<html lang="en">
<head>
<title>Physical projects</title>
-<!-- 2020-08-09 Sun 15:06 -->
+<!-- 2020-08-22 L 15:40 -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="generator" content="Org-mode">
</div>
-
<div id="outline-container-sec-2-3" class="outline-3">
<h3 id="sec-2-3"><span class="section-number-3">2.3</span> Power</h3>
<div class="outline-text-3" id="text-2-3">
power/battery%20tester/make.png
"></a>
</li>
+
+<li>adjustable resistor / indicator
+<br/><a href="power/adjustable%20resistor/index.html"><img style="width:100%; max-width:500px;" src="
+ power/adjustable%20resistor/make.png
+ "></a>
+</li>
</ul>
</div>
</div>
+
<div id="outline-container-sec-2-4" class="outline-3">
<h3 id="sec-2-4"><span class="section-number-3">2.4</span> USB</h3>
<div class="outline-text-3" id="text-2-4">
</div></div></div>
<footer id="postamble" class="">
<div><p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2020-08-09 Sun 15:06</p>
+<p class="date">Created: 2020-08-22 L 15:40</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>
)}}}
-
** Power
+ 12V Lead-Acid battery charger and terminal
{{{imglnk(
power/battery%20tester/make.png
)}}}
++ adjustable resistor / indicator
+ {{{imglnk(
+ power/adjustable%20resistor/index.html,
+ power/adjustable%20resistor/make.png
+ )}}}
+
+
** USB
+ USB cable terminals
--- /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
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+encoding utf-8
+Sheet 1 1
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
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+$EndDescr
+$Comp
+L Connector:USB_A J1
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+$EndComp
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+$EndComp
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+$EndComp
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+F 3 "~" H 5750 3550 50 0001 C CNN
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--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 1
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
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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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+
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+
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+
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+ display: inline-block;
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+
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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]]
projects / physical.git / commitdiff
