From: Svjatoslav Agejenko Date: Sat, 16 May 2020 18:14:02 +0000 (+0300) Subject: created audio category X-Git-Url: http://www2.svjatoslav.eu/gitweb/?a=commitdiff_plain;h=2cf21a70188d1b59bf571e128c11a44ee351f434;p=physical.git created audio category --- diff --git a/audio/Portable stereo active speaker/20V upstep module/make.png b/audio/Portable stereo active speaker/20V upstep module/make.png new file mode 100644 index 0000000..b63097d Binary files /dev/null and b/audio/Portable stereo active speaker/20V upstep module/make.png differ diff --git a/audio/Portable stereo active speaker/20V upstep module/schematic.png b/audio/Portable stereo active speaker/20V upstep module/schematic.png new file mode 100644 index 0000000..ce46ada Binary files /dev/null and b/audio/Portable stereo active speaker/20V upstep module/schematic.png differ diff --git a/audio/Portable stereo active speaker/battery holder/battery holder.FCStd b/audio/Portable stereo active speaker/battery holder/battery 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+

Portable stereo speaker

+ +
+

1 General

+
+ +
+
+ +
+

2 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: +

+ + +
+

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. +

+ + +
+

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. +

+ + +
+

make,%20back.png +

+
+ +

+Entire construction is made of parts, no larger than +120x120x120mm. Maximum for my printer. +

+
+
+ +
+

3 Battery holder

+
+

+Device is powered by 4 times AA NiMH batteries (1.2V each). +

+ + +
+

schematic.png +

+
+ +

+I happened to have AA battery adapters lying around with different +bottom hole configurations. Therefore this weird hole design: +

+ + +
+

battery%20holder.png +

+
+ +

+Download: +

+ + +

+Result: +make.png +

+ +

+Attaches to the back of the body: +mounted%20on%20the%20back.png +

+
+
+ +
+

4 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. +

+ + +
+

schematic.png +

+
+ +

+It uses ready made upstep module, but adds extra voltage filtering via +inductor and capacitors. +

+ + +
+

make.png +

+
+
+
+ +
+

5 Main board

+
+

+Voltage upstep above sits on top of main board (motherboard). It has +uniform central bus that spans all connectors. +

+ + +
+

internal%20bus.png +

+
+ + +
+

bus%20on%20the%20bottom,%202.png +

+
+ +

+First row of the main board is special IO terminal (for connecting +speakers, front panel, etc..) +

+ + +
+

IO%20terminal.png +

+
+ +

+Remaining rows are for connecting boards: +

+ + +
+

1.png +

+
+ +

+To provide structural support, main board is attached to frame: +

+ + +
+

board%20fixator%20body.png +

+
+ +

+Download: +

+ + +

+And boards plugged into main board are fixed at the top, using clip: +

+ + +
+

board%20fixator%20top%20clip.png +

+
+ +

+Download: +

+ + +

+Result: +

+ + +
+

bus%20on%20the%20bottom,%201.png +

+
+ + +
+

board%20fixator.png +

+
+
+
+ +
+

6 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. +

+ + +
+

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: +

+ + +
+

PCB%20layout.png +

+
+ +

+Result - front: +

+ + +
+

assembled%20front.png +

+
+ +

+Result - back: +

+ + +
+

assembled%20back.png +

+
+ +

+Here copper tape is used as improvised heatsink. +

+
+
+ +
+

7 Speakers

+
+

+High frequency small speaker and medium frequency bigger speaker are +combined. +

+ + +
+

schematic.png +

+
+ +

+Capacitor acts as high-pass filter on top of tiny PCB: +

+ + +
+

PCB%20layout.png +

+
+ +

+Speaker enclosure: +

+ + +
+

speaker%20enclosure.png +

+
+ +

+Download: +

+ + +

+Speaker enclosure cover: +

+ + +
+

speaker%20enclosure%20cover.png +

+
+ +

+Download: +

+ + +

+Result: +

+ + +
+

make.png +

+
+
+
+ +
+

8 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. +

+ + +
+

schematic.png +

+
+ +

+Front panel case: +

+ + +
+

front%20panel,%20front.png +

+
+ + +
+

front%20panel,%20back.png +

+
+ +

+Electronics fits inside: +

+ + +
+

front%20panel,%20back,%20make.png +

+
+ +

+Front view: +

+ + +
+

front%20panel,%20front,%20make.png +

+
+ +

+And attaches to the remaining components: +

+ + +
+

attachment.png +

+
+
+
+ + +
+

9 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. +

+ + +
+

extra%20caps.png +

+
+ +

+Download: +

+ + +

+Extra caps are mounted on top of the speaker and electrically attached +to the main board. +

+ + +
+

make.png +

+
+
+
+ +
+

10 Center box

+
+

+Last physical part, to attach it all together: central body. +

+ +

+Front: +front.png +

+ +

+Back: +back.png +

+ +

+Download: +

+ +
+
+ + +
+

11 Conclusions / TODO

+
+

+These things could be done better: +

+ +
    +
  • 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. +
    • + +
  • 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. +
    • + +
  • Screw holes are too close to the edges on the front panel. +
    • + +
  • It would be better if screw heads were slightly buried within +construction body. +
    • +
+ + +

+Overall, it was good learning experience and I was able to test +various ideas on it. Will add cooler later :) +

+ + +

+Photo of initial PSU + audio amp test: +

+ + +
+

initial%20test.png +

+
+
+
+
+
+ + + diff --git a/audio/Portable stereo active speaker/index.org b/audio/Portable stereo active speaker/index.org new file mode 100644 index 0000000..e85fa1f --- /dev/null +++ b/audio/Portable stereo active speaker/index.org @@ -0,0 +1,276 @@ +#+TITLE: Portable stereo speaker +#+AUTHOR: Svjatoslav Agejenko +#+LANGUAGE: en + +* (document settings) :noexport: +** use dark style for TWBS-HTML exporter +#+HTML_HEAD: +#+HTML_HEAD: +#+HTML_HEAD: +#+HTML_HEAD: + +* 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 + +These things could be done better: + ++ 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. + ++ 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. + ++ Screw holes are too close to the edges on the front panel. + ++ It would be better if screw heads were slightly buried within + construction body. + + +Overall, it was good learning experience and I was able to test +various ideas on it. Will add cooler later :) + + +Photo of initial PSU + audio amp test: + +[[file:initial%20test.png]] diff --git a/audio/Portable stereo active speaker/initial test.png b/audio/Portable stereo active speaker/initial test.png new file mode 100644 index 0000000..f07db1f Binary files /dev/null and b/audio/Portable stereo active speaker/initial test.png differ diff --git a/audio/Portable stereo active speaker/main board/1.png b/audio/Portable stereo active speaker/main board/1.png new file mode 100644 index 0000000..ca7c160 Binary files /dev/null and b/audio/Portable stereo active speaker/main board/1.png differ diff --git a/audio/Portable stereo active speaker/main board/IO terminal.png b/audio/Portable stereo active speaker/main board/IO terminal.png new file mode 100644 index 0000000..1b36d9e Binary files /dev/null and b/audio/Portable stereo active speaker/main board/IO terminal.png differ diff --git a/audio/Portable stereo active speaker/main board/board fixator body.FCStd 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speaker/main board/internal bus.png differ diff --git a/audio/Portable stereo active speaker/make, back.png b/audio/Portable stereo active speaker/make, back.png new file mode 100644 index 0000000..8490579 Binary files /dev/null and b/audio/Portable stereo active speaker/make, back.png differ diff --git a/audio/Portable stereo active speaker/make, side.png b/audio/Portable stereo active speaker/make, side.png new file mode 100644 index 0000000..f6ab1be Binary files /dev/null and b/audio/Portable stereo active speaker/make, side.png differ diff --git a/audio/Portable stereo active speaker/make.png b/audio/Portable stereo active speaker/make.png new file mode 100644 index 0000000..4988e4e Binary files /dev/null and b/audio/Portable stereo active speaker/make.png differ diff --git a/audio/Portable stereo active speaker/mono audio amp module/PCB layout.png b/audio/Portable stereo active speaker/mono audio amp module/PCB layout.png new file mode 100644 index 0000000..9fdfebe Binary files /dev/null and b/audio/Portable stereo active speaker/mono audio amp module/PCB layout.png differ diff --git a/audio/Portable stereo active speaker/mono audio amp module/assembled back.png b/audio/Portable stereo active speaker/mono audio amp module/assembled back.png new file mode 100644 index 0000000..7ca3a8c Binary files /dev/null and b/audio/Portable stereo active speaker/mono audio amp module/assembled back.png differ diff --git a/audio/Portable stereo active speaker/mono audio amp module/assembled front.png b/audio/Portable stereo active speaker/mono audio amp module/assembled front.png new file mode 100644 index 0000000..824d219 Binary files /dev/null and b/audio/Portable stereo active speaker/mono audio amp module/assembled front.png differ diff --git a/audio/Portable stereo active speaker/mono audio amp module/schematic-cache.lib b/audio/Portable stereo active speaker/mono audio amp module/schematic-cache.lib new file mode 100644 index 0000000..94e7bd4 --- /dev/null +++ b/audio/Portable stereo active speaker/mono audio amp module/schematic-cache.lib @@ -0,0 +1,112 @@ +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 diff --git a/audio/Portable stereo active speaker/mono audio amp module/schematic.png b/audio/Portable stereo active speaker/mono audio amp module/schematic.png new file mode 100644 index 0000000..22cd5cb Binary files /dev/null and b/audio/Portable stereo active speaker/mono audio amp module/schematic.png differ diff --git a/audio/Portable stereo active speaker/mono audio amp module/schematic.pro b/audio/Portable stereo active speaker/mono audio amp module/schematic.pro new file mode 100644 index 0000000..152769c --- /dev/null +++ b/audio/Portable stereo active speaker/mono audio amp module/schematic.pro @@ -0,0 +1,33 @@ +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] diff --git a/audio/Portable stereo active speaker/mono audio amp module/schematic.sch b/audio/Portable stereo active speaker/mono audio amp module/schematic.sch new file mode 100644 index 0000000..8ddde88 --- /dev/null +++ b/audio/Portable stereo active speaker/mono audio amp module/schematic.sch @@ -0,0 +1,449 @@ +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 +$Comp +L Device:C C4 +U 1 1 5E9315A7 +P 3400 3300 +F 0 "C4" V 3652 3300 50 0000 C CNN +F 1 "2.2u" V 3561 3300 50 0000 C CNN +F 2 "" H 3438 3150 50 0001 C CNN +F 3 "~" H 3400 3300 50 0001 C CNN + 1 3400 3300 + 0 -1 -1 0 +$EndComp +Wire Wire Line + 3550 3300 3650 3300 +$Comp +L Device:R R2 +U 1 1 5E931B66 +P 3100 2600 +F 0 "R2" H 3170 2646 50 0000 L CNN +F 1 "100k" H 3170 2555 50 0000 L CNN +F 2 "" V 3030 2600 50 0001 C CNN +F 3 "~" H 3100 2600 50 0001 C CNN + 1 3100 2600 + 1 0 0 -1 +$EndComp +$Comp +L Device:R R3 +U 1 1 5E931D42 +P 3100 3900 +F 0 "R3" H 3170 3946 50 0000 L CNN +F 1 "100k" H 3170 3855 50 0000 L CNN +F 2 "" V 3030 3900 50 0001 C CNN +F 3 "~" H 3100 3900 50 0001 C CNN + 1 3100 3900 + 1 0 0 -1 +$EndComp +Connection ~ 3650 3300 +Wire Wire Line + 3650 3300 3950 3300 +$Comp +L Device:R R4 +U 1 1 5E93212A +P 3450 3650 +F 0 "R4" V 3657 3650 50 0000 C CNN +F 1 "100k" V 3566 3650 50 0000 C CNN +F 2 "" V 3380 3650 50 0001 C CNN +F 3 "~" H 3450 3650 50 0001 C CNN + 1 3450 3650 + 0 -1 -1 0 +$EndComp +Wire Wire Line + 3600 3650 3650 3650 +Wire Wire Line + 3650 3300 3650 3650 +Wire Wire Line + 3300 3650 3100 3650 +Wire Wire Line + 3100 3650 3100 3750 +Wire Wire Line + 3100 2750 3100 3650 +Connection ~ 3100 3650 +Wire Wire Line + 2450 3300 3250 3300 +Connection ~ 2450 3300 +Wire Wire Line + 2450 3750 2450 3300 +$Comp +L Device:R R1 +U 1 1 5E938DF3 +P 2450 3900 +F 0 "R1" H 2520 3946 50 0000 L CNN +F 1 "100" H 2520 3855 50 0000 L CNN +F 2 "" V 2380 3900 50 0001 C CNN +F 3 "~" H 2450 3900 50 0001 C CNN + 1 2450 3900 + 1 0 0 -1 +$EndComp +Wire Wire Line + 2100 3300 2450 3300 +$Comp +L Connector:Conn_01x01_Male J2 +U 1 1 5E930B02 +P 1900 3300 +F 0 "J2" H 2008 3481 50 0000 C CNN +F 1 "6 / 8: audio in" H 2008 3390 50 0000 C CNN +F 2 "" H 1900 3300 50 0001 C CNN +F 3 "~" H 1900 3300 50 0001 C CNN + 1 1900 3300 + 1 0 0 -1 +$EndComp +$Comp +L Device:C C3 +U 1 1 5E93BB29 +P 2750 3900 +F 0 "C3" H 2865 3946 50 0000 L CNN +F 1 "22u" H 2865 3855 50 0000 L CNN +F 2 "" H 2788 3750 50 0001 C CNN +F 3 "~" H 2750 3900 50 0001 C CNN + 1 2750 3900 + 1 0 0 -1 +$EndComp +Wire Wire Line + 2750 3750 2750 3650 +Wire Wire Line + 2750 3650 3100 3650 +Wire Wire Line + 2450 4050 2450 4200 +Wire Wire Line + 2450 4200 2750 4200 +Wire Wire Line + 3100 4200 3100 4050 +Wire Wire Line + 2750 4050 2750 4200 +Connection ~ 2750 4200 +Wire Wire Line + 2750 4200 3100 4200 +$Comp +L power:GND #PWR03 +U 1 1 5E93C58E +P 2750 4350 +F 0 "#PWR03" H 2750 4100 50 0001 C CNN +F 1 "GND" H 2755 4177 50 0000 C CNN +F 2 "" H 2750 4350 50 0001 C CNN +F 3 "" H 2750 4350 50 0001 C CNN + 1 2750 4350 + 1 0 0 -1 +$EndComp +Wire Wire Line + 2750 4350 2750 4200 +$Comp +L Device:C C2 +U 1 1 5E93DE05 +P 3750 2600 +F 0 "C2" H 3865 2646 50 0000 L CNN +F 1 "0.1u" H 3865 2555 50 0000 L CNN +F 2 "" H 3788 2450 50 0001 C CNN +F 3 "~" H 3750 2600 50 0001 C CNN + 1 3750 2600 + 1 0 0 -1 +$EndComp +Wire Wire Line + 3100 2350 3100 2450 +Wire Wire Line + 4150 2350 4150 3100 +$Comp +L Connector:Conn_01x01_Male J1 +U 1 1 5E941037 +P 1900 2350 +F 0 "J1" H 2008 2531 50 0000 C CNN +F 1 "4, 5: +20V in" H 2008 2440 50 0000 C CNN +F 2 "" H 1900 2350 50 0001 C CNN +F 3 "~" H 1900 2350 50 0001 C CNN + 1 1900 2350 + 1 0 0 -1 +$EndComp +Wire Wire Line + 2100 2350 2300 2350 +Connection ~ 3100 2350 +Wire Wire Line + 3100 2350 3750 2350 +$Comp +L Device:C C1 +U 1 1 5E947A16 +P 2300 2600 +F 0 "C1" H 2415 2646 50 0000 L CNN +F 1 "220u" H 2415 2555 50 0000 L CNN +F 2 "" H 2338 2450 50 0001 C CNN +F 3 "~" H 2300 2600 50 0001 C CNN + 1 2300 2600 + 1 0 0 -1 +$EndComp +Wire Wire Line + 2300 2450 2300 2350 +Connection ~ 2300 2350 +$Comp +L power:GND #PWR01 +U 1 1 5E94DCC8 +P 2300 2850 +F 0 "#PWR01" H 2300 2600 50 0001 C CNN +F 1 "GND" H 2305 2677 50 0000 C CNN +F 2 "" H 2300 2850 50 0001 C CNN +F 3 "" H 2300 2850 50 0001 C CNN + 1 2300 2850 + 1 0 0 -1 +$EndComp +$Comp +L power:GND #PWR02 +U 1 1 5E94E046 +P 3750 2850 +F 0 "#PWR02" H 3750 2600 50 0001 C CNN +F 1 "GND" H 3755 2677 50 0000 C CNN +F 2 "" H 3750 2850 50 0001 C CNN +F 3 "" H 3750 2850 50 0001 C CNN + 1 3750 2850 + 1 0 0 -1 +$EndComp +Wire Wire Line + 2300 2850 2300 2750 +Wire Wire Line + 3750 2850 3750 2750 +$Comp +L power:GND #PWR05 +U 1 1 5E954AB9 +P 4150 3750 +F 0 "#PWR05" H 4150 3500 50 0001 C CNN +F 1 "GND" H 4155 3577 50 0000 C CNN +F 2 "" H 4150 3750 50 0001 C CNN +F 3 "" H 4150 3750 50 0001 C CNN + 1 4150 3750 + 1 0 0 -1 +$EndComp +Wire Wire Line + 4150 3750 4150 3700 +$Comp +L Device:C C5 +U 1 1 5E955467 +P 3800 4450 +F 0 "C5" H 3915 4496 50 0000 L CNN +F 1 "2.2u" H 3915 4405 50 0000 L CNN +F 2 "" H 3838 4300 50 0001 C CNN +F 3 "~" H 3800 4450 50 0001 C CNN + 1 3800 4450 + 1 0 0 -1 +$EndComp +Wire Wire Line + 3800 4300 3800 4200 +Wire Wire Line + 3800 3500 3950 3500 +$Comp +L Device:R R5 +U 1 1 5E95609E +P 3800 4850 +F 0 "R5" H 3870 4896 50 0000 L CNN +F 1 "4k7" H 3870 4805 50 0000 L CNN +F 2 "" V 3730 4850 50 0001 C CNN +F 3 "~" H 3800 4850 50 0001 C CNN + 1 3800 4850 + 1 0 0 -1 +$EndComp +Wire Wire Line + 3800 4700 3800 4600 +$Comp +L power:GND #PWR04 +U 1 1 5E95735E +P 3800 5100 +F 0 "#PWR04" H 3800 4850 50 0001 C CNN +F 1 "GND" H 3805 4927 50 0000 C CNN +F 2 "" H 3800 5100 50 0001 C CNN +F 3 "" H 3800 5100 50 0001 C CNN + 1 3800 5100 + 1 0 0 -1 +$EndComp +Wire Wire Line + 3800 5100 3800 5000 +$Comp +L Device:R R6 +U 1 1 5E95CDA0 +P 4350 4200 +F 0 "R6" V 4143 4200 50 0000 C CNN +F 1 "100k" V 4234 4200 50 0000 C CNN +F 2 "" V 4280 4200 50 0001 C CNN +F 3 "~" H 4350 4200 50 0001 C CNN + 1 4350 4200 + 0 1 1 0 +$EndComp +Wire Wire Line + 4200 4200 3800 4200 +Connection ~ 3800 4200 +Wire Wire Line + 3800 4200 3800 3500 +Wire Wire Line + 4500 4200 4600 4200 +Wire Wire Line + 4600 4200 4600 3400 +Wire Wire Line + 4600 3400 4550 3400 +$Comp +L Device:D D2 +U 1 1 5E95E389 +P 4600 4500 +F 0 "D2" V 4554 4579 50 0000 L CNN +F 1 "D" V 4645 4579 50 0000 L CNN +F 2 "" H 4600 4500 50 0001 C CNN +F 3 "~" H 4600 4500 50 0001 C CNN + 1 4600 4500 + 0 1 1 0 +$EndComp +$Comp +L Amplifier_Audio:TDA2030 U1 +U 1 1 5E9303C6 +P 4250 3400 +F 0 "U1" H 4594 3446 50 0000 L CNN +F 1 "TDA2030" H 4594 3355 50 0000 L CNN +F 2 "Package_TO_SOT_THT:TO-220-5_P3.4x3.7mm_StaggerOdd_Lead3.8mm_Vertical" H 4250 3400 50 0001 C CIN +F 3 "http://www.st.com/resource/en/datasheet/cd00000128.pdf" H 4250 3400 50 0001 C CNN + 1 4250 3400 + 1 0 0 -1 +$EndComp +Wire Wire Line + 4600 4350 4600 4200 +Connection ~ 4600 4200 +$Comp +L power:GND #PWR06 +U 1 1 5E96169D +P 4600 4800 +F 0 "#PWR06" H 4600 4550 50 0001 C CNN +F 1 "GND" H 4605 4627 50 0000 C CNN +F 2 "" H 4600 4800 50 0001 C CNN +F 3 "" H 4600 4800 50 0001 C CNN + 1 4600 4800 + 1 0 0 -1 +$EndComp +Wire Wire Line + 4600 4800 4600 4650 +$Comp +L Device:D D1 +U 1 1 5E9623DA +P 4600 2600 +F 0 "D1" V 4554 2679 50 0000 L CNN +F 1 "D" V 4645 2679 50 0000 L CNN +F 2 "" H 4600 2600 50 0001 C CNN +F 3 "~" H 4600 2600 50 0001 C CNN + 1 4600 2600 + 0 1 1 0 +$EndComp +Wire Wire Line + 4600 2750 4600 3400 +Connection ~ 4600 3400 +Wire Wire Line + 4600 2450 4600 2350 +Wire Wire Line + 4600 2350 4150 2350 +Connection ~ 4150 2350 +$Comp +L Device:R R7 +U 1 1 5E967089 +P 5000 3750 +F 0 "R7" H 5070 3796 50 0000 L CNN +F 1 "1" H 5070 3705 50 0000 L CNN +F 2 "" V 4930 3750 50 0001 C CNN +F 3 "~" H 5000 3750 50 0001 C CNN + 1 5000 3750 + 1 0 0 -1 +$EndComp +$Comp +L Device:C C6 +U 1 1 5E967648 +P 5000 4150 +F 0 "C6" H 5115 4196 50 0000 L CNN +F 1 "0.1u" H 5115 4105 50 0000 L CNN +F 2 "" H 5038 4000 50 0001 C CNN +F 3 "~" H 5000 4150 50 0001 C CNN + 1 5000 4150 + 1 0 0 -1 +$EndComp +$Comp +L power:GND #PWR07 +U 1 1 5E967B1B +P 5000 4400 +F 0 "#PWR07" H 5000 4150 50 0001 C CNN +F 1 "GND" H 5005 4227 50 0000 C CNN +F 2 "" H 5000 4400 50 0001 C CNN +F 3 "" H 5000 4400 50 0001 C CNN + 1 5000 4400 + 1 0 0 -1 +$EndComp +$Comp +L Device:C C7 +U 1 1 5E967F8E +P 5350 3400 +F 0 "C7" V 5098 3400 50 0000 C CNN +F 1 "2200u" V 5189 3400 50 0000 C CNN +F 2 "" H 5388 3250 50 0001 C CNN +F 3 "~" H 5350 3400 50 0001 C CNN + 1 5350 3400 + 0 1 1 0 +$EndComp +Wire Wire Line + 4600 3400 5000 3400 +Wire Wire Line + 5000 3600 5000 3400 +Connection ~ 5000 3400 +Wire Wire Line + 5000 3400 5200 3400 +Wire Wire Line + 5000 3900 5000 4000 +Wire Wire Line + 5000 4300 5000 4400 +$Comp +L Connector:Conn_01x01_Male J3 +U 1 1 5E96C10D +P 5800 3400 +F 0 "J3" H 5772 3332 50 0000 R CNN +F 1 "7 / 9: speaker signal out" H 5772 3423 50 0000 R CNN +F 2 "" H 5800 3400 50 0001 C CNN +F 3 "~" H 5800 3400 50 0001 C CNN + 1 5800 3400 + -1 0 0 1 +$EndComp +Wire Wire Line + 5500 3400 5600 3400 +Wire Wire Line + 2300 2350 3100 2350 +Wire Wire Line + 3750 2450 3750 2350 +Connection ~ 3750 2350 +Wire Wire Line + 3750 2350 4150 2350 +$Comp +L Connector:Conn_01x01_Male J4 +U 1 1 5E989AED +P 2000 4750 +F 0 "J4" H 2108 4931 50 0000 C CNN +F 1 "1, 2: GND" H 2108 4840 50 0000 C CNN +F 2 "" H 2000 4750 50 0001 C CNN +F 3 "~" H 2000 4750 50 0001 C CNN + 1 2000 4750 + 1 0 0 -1 +$EndComp +$Comp +L power:GND #PWR08 +U 1 1 5E98A1F3 +P 2350 4900 +F 0 "#PWR08" H 2350 4650 50 0001 C CNN +F 1 "GND" H 2355 4727 50 0000 C CNN +F 2 "" H 2350 4900 50 0001 C CNN +F 3 "" H 2350 4900 50 0001 C CNN + 1 2350 4900 + 1 0 0 -1 +$EndComp +Wire Wire Line + 2350 4900 2350 4750 +Wire Wire Line + 2350 4750 2200 4750 +$EndSCHEMATC diff --git a/audio/Portable stereo active speaker/speakers/PCB layout.png b/audio/Portable stereo active speaker/speakers/PCB layout.png new file mode 100644 index 0000000..cc5a33d Binary files /dev/null and b/audio/Portable stereo active speaker/speakers/PCB layout.png differ diff --git a/audio/Portable stereo active speaker/speakers/make.png b/audio/Portable stereo active speaker/speakers/make.png new file mode 100644 index 0000000..b987697 Binary files /dev/null and b/audio/Portable stereo active speaker/speakers/make.png differ diff --git a/audio/Portable stereo active speaker/speakers/schematic.png b/audio/Portable stereo active speaker/speakers/schematic.png new file mode 100644 index 0000000..e1c04b9 Binary files /dev/null and b/audio/Portable stereo active speaker/speakers/schematic.png differ diff --git a/audio/Portable stereo active speaker/speakers/speaker enclosure cover.FCStd b/audio/Portable stereo active speaker/speakers/speaker enclosure cover.FCStd new file mode 100644 index 0000000..bb1e1e7 Binary files /dev/null and b/audio/Portable stereo active speaker/speakers/speaker enclosure cover.FCStd differ diff --git a/audio/Portable stereo active speaker/speakers/speaker enclosure cover.png b/audio/Portable stereo active speaker/speakers/speaker enclosure cover.png new file mode 100644 index 0000000..784820a Binary files /dev/null and b/audio/Portable stereo active speaker/speakers/speaker enclosure cover.png differ diff --git a/audio/Portable stereo active speaker/speakers/speaker enclosure cover.stl b/audio/Portable stereo active speaker/speakers/speaker enclosure cover.stl new file mode 100644 index 0000000..f756d27 Binary files /dev/null and b/audio/Portable stereo active speaker/speakers/speaker enclosure cover.stl differ diff --git a/audio/Portable stereo active speaker/speakers/speaker enclosure.FCStd b/audio/Portable stereo active speaker/speakers/speaker enclosure.FCStd new file mode 100644 index 0000000..dd5c930 Binary files /dev/null and b/audio/Portable stereo active speaker/speakers/speaker enclosure.FCStd differ diff --git a/audio/Portable stereo active speaker/speakers/speaker enclosure.png b/audio/Portable stereo active speaker/speakers/speaker enclosure.png new file mode 100644 index 0000000..6854623 Binary files /dev/null and b/audio/Portable stereo active speaker/speakers/speaker enclosure.png differ diff --git a/audio/Portable stereo active speaker/speakers/speaker enclosure.stl b/audio/Portable stereo active speaker/speakers/speaker enclosure.stl new file mode 100644 index 0000000..3fff7be Binary files /dev/null and b/audio/Portable stereo active speaker/speakers/speaker enclosure.stl differ diff --git a/index.html b/index.html index c6c59ad..d7f9b3c 100644 --- a/index.html +++ b/index.html @@ -2,7 +2,7 @@ Physical projects - + @@ -255,16 +255,23 @@ git clone https://www2.svjatoslav.eu/git/physical.git

2 Projects

-

2.1 Miscellaneous

+

2.1 Audio

+
+
+
+

2.2 Miscellaneous

+
+
-
-

2.2 Optics

-
+
+

2.3 Optics

+
-
-

2.3 Organizers / boxes / covers

-
+
+

2.4 Organizers / boxes / covers

+
  • Cable organizer
      @@ -380,9 +387,9 @@ git clone https://www2.svjatoslav.eu/git/physical.git
-
-

2.4 Radio

-
+
+

2.5 Radio

+

Author: Svjatoslav Agejenko

-

Created: 2020-05-07 N 22:21

+

Created: 2020-05-16 L 21:12

Emacs 26.1 (Org-mode 9.1.9)

diff --git a/index.org b/index.org index b9f1a2f..f399a70 100644 --- a/index.org +++ b/index.org @@ -36,14 +36,15 @@ Collection of physical projects. Electronics, 3D designs etc.. : git clone https://www2.svjatoslav.eu/git/physical.git * Projects +** Audio ++ [[file:audio/Portable%20stereo%20active%20speaker/index.html][Portable stereo speaker]] + + [[file:audio/Portable%20stereo%20active%20speaker/make.png]] + ** Miscellaneous :PROPERTIES: :ID: 0482740b-0f2e-4138-804d-37c7025124d3 :END: -+ [[file:misc/Portable%20stereo%20active%20speaker/index.html][Portable stereo speaker]] - + [[file:misc/Portable%20stereo%20active%20speaker/make.png]] - + [[file:misc/CAT%20B30%20phone%20cover/index.html][Cover for CAT B30 phone]] + [[file:misc/CAT%20B30%20phone%20cover/make.png]] diff --git a/misc/Portable stereo active speaker/20V upstep module/make.png b/misc/Portable stereo active speaker/20V upstep module/make.png deleted file mode 100644 index b63097d..0000000 Binary files a/misc/Portable stereo active speaker/20V upstep module/make.png and /dev/null differ diff --git a/misc/Portable stereo active speaker/20V upstep module/schematic.png 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stereo active speaker/index.html +++ /dev/null @@ -1,805 +0,0 @@ - - - -Portable stereo speaker - - - - - - - - - - - - - -
-

Portable stereo speaker

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1 General

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2 Project description

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-

-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: -

- - -
-

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. -

- - -
-

make,%20side.png -

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- -

-Idea for the holes on the top and smaller ones on the bottom back is -to enable air flow for passive cooling. -

- - -
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make,%20back.png -

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-Entire construction is made of parts, no larger than -120x120x120mm. Maximum for my printer. -

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3 Battery holder

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-Device is powered by 4 times AA NiMH batteries (1.2V each). -

- - -
-

schematic.png -

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- -

-I happened to have AA battery adapters lying around with different -bottom hole configurations. Therefore this weird hole design: -

- - -
-

battery%20holder.png -

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- -

-Download: -

- - -

-Result: -make.png -

- -

-Attaches to the back of the body: -mounted%20on%20the%20back.png -

-
-
- -
-

4 20V up-step module

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-Battery pack voltage is routed through main on/off switch on the front -panel, and then it goes to the 20V up-step module. -

- - -
-

schematic.png -

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- -

-It uses ready made upstep module, but adds extra voltage filtering via -inductor and capacitors. -

- - -
-

make.png -

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5 Main board

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-

-Voltage upstep above sits on top of main board (motherboard). It has -uniform central bus that spans all connectors. -

- - -
-

internal%20bus.png -

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- - -
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bus%20on%20the%20bottom,%202.png -

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- -

-First row of the main board is special IO terminal (for connecting -speakers, front panel, etc..) -

- - -
-

IO%20terminal.png -

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- -

-Remaining rows are for connecting boards: -

- - -
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1.png -

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- -

-To provide structural support, main board is attached to frame: -

- - -
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board%20fixator%20body.png -

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- -

-Download: -

- - -

-And boards plugged into main board are fixed at the top, using clip: -

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-

board%20fixator%20top%20clip.png -

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- -

-Download: -

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-Result: -

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bus%20on%20the%20bottom,%201.png -

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board%20fixator.png -

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6 Mono audio amplifier module

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-

-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. -

- - -
-

schematic.png -

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- -

-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: -

- - -
-

PCB%20layout.png -

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- -

-Result - front: -

- - -
-

assembled%20front.png -

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- -

-Result - back: -

- - -
-

assembled%20back.png -

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- -

-Here copper tape is used as improvised heatsink. -

-
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-

7 Speakers

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-

-High frequency small speaker and medium frequency bigger speaker are -combined. -

- - -
-

schematic.png -

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- -

-Capacitor acts as high-pass filter on top of tiny PCB: -

- - -
-

PCB%20layout.png -

-
- -

-Speaker enclosure: -

- - -
-

speaker%20enclosure.png -

-
- -

-Download: -

- - -

-Speaker enclosure cover: -

- - -
-

speaker%20enclosure%20cover.png -

-
- -

-Download: -

- - -

-Result: -

- - -
-

make.png -

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- -
-

8 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. -

- - -
-

schematic.png -

-
- -

-Front panel case: -

- - -
-

front%20panel,%20front.png -

-
- - -
-

front%20panel,%20back.png -

-
- -

-Electronics fits inside: -

- - -
-

front%20panel,%20back,%20make.png -

-
- -

-Front view: -

- - -
-

front%20panel,%20front,%20make.png -

-
- -

-And attaches to the remaining components: -

- - -
-

attachment.png -

-
-
-
- - -
-

9 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. -

- - -
-

extra%20caps.png -

-
- -

-Download: -

- - -

-Extra caps are mounted on top of the speaker and electrically attached -to the main board. -

- - -
-

make.png -

-
-
-
- -
-

10 Center box

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-

-Last physical part, to attach it all together: central body. -

- -

-Front: -front.png -

- -

-Back: -back.png -

- -

-Download: -

- -
-
- - -
-

11 Conclusions / TODO

-
-

-These things could be done better: -

- -
    -
  • 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. -
    • - -
  • 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. -
    • - -
  • Screw holes are too close to the edges on the front panel. -
    • - -
  • It would be better if screw heads were slightly buried within -construction body. -
    • -
- - -

-Overall, it was good learning experience and I was able to test -various ideas on it. Will add cooler later :) -

- - -

-Photo of initial PSU + audio amp test: -

- - -
-

initial%20test.png -

-
-
-
-
-
-
-

Author: Svjatoslav Agejenko

-

Created: 2020-04-12 P 23:58

-

Emacs 26.1 (Org-mode 9.1.9)

-
-
- - diff --git a/misc/Portable stereo active speaker/index.org b/misc/Portable stereo active speaker/index.org deleted file mode 100644 index e85fa1f..0000000 --- a/misc/Portable stereo active speaker/index.org +++ /dev/null @@ -1,276 +0,0 @@ -#+TITLE: Portable stereo speaker -#+AUTHOR: Svjatoslav Agejenko -#+LANGUAGE: en - -* (document settings) :noexport: -** use dark style for TWBS-HTML exporter -#+HTML_HEAD: -#+HTML_HEAD: -#+HTML_HEAD: -#+HTML_HEAD: - -* 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 - -These things could be done better: - -+ 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. - -+ 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. - -+ Screw holes are too close to the edges on the front panel. - -+ It would be better if screw heads were slightly buried within - construction body. - - -Overall, it was good learning experience and I was able to test -various ideas on it. Will add cooler later :) - - -Photo of initial PSU + audio amp test: - -[[file:initial%20test.png]] diff --git a/misc/Portable stereo active speaker/initial test.png b/misc/Portable stereo active speaker/initial test.png deleted file mode 100644 index f07db1f..0000000 Binary files a/misc/Portable stereo active speaker/initial test.png and /dev/null differ diff --git a/misc/Portable stereo active speaker/main board/1.png b/misc/Portable stereo active speaker/main board/1.png deleted file mode 100644 index ca7c160..0000000 Binary files a/misc/Portable stereo active speaker/main board/1.png and /dev/null differ diff --git a/misc/Portable stereo active speaker/main board/IO terminal.png b/misc/Portable stereo active speaker/main board/IO terminal.png deleted file mode 100644 index 1b36d9e..0000000 Binary files a/misc/Portable stereo active speaker/main board/IO terminal.png and /dev/null differ diff --git a/misc/Portable stereo active speaker/main board/board fixator body.FCStd 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files a/misc/Portable stereo active speaker/mono audio amp module/PCB layout.png and /dev/null differ diff --git a/misc/Portable stereo active speaker/mono audio amp module/assembled back.png b/misc/Portable stereo active speaker/mono audio amp module/assembled back.png deleted file mode 100644 index 7ca3a8c..0000000 Binary files a/misc/Portable stereo active speaker/mono audio amp module/assembled back.png and /dev/null differ diff --git a/misc/Portable stereo active speaker/mono audio amp module/assembled front.png b/misc/Portable stereo active speaker/mono audio amp module/assembled front.png deleted file mode 100644 index 824d219..0000000 Binary files a/misc/Portable stereo active speaker/mono audio amp module/assembled front.png and /dev/null differ diff --git a/misc/Portable stereo active speaker/mono audio amp module/schematic-cache.lib b/misc/Portable stereo active speaker/mono audio amp module/schematic-cache.lib deleted file mode 100644 index 94e7bd4..0000000 --- a/misc/Portable stereo active speaker/mono audio amp module/schematic-cache.lib +++ /dev/null @@ -1,112 +0,0 @@ -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 diff --git a/misc/Portable stereo active speaker/mono audio amp module/schematic.png b/misc/Portable stereo active speaker/mono audio amp module/schematic.png deleted file mode 100644 index 22cd5cb..0000000 Binary files a/misc/Portable stereo active speaker/mono audio amp module/schematic.png and /dev/null differ diff --git a/misc/Portable stereo active speaker/mono audio amp module/schematic.pro b/misc/Portable stereo active speaker/mono audio amp module/schematic.pro deleted file mode 100644 index 152769c..0000000 --- a/misc/Portable stereo active speaker/mono audio amp module/schematic.pro +++ /dev/null @@ -1,33 +0,0 @@ -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] diff --git a/misc/Portable stereo active speaker/mono audio amp module/schematic.sch b/misc/Portable stereo active speaker/mono audio amp module/schematic.sch deleted file mode 100644 index 8ddde88..0000000 --- a/misc/Portable stereo active speaker/mono audio amp module/schematic.sch +++ /dev/null @@ -1,449 +0,0 @@ -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 -$Comp -L Device:C C4 -U 1 1 5E9315A7 -P 3400 3300 -F 0 "C4" V 3652 3300 50 0000 C CNN -F 1 "2.2u" V 3561 3300 50 0000 C CNN -F 2 "" H 3438 3150 50 0001 C CNN -F 3 "~" H 3400 3300 50 0001 C CNN - 1 3400 3300 - 0 -1 -1 0 -$EndComp -Wire Wire Line - 3550 3300 3650 3300 -$Comp -L Device:R R2 -U 1 1 5E931B66 -P 3100 2600 -F 0 "R2" H 3170 2646 50 0000 L CNN -F 1 "100k" H 3170 2555 50 0000 L CNN -F 2 "" V 3030 2600 50 0001 C CNN -F 3 "~" H 3100 2600 50 0001 C CNN - 1 3100 2600 - 1 0 0 -1 -$EndComp -$Comp -L Device:R R3 -U 1 1 5E931D42 -P 3100 3900 -F 0 "R3" H 3170 3946 50 0000 L CNN -F 1 "100k" H 3170 3855 50 0000 L CNN -F 2 "" V 3030 3900 50 0001 C CNN -F 3 "~" H 3100 3900 50 0001 C CNN - 1 3100 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