: absolute; /* Undo the static from mobile first approach */
- }
- .bs-docs-sidebar.affix .bs-docs-sidenav,.bs-docs-sidebar.affix-bottom .bs-docs-sidenav {
- margin-top: 0;
- margin-bottom: 0
- }
-}
-@media (min-width: 1200px) {
- /* Widen the fixed sidebar again */
- .bs-docs-sidebar.affix-bottom,
- .bs-docs-sidebar.affix {
- width: 263px;
- }
-}
-</style>
-<script type="text/javascript">
-$(function() {
- 'use strict';
-
- $('.bs-docs-sidebar li').first().addClass('active');
-
- $(document.body).scrollspy({target: '.bs-docs-sidebar'});
-
- $('.bs-docs-sidebar').affix();
-});
-</script>
-</head>
-<body>
-<div id="content" class="container">
-<div class="row"><div class="col-md-9"><h1 class="title">Window holder</h1>
-
-<div id="outline-container-sec-1" class="outline-2">
-<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
-<div class="outline-text-2" id="text-1">
-<ul class="org-ul">
-<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-DESIGNS AT YOUR OWN RISK.
-</li>
-
-<li>This design is released under Creative Commons Zero (CC0) license.
-</li>
-
-<li>Authors:
-<ul class="org-ul">
-<li>Svjatoslav Agejenko
-<ul class="org-ul">
-<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
-</li>
-<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-
-<li>Valeria Agejenko
-</li>
-</ul>
-</li>
-
-<li>See also:
-<ul class="org-ul">
-<li><a href="../../index.html">Other physical projects in this repository</a>
-</li>
-<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
-</li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-
-<div id="outline-container-sec-2" class="outline-2">
-<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
-<div class="outline-text-2" id="text-2">
-
-<figure>
-<p><img src="make.png" class="img-responsive" alt="make.png">
-</p>
-</figure>
-
-<p>
-Keeps window open so that strong wind will not slam it close.
-</p>
-
-
-<figure>
-<p><img src="schematic.png" class="img-responsive" alt="schematic.png">
-</p>
-</figure>
-
-<p>
-Download:
-</p>
-<ul class="org-ul">
-<li><a href="window%20fixator.stl">STL file</a>
-</li>
-<li><a href="window%20fixator.FCStd">FreeCAD file</a>
-</li>
-</ul>
-</div>
-</div>
-</div><div class="col-md-3"><nav id="table-of-contents">
-<div id="text-table-of-contents" class="bs-docs-sidebar">
-<ul class="nav">
-<li><a href="#sec-1">1. General</a></li>
-<li><a href="#sec-2">2. Project description</a></li>
-</ul>
-</div>
-</nav>
-</div></div></div>
-<footer id="postamble" class="">
-<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2020-06-22 Mon 20:54</p>
-<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
-</div>
-</footer>
-</body>
-</html>
+++ /dev/null
-#+TITLE: Window holder
-#+AUTHOR: Svjatoslav Agejenko
-#+LANGUAGE: en
-
-* (document settings) :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD: footer {background-color: #111 !important;}
-#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
- COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
- DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Authors:
- - Svjatoslav Agejenko
- - Homepage: https://svjatoslav.eu
- - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
- - Valeria Agejenko
-
-+ See also:
- - [[../../index.html][Other physical projects in this repository]]
- - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-[[file:make.png]]
-
-Keeps window open so that strong wind will not slam it close.
-
-[[file:schematic.png]]
-
-Download:
-+ [[file:window%20fixator.stl][STL file]]
-+ [[file:window%20fixator.FCStd][FreeCAD file]]
--- /dev/null
+#!/bin/bash
+
+#
+# This is a helper bash script that starts IntelliJ with the current project.
+# Script is written is such a way that you can simply click on it in file
+# navigator to run it.
+#
+#
+# Script assumes:
+#
+# + GNU operating system
+# + IntelliJ is installed and commandline launcher "idea" is enabled.
+#
+
+cd "${0%/*}"
+cd ..
+
+setsid idea . &>/dev/null
projects / physical.git / commitdiff
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