tag:blogger.com,1999:blog-3256982158719272482024-03-19T05:52:09.432-07:00SigmaThis Blog is about electronic music, synthesizers and SDIY. Sigma-music can be found on Bandcamp (http://sigma2.bandcamp.com/), CDBaby and several other web streaming/downloading services.Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.comBlogger155125tag:blogger.com,1999:blog-325698215871927248.post-44935747876721138342020-10-25T01:57:00.000-07:002020-10-25T01:57:33.603-07:00Lexicon PCM80 AD-converter<p> Finally I have found a replacement chip for CS5389 AD-converter in my PCM80 reverb. Lexicon worked from digital-input but analog inputs were silent. I once ordered CS5389-chip with eBay from China but that never arrived to Finland. Now I tried creative_dynamo from eBay and this was a success. I ordered direct replacement chip CS5390 from creative_dynamo UK. After I had checked the voltages and replaced the old 89-chip with 90 one everything worked as supposed. </p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgL4R7vskWDZHCP9fIPxJjHFd6Jx_L8lQUUO2CyAe8MkPFI2UVy-9YrZLcyzpDHbB9PKlEyv8mtTWza2W-9KzfSPWfTTswMwmdee8AtcNoZ686aciazmvLIY9B1XLgyeAIkmf1FD3LBmKQ/s2048/DSC_0504.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1360" data-original-width="2048" height="265" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgL4R7vskWDZHCP9fIPxJjHFd6Jx_L8lQUUO2CyAe8MkPFI2UVy-9YrZLcyzpDHbB9PKlEyv8mtTWza2W-9KzfSPWfTTswMwmdee8AtcNoZ686aciazmvLIY9B1XLgyeAIkmf1FD3LBmKQ/w400-h265/DSC_0504.jpg" width="400" /></a></div><br /><p>Now my PCM80 is back in business. Thanks creative_dynamo!</p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZzCpm0S9YaK34lxBifPQLqyuilFXxeP650nMOiJdrBp-an_zWTABZbVHL5bmLFEihDgzuRwE-hm61jZzih6qqZTGyNwXxwO0HCdIO8a2NcY9-V_iif4ek7IixoNqdeMdCDHwHvPoDaX0/s1927/DSC_0507.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="166" data-original-width="1927" height="35" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZzCpm0S9YaK34lxBifPQLqyuilFXxeP650nMOiJdrBp-an_zWTABZbVHL5bmLFEihDgzuRwE-hm61jZzih6qqZTGyNwXxwO0HCdIO8a2NcY9-V_iif4ek7IixoNqdeMdCDHwHvPoDaX0/w400-h35/DSC_0507.jpg" width="400" /></a></div><br /><p><br /></p>Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-49137974667767573882020-06-25T23:45:00.000-07:002020-06-25T23:45:21.028-07:00AS3046 DIPAlfa's <a href="https://www.ericasynths.lv/media/AS3046.pdf" target="_blank">AS3046</a> DIP format chip is a direct replacement of old LM3046/CA3046 chip. Vbe is matched to +-1mV (LM3046 only to +-5mV). Another Moog Prodigy-clone is alive and with AS3046s the VCOs track at least 8-octaves (as much as I can get from Arturia MicroFreaks CV-out).<br />
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<tr><td class="tr-caption" style="text-align: center;">AS3046's are here right the 14-pin DIPs.</td></tr>
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<tr><td class="tr-caption" style="text-align: center;">This is the first version of my clone with old-style switches.</td></tr>
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-3121300862150383672020-06-21T05:35:00.001-07:002020-06-21T08:05:19.364-07:00Joystick MIDI-controllerToday you can buy cheap Arduino UNO R3 microcontroller copy from Velleman for just 15€. With two analog joysticks, Arduino with code, two resistors, wire, connectors and a Hofnar cigarette box you can build a simple MIDI-controller to control four parameters with two hands (MIDI CC).<br />
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-46497106043349586382020-05-26T22:25:00.001-07:002020-05-26T22:27:49.372-07:00From UPIC to IanniXYou can find here a free <a href="https://www.zkm.de/en/from-xenakiss-upic-to-graphic-notation-today" target="_blank">PDF-download</a> of a book of UPIC and Iannis Xenakis. UPIC was a computer/software system that enabled sounds to be generated from graphic structures. First working version of UPIC was created in 1977. Today there is an open source software <a href="https://www.iannix.org/en/whatisiannix/" target="_blank">IanniX</a> that is based on Iannis Xenakis works.<br />
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<iframe allow="autoplay; fullscreen" allowfullscreen="" frameborder="0" height="240" src="https://player.vimeo.com/video/25041544" width="426"></iframe>
<a href="https://vimeo.com/25041544">Controlling audio</a> from <a href="https://vimeo.com/iannix">IanniX</a> on <a href="https://vimeo.com/">Vimeo</a>.Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-6404276660915639902020-05-26T00:17:00.001-07:002020-05-26T00:17:35.573-07:00Arturia MicroFreakBought this little synth because it has a capacitive keyboard with CV, gate and pressure outputs. I consider it also cheap. It's actually very nice synth with 4-voice paraphonics, Mutable synthesis, modulation matrix, arpeggiator and sequencer. Here it's speaking with Speech-synthesis.<br />
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<iframe allow="autoplay" frameborder="no" height="300" scrolling="no" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/828143176&color=%23ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&show_teaser=true&visual=true" width="100%"></iframe><br />
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<a href="https://soundcloud.com/sigma" style="color: #cccccc; text-decoration: none;" target="_blank" title="Sigma">Sigma</a> · <a href="https://soundcloud.com/sigma/microfreakspeak" style="color: #cccccc; text-decoration: none;" target="_blank" title="MicroFreak Speaking">MicroFreak Speaking</a><br />
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Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-40721548977614315062020-03-30T21:49:00.001-07:002020-03-30T21:49:22.262-07:00Voix Celeste is releasedVoix Celeste is now released on Bandcamp and streaming services. Enjoy !<br />
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-9365909932974438482020-03-24T00:23:00.000-07:002020-03-24T00:23:11.834-07:00Voix HumanaFree taste of the 31.3.2020 MANU-album.<br />
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<iframe allow="autoplay" frameborder="no" height="300" scrolling="no" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/782115949&color=%23ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&show_teaser=true&visual=true" width="100%"></iframe>Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-90244613725089150292020-02-06T09:06:00.002-08:002020-02-06T09:06:57.431-08:00Voix CelesteNew solo-CD of MANU is coming out soon. It contains seven new compositions and one cover song. Voix Celeste (it's also an organ stop) is about silence and silent music. Silence is not just physical absence of sound. It's a state of mind that music creates in the mind of the listener. Silence can stand for a definite kind of presence rather than absence. Cover picture is edited from Robert Fludd's (1574-1637) Sun de metaphysico macrosmi (Wellcome Library, Creative Commons license).<br />
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-78204625368130083352020-02-04T20:46:00.001-08:002020-02-04T20:49:13.688-08:00Cristal BaschetWhat an magical instrument! Developed by Baschet brothers in the early 1950's. Here Peter Pringle plays his DIY version of this instrument and Ethervox Theremin. Basic sound is generated by dipping your fingers in water and rubbing them along a series of glass rods. These glass rods are connected to metal resonators that amplify the sound and create additive harmonics.<br />
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This other video shows two baschets (basic and bass versions) playing Erik Saties Gnossienne no1. Here you can see how wet those rods are. Interesting harmony between human, water, glass and metal.<br />
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<iframe allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/8cmzjIkx6b8" width="560"></iframe>
Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-66693275853890797112019-10-27T10:29:00.000-07:002019-10-27T10:29:06.880-07:00Picturesque 21Buchla inspired track. This started from exploration of Allen Stranges patch number 21.<br />
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<iframe allow="autoplay" frameborder="no" height="300" scrolling="no" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/702463951&color=%23ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&show_teaser=true&visual=true" width="100%"></iframe>Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-52857316114710662152019-10-26T00:33:00.001-07:002019-10-26T00:37:20.428-07:00Buchla 208 summa summarumThere was only one thing that didn't work as supposed in this build. Sequencer didn't operate correctly in the 3-stage mode (it worked as a 2 step sequence). 4 and 5 step stages worked ok. I changed the 4009 CMOS chip and after that everything worked as supposed!<br />
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Complex oscillators coarse slider useful range was only about the first half travel. I made the <a href="https://modularsynthesis.com/roman/buchla208v2/208spss.htm" target="_blank">ModularSynthesis</a> modification and added a 82k series resistor with R45 to reduce the gain of the coarse slider. That fixed this problem.<br />
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This build cost me about 2100€. Building was fun and the documentation in <a href="https://electricmusicstore.com/blogs/build/12614717-stored-program-sound-source-model-208" target="_blank">ElectricMusicStore</a>, <a href="https://modularsynthesis.com/roman/buchla208v2/208spss.htm" target="_blank">ModularSynthesis</a>, <a href="http://www.muffwiggler.com/forum/viewtopic.php?t=174863&start=all&postdays=0&postorder=asc&sid=25d0fcaf24b5d97c3159018601dd7210" target="_blank">Muff Wiggler</a> and <a href="http://www.portabellabz.be/208pcb.html" target="_blank">PortaBellabz</a> helped a lot.Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-11655629274753999762019-10-20T08:08:00.000-07:002019-10-20T08:08:45.641-07:00Buchla Bongo-boxI made a programming card where random-voltage changes sequencers last step (just one resistor). This way the 5-step sequencer sounds like a longer sequencer and is more interesting. I also switched both lopass-gates serial (signal routing). There is internally a 180-degrees phase-shift between them so when I in the middle of this clip rise the LPG2-level same as the LPG1-level there happens some random phase-cancellations (random voltage opens the LPG2). This sounds like a delay or velocity control. There is no external effect in this clip. Just the internal spring-reverb.<br />
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<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.blogger.com/video.g?token=AD6v5dzviN6b2SplTaL8Wc8-yycqjq3dvqU6KChqgkVg0_UURJQ48oSm8D50TuLiRyyKOkKpT3mgro4BPxWxMyS64A' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div>
<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-66356218075255316312019-10-18T11:14:00.000-07:002019-10-18T11:14:57.852-07:00Metaprogramming the Electro OrganismI haven't enough banana cables so it is a good time to test the programming card. In Allen Stranges Buchla Easel manual there is a self-generating patch number 21.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihHJTkg-o2JRMze0z44wU3KwqpWqXnhpAMrxS48vIZk9_b-PdLTVePXskMs7yFzKugvxpmX_dKP5rC5WnKwC1Q_2dSuAd_bi0_h60CTU-u_nJCQ0q0lDsV98JVfU_4ax8cX5q8ls7nvnU/s1600/Untitled.jpeg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="672" data-original-width="1600" height="167" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihHJTkg-o2JRMze0z44wU3KwqpWqXnhpAMrxS48vIZk9_b-PdLTVePXskMs7yFzKugvxpmX_dKP5rC5WnKwC1Q_2dSuAd_bi0_h60CTU-u_nJCQ0q0lDsV98JVfU_4ax8cX5q8ls7nvnU/s400/Untitled.jpeg" width="400" /></a></div>
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I made a programming that based in this patch. Buchla is in both-mode (prog board + front panel). Random-voltage controls number-of-sequencer-steps, envelope-attack/decay and MO-modulation-mode.Sequencer controls MO-frequency and envelope generator controls lopass-gate1-level. Remaining connections are made with banana-cables. I adjusted the faders to my taste and here is the resulting sound-video.<br />
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-31479618770172869482019-10-17T06:31:00.002-07:002019-10-17T06:31:54.958-07:00Buchla calibrationNow Buchla is roughly in tune (1V/Oct) and calibrated. I changed R3 from 10k to 8.2k. This slighty decreases timbre folding and helped the calibration. The trickiest part was to balance the CO-timbre (motherboard TR4) and CO-waveshape (motherboard TR7) with Card9's TR5 (CO low freq track). The problem was to get pure sine-waveshape from bottom to top without any extra oscillations when applying the maximum timbre fold.<br />
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I calibrated CO and MO to 1V/Oct with trimmers TR8 and TR9 on motherboard. External CV must be connected to voltage input from keyboard banana-jack. Here is one sound example with long attack/decay times and with random AM-modulation of CO. Some external reverb is used.<br />
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-56534483817225690882019-10-09T02:04:00.000-07:002019-10-09T02:04:17.772-07:00Buchla is alive!It's alive and creating sounds! Next I start to calibrate it. At the same time I check that everything is working. I love the outlook of this thing. It's like a synthesist's candy.<br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPVIVlJBiotADEcd1ax98QlRPHgi5U3fmD2KTIllId71uPzG51c9jH2lwW_kkjcdH1PUXZEQgAoqNm3ESex9L7AwM_yUtgnOJ3uWQ-i_xEm75oTYF4B1nrkh3unCRPbDw4qc3ViovQe9s/s1600/IMG_0208.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="676" data-original-width="1600" height="168" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPVIVlJBiotADEcd1ax98QlRPHgi5U3fmD2KTIllId71uPzG51c9jH2lwW_kkjcdH1PUXZEQgAoqNm3ESex9L7AwM_yUtgnOJ3uWQ-i_xEm75oTYF4B1nrkh3unCRPbDw4qc3ViovQe9s/s400/IMG_0208.jpg" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Colors of the sound!</td></tr>
</tbody></table>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjG57QANw_YqVNi7kR8Wgomeq_yi5IddOrxwTJ02x7ayBDrpxq3mnhyplI17a5dg01waYjR-dCDLUnXQ0Auy8eHDxfVSzYPxIhz3dpay9MdoeSKaeZ8rtQpf0-HLgD0Rsz9xcn0L9BAMaA/s1600/IMG_0211.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="1067" data-original-width="1600" height="266" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjG57QANw_YqVNi7kR8Wgomeq_yi5IddOrxwTJ02x7ayBDrpxq3mnhyplI17a5dg01waYjR-dCDLUnXQ0Auy8eHDxfVSzYPxIhz3dpay9MdoeSKaeZ8rtQpf0-HLgD0Rsz9xcn0L9BAMaA/s400/IMG_0211.jpg" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Here in the middle are the calibration trimmers of motherboard.</td></tr>
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-45320819807392361802019-09-29T08:13:00.000-07:002019-09-29T08:13:13.876-07:00Buchla front panel and motherboardI found the front panel from <a href="http://thebeast.co.uk/?product=buchla-style-208-panel-silver-2mm" target="_blank">The Beast</a>. Everything fits great and this starts to look like a Buchla 208. Next I must finish the motherboard so that I can start to solder the banana jacks.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglc6ee8pSbGhItLtTUs_FWQXbUjUOnyCU_gLtHw1_YxANrTUrLqQQOGLoBDbvG5xNGDx_5M470z9js9Afvfww8FbpbKyvECHW2ol92yHPK8GgO02cq2CkKVMGziZaNcBZBRLug4rHlFPc/s1600/IMG_0170.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="669" data-original-width="1600" height="166" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglc6ee8pSbGhItLtTUs_FWQXbUjUOnyCU_gLtHw1_YxANrTUrLqQQOGLoBDbvG5xNGDx_5M470z9js9Afvfww8FbpbKyvECHW2ol92yHPK8GgO02cq2CkKVMGziZaNcBZBRLug4rHlFPc/s400/IMG_0170.jpg" width="400" /></a></div>
<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-24328370210737571212019-08-29T23:36:00.002-07:002019-08-29T23:40:23.859-07:00Buchla 208 status and the motherboardAll 12 cards are now ready. Next I will start the assembly of motherboard.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVlWmpB3k6wFQGTuWerpUEkBtgg-wbxtKQQIYy4ojHcXYvidRfzeFTL5ajfgh8ePBJBFo307K3QXXGJbE_EzHGSWsJeR3n6f537pTxpiVG_-7VmXoAc66GHEok6LCETIuKHoZFeE3f_sc/s1600/IMG_0153.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="683" data-original-width="1600" height="170" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVlWmpB3k6wFQGTuWerpUEkBtgg-wbxtKQQIYy4ojHcXYvidRfzeFTL5ajfgh8ePBJBFo307K3QXXGJbE_EzHGSWsJeR3n6f537pTxpiVG_-7VmXoAc66GHEok6LCETIuKHoZFeE3f_sc/s400/IMG_0153.jpg" width="400" /></a></div>
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Following traces has been added to this 2.1 version of motherboard PCB:<br />
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- trace between Molex 4A and Molex 3B<br />
- trace between Program Card pin7 and via<br />
- trace to Card 8 pin 11 instead of pin 12 is corrected by connecting these two pins on motherboard<br />
- trace between SW8 and SW10<br />
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To change the trigger threshold (Pulser, Sequencer, Envelope Generator) from 10V to 5V I will change R56 to 150k.<br />
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To enable my 208 to communicate with iProgram card I must do the following modifications:<br />
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- connectors B and 2 are connected together and grounded to Q (quiet/analog ground)<br />
- pin C is connected to +5V<br />
- pins D and 4 are connected together and grounded to N (noisy/digital ground)<br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeYRyC-LKFNOouv-edu1vF78Cz5hYmHK50mvzGQZ-jGNoK8a0JPAepnFWrzIAG2fRtdwoxO8vfSYjRNoehOXhsG7TTSj1KokTlAda554L1uin5BzH7S-jhSTsqTfW6oLTk4nyaR5xibwk/s1600/208_iprogram_compatibility.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="128" data-original-width="800" height="63" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeYRyC-LKFNOouv-edu1vF78Cz5hYmHK50mvzGQZ-jGNoK8a0JPAepnFWrzIAG2fRtdwoxO8vfSYjRNoehOXhsG7TTSj1KokTlAda554L1uin5BzH7S-jhSTsqTfW6oLTk4nyaR5xibwk/s400/208_iprogram_compatibility.jpg" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Photo by Modular Synthesis</td></tr>
</tbody></table>
I have cloned this motherboard (and all the cards) with all the corrections. Maybe I will build some day another 208 from my own PCBs.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJsyLudmZke5Gsc5TqwWEqht3_ASJybjECYFCx8lES2b4QAgvHnBClZroXnZ-DYthZmL7ZrAoT3YZj5hMVh0Q4u8qPXI8M6vFRQKZqkRPwtjd6cvHvdkDHojVcOFmfy3igZZdqfkln988/s1600/Motherboard+by+Manu.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="603" data-original-width="1600" height="150" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJsyLudmZke5Gsc5TqwWEqht3_ASJybjECYFCx8lES2b4QAgvHnBClZroXnZ-DYthZmL7ZrAoT3YZj5hMVh0Q4u8qPXI8M6vFRQKZqkRPwtjd6cvHvdkDHojVcOFmfy3igZZdqfkln988/s400/Motherboard+by+Manu.jpg" width="400" /></a></div>
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</style>Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-19692976482160227942019-08-28T10:07:00.001-07:002019-08-28T10:07:05.237-07:00Buchla Card 12I replaced the original Buchla Output-card with <a href="https://modularsynthesis.com/roman/boops_208_card12/boops_card12.htm" target="_blank">Boops Card 12 replacement</a>. The reverb circuit is here better designed by driving the tank with current instead of voltage. I used the Davebr <a href="https://modularsynthesis.com/roman/boops_208_card12/Boops%20Card12%20Mouser%20BOM.pdf" target="_blank">BOM</a> from ModularSynthesis. With this card it is possible to bring out the MO and CO separately but I think I am not going to do this and I must jumper edge pins 7 and 9, let's see.<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKzMdberZZNnSdL6EBOAGAguEE92J-RGk0qqe2gxET2WXCIyTtby_6ACb9RB2tvfnu-pCa5wPshnrkgh_xOzQKHAXeh02aR61JfHjta6OSuWJlvJl7ZDOxJxbYgOCKOTfSIwIeEnZDjYM/s1600/IMG_0149.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="608" data-original-width="1600" height="151" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKzMdberZZNnSdL6EBOAGAguEE92J-RGk0qqe2gxET2WXCIyTtby_6ACb9RB2tvfnu-pCa5wPshnrkgh_xOzQKHAXeh02aR61JfHjta6OSuWJlvJl7ZDOxJxbYgOCKOTfSIwIeEnZDjYM/s400/IMG_0149.jpg" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">TOP</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEizCkwYc092DTb-f6Hb94hIbrB0nRQR8v3EKGuYHObSVptkwVTaSQZ1lT1hVh2qNefRqS4GLUroX6Y2rzWq06E04CIGWdhV_gv3jvk0OyUkaAfl1jS6BiUk0i9dQoeRu918wyH_py2F1XY/s1600/IMG_0152.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="587" data-original-width="1600" height="146" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEizCkwYc092DTb-f6Hb94hIbrB0nRQR8v3EKGuYHObSVptkwVTaSQZ1lT1hVh2qNefRqS4GLUroX6Y2rzWq06E04CIGWdhV_gv3jvk0OyUkaAfl1jS6BiUk0i9dQoeRu918wyH_py2F1XY/s400/IMG_0152.jpg" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">BOTTOM</td></tr>
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-16392268744536190992019-08-27T10:44:00.001-07:002019-08-27T10:44:33.460-07:00Buchla Card 11Card 11 is the LPG2. I changed C4 from 1uF to 47uF. This allows lower frequency MO (modulation oscillator) modulation of CO (complex oscillator). I also matched the vactrols VT1 and VT2.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJ6gkqUaPHalWvZ2MF4Kwhlij8ocpCs3ztEdfAJrsmVIrLVA_aJHwpK6qZgP1NZm1hdZTzVofkGKfMY_6wjKjs-fTfsBFX3TfgYnTfpfCe5VRTovxwVWZeG1Lz1-hOqTwLpn2Y7ekiPj8/s1600/IMG_0148.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="634" data-original-width="1600" height="157" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJ6gkqUaPHalWvZ2MF4Kwhlij8ocpCs3ztEdfAJrsmVIrLVA_aJHwpK6qZgP1NZm1hdZTzVofkGKfMY_6wjKjs-fTfsBFX3TfgYnTfpfCe5VRTovxwVWZeG1Lz1-hOqTwLpn2Y7ekiPj8/s400/IMG_0148.jpg" width="400" /></a></div>
<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-50857393206872184222019-08-25T01:39:00.002-07:002019-08-25T01:39:34.513-07:00Buchla Card 10Card 10 contains the Preamplifier and LPG-1. Vactrols VT1 and VT2 needs to be matched. In <a href="http://electro-music.com/forum/topic-29016-175.html" target="_blank">electro-music forum</a> I found an other matching method where vactrols are connected in series and LDRs form a voltage divider between +V and -V. In theory the more similar vactrols are the closer to 0V the output will be. Pulse LFO worked the best and I managed to match to pairs of vactrols for Card 10 and 11. I cross-checked this to the first matching method with Card 5 and these give similar results.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8G-6M10hyphenhyphenlnjYI6dPxw6mLFaZncc6lmTs79u9EAuCzgkXuSy2t8DWtGZEi03v1pcZIXXh8ruka8C63SaS9HZlJ6wQJ9oUtpIYXrC7wqXdlyxBjUuyd7-hX4pF7QGg8H7wZPSMzsyzKmg/s1600/IMG_0147.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="625" data-original-width="1600" height="156" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8G-6M10hyphenhyphenlnjYI6dPxw6mLFaZncc6lmTs79u9EAuCzgkXuSy2t8DWtGZEi03v1pcZIXXh8ruka8C63SaS9HZlJ6wQJ9oUtpIYXrC7wqXdlyxBjUuyd7-hX4pF7QGg8H7wZPSMzsyzKmg/s400/IMG_0147.jpg" width="400" /></a></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDp3C-Ffx4_ryfF-dpMuW3g2nTpxKBeW_X3xoLh7kiLVm1MZ-r5u58-YXvYxJ0lyLvN-sQNVc7hI15316_JkB64VMpXtv4I5JfFNTcZLLyZzICWBnzYT8EURkVVjHoUeGu-IxDqjHmt7o/s1600/vactrol_matching.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="480" data-original-width="640" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDp3C-Ffx4_ryfF-dpMuW3g2nTpxKBeW_X3xoLh7kiLVm1MZ-r5u58-YXvYxJ0lyLvN-sQNVc7hI15316_JkB64VMpXtv4I5JfFNTcZLLyZzICWBnzYT8EURkVVjHoUeGu-IxDqjHmt7o/s320/vactrol_matching.jpg" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Vactrol matching.</td></tr>
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-88807918900099766012019-08-23T08:29:00.001-07:002019-08-23T08:30:44.055-07:00Buchla Card 9Card 9 is the last one of the three Complex Oscillator cards. No modifications in this card.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2OV5p0C4_EcI1FFO6VDBk6zxwGKEuYkXInCxYTAIOcwizdhku5OZDefZxuNUiK7JgFivwtRitaMg3Od-Q54CDh0cyYYPyL50HvsDrkKEDRwMLjpfkoNFIJJeWy4lMPgBAc5FerCaQA0Y/s1600/IMG_0145.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="624" data-original-width="1600" height="155" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2OV5p0C4_EcI1FFO6VDBk6zxwGKEuYkXInCxYTAIOcwizdhku5OZDefZxuNUiK7JgFivwtRitaMg3Od-Q54CDh0cyYYPyL50HvsDrkKEDRwMLjpfkoNFIJJeWy4lMPgBAc5FerCaQA0Y/s400/IMG_0145.jpg" width="400" /></a></div>
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Now I have done 75% of this card show (Cards 1-9). So only three cards is left. Then I can populate the motherboard PCB.<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgymABxQNhQyrbu9VUCKJltdv7lDxCj4B9JUcHbGtLZn7z0gqwE1u1LE7wmI-_hB03vbAE3WfpGZdEosA_KdN0cH84yCuELklibd04dXH6m0hvo4xb0csJBiylC1ZcaqJkTzWTVsns0kso/s1600/IMG_0146.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="1442" data-original-width="1600" height="288" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgymABxQNhQyrbu9VUCKJltdv7lDxCj4B9JUcHbGtLZn7z0gqwE1u1LE7wmI-_hB03vbAE3WfpGZdEosA_KdN0cH84yCuELklibd04dXH6m0hvo4xb0csJBiylC1ZcaqJkTzWTVsns0kso/s320/IMG_0146.jpg" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Buchla flower</td></tr>
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-18390068496452427362019-08-22T09:59:00.000-07:002019-08-22T09:59:03.532-07:00Buchla Card 8Card 8 is the Complex Oscillator (Part 2). I matched diodes D1/D2, resistors R36/R37 and resistors R38/R39. The better these match the better the sine-shaper works. Pin 11/12 error is corrected in V2.1 motherboard PCB so there is no need to correct it in here. Capacitor C1 defines the frequency range of CO (lower values shift the range upwards). I leaved the C1 as it is in the original 208.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGUN9FULg_pM_fBwKHL5MrUoz6DxIA8pSKQTH-hU5wllg_myAZK1UjG5biA2sKziPqTsQ1NNDgEDdu29cogChjEUffKFEmlxblt0QljWl3zKtxQzgLOWfFwkqvxJb6aTFaehLGIfPO5DY/s1600/IMG_0143.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="605" data-original-width="1600" height="151" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGUN9FULg_pM_fBwKHL5MrUoz6DxIA8pSKQTH-hU5wllg_myAZK1UjG5biA2sKziPqTsQ1NNDgEDdu29cogChjEUffKFEmlxblt0QljWl3zKtxQzgLOWfFwkqvxJb6aTFaehLGIfPO5DY/s400/IMG_0143.jpg" width="400" /></a></div>
<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-81335651013179099562019-08-19T23:10:00.000-07:002019-08-22T10:08:21.056-07:00Buchla Card 7Card 7 is the first in Complex Oscillator series (Cards 7-9). Some resistor values needs tweaking. I changed R14 from 120k to 68k for 1V/oct tracking. R46 value depends on VT2 variations, so this can be anything between 15k and 1k. I changed R3 from 1.8k to 10k which is the original value in schematics. I installed also another uA726 replacement pcb on this card.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRsmduCJ5jlLd6EJZzSuBSGkBCH-Up3iOtKw25YwtkXpmen9qe4GvIE3qRcjmIbpeWpU9gihJX07EAglRd30s-l80tK52pv7oVkPHv_RkyJZx_60Gnfr-K9UVEmTHtEQRvLCb7nHRSXsI/s1600/IMG_0140.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="628" data-original-width="1600" height="156" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRsmduCJ5jlLd6EJZzSuBSGkBCH-Up3iOtKw25YwtkXpmen9qe4GvIE3qRcjmIbpeWpU9gihJX07EAglRd30s-l80tK52pv7oVkPHv_RkyJZx_60Gnfr-K9UVEmTHtEQRvLCb7nHRSXsI/s400/IMG_0140.jpg" width="400" /></a></div>
<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-85037231841786306312019-08-15T07:46:00.001-07:002019-08-22T10:08:38.657-07:00Buchla Card 6Card 6 is the Modulation Oscillator. There is one jumper wire. I matched the two 2N3565 NPN transistors with Ian Fritz <a href="https://web.archive.org/web/20151002134800if_/http://home.comcast.net/~ijfritz/MiscProj/transmat001.pdf">circuit</a>. <a href="https://kassu2000.blogspot.com/2015/10/transistor-matching.html?m=1">Kassutronics</a> has also a good article about this matching method. I managed to match these transistors within 0.5mV (Vbe). There are a couple of resistors that needs to be determined empirically. I changed R5 from 190k to 82k to tune MO to 1V/oct. I also changed R9 from 240k to 330k to rise the MO base frequency. When I calibrate MO I can see if these values are ok. The uA726 is replaced with my <a href="http://sigmambient.blogspot.com/2019/06/ma726.html">mA726</a> PCB.<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEip4_RSumEis5iHeiBKs4ZNuhKAToMaE3PRjXlt3jVqG7N7plVslUuugjoxuVNVBPJAf-MJVExvaDGyUAHnB5hxm6eWkDVpw2GrVjH-bRO1EwlS8OrjGgQP3JBvNpLsklVSsNK9rwxcwhg/s1600/IMG_0136.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="1067" data-original-width="1600" height="213" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEip4_RSumEis5iHeiBKs4ZNuhKAToMaE3PRjXlt3jVqG7N7plVslUuugjoxuVNVBPJAf-MJVExvaDGyUAHnB5hxm6eWkDVpw2GrVjH-bRO1EwlS8OrjGgQP3JBvNpLsklVSsNK9rwxcwhg/s320/IMG_0136.jpg" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Matching 2N3565 transistors.</td></tr>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj6hhms62BNJJwdtD9lWhqwdfoh3qll-dZWh_ggCVvXfxgZCamlnqsnkBwGXJNOvlepQDZ2lmLcp55FXaZhOk-XjQNX4GMp76iGEjJT9faXsM38PyZ75W4Ww8RnruPMpHC7kfiR-XJQGig/s1600/IMG_0137.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="565" data-original-width="1600" height="140" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj6hhms62BNJJwdtD9lWhqwdfoh3qll-dZWh_ggCVvXfxgZCamlnqsnkBwGXJNOvlepQDZ2lmLcp55FXaZhOk-XjQNX4GMp76iGEjJT9faXsM38PyZ75W4Ww8RnruPMpHC7kfiR-XJQGig/s400/IMG_0137.jpg" width="400" /></a></div>
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0tag:blogger.com,1999:blog-325698215871927248.post-73793070001446147492019-08-11T02:03:00.000-07:002019-08-22T10:09:04.593-07:00Buchla Cards 1-5Almost halfway with the 12 cards. Nothing special with card 2 (Random Voltage). This card has one jumper wire.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEix_okuG2Y2GmVnTSn2QRs3UAbo58AeOKbA9hoyyImYv_uiFRkVz1zoQA1UyEf-P5opx3mqDzYF1l0Jd-3UJcze_Dg9Dp49JcMbebeh7No0GhIFoemnI4oY8gKSVpGF32ccrcQcRRd6F7Q/s1600/IMG_0133.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="929" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEix_okuG2Y2GmVnTSn2QRs3UAbo58AeOKbA9hoyyImYv_uiFRkVz1zoQA1UyEf-P5opx3mqDzYF1l0Jd-3UJcze_Dg9Dp49JcMbebeh7No0GhIFoemnI4oY8gKSVpGF32ccrcQcRRd6F7Q/s400/IMG_0133.jpg" width="231" /></a></div>
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Cards 3 (Envelope Generator) and 4 (Pulser) can have problems with bleed into the audio. This is caused mainly by LEDs that take a lot of current. I cut the traces on bottom side to the driver transistors 2N1711 and soldered 1k resistors across the cuts to drop the currents. In card 3 I also added a 100pF capacitor across IC1 pins 12 and 14 to tame possible oscillations. Card 3 has two jumper wires.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYhhVpsED4gjpZBcTTlOz6fD-aCCKoAT9rDIVrUI4Xq8H4Y5BuZ8oupvT8oFadgwYJUWHAmVxH8xazjVWi9c0MO7ebIetmAhz6OgAiOkv1nD6ja4M7HshzZFFQdh5ImLLQMVdmxGVTkUo/s1600/IMG_0134.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1125" data-original-width="1600" height="224" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYhhVpsED4gjpZBcTTlOz6fD-aCCKoAT9rDIVrUI4Xq8H4Y5BuZ8oupvT8oFadgwYJUWHAmVxH8xazjVWi9c0MO7ebIetmAhz6OgAiOkv1nD6ja4M7HshzZFFQdh5ImLLQMVdmxGVTkUo/s320/IMG_0134.jpg" width="320" /></a></div>
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Card 5 (Balanced Modulator) has seven vactrols. Vactrols 1/2, 3/4 and 5/6 need to be matched. With this simple test-circuit I measured the on-resistance of the LDR.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixWKtyyDoxqnD9gYz5k2x19L3glUSjEZc1ZIDpti_RNTt-kvlhyphenhyphenjJVQmtUdcPk6-495xFJgkLpI95ldBP5Xf0XV1nb6kgCqVFyreNBKI-va2_PNwnT4OfNZO4KVPPD0ZXbQf3qKYqVo-M/s1600/IMG_0132.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1067" data-original-width="1600" height="213" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixWKtyyDoxqnD9gYz5k2x19L3glUSjEZc1ZIDpti_RNTt-kvlhyphenhyphenjJVQmtUdcPk6-495xFJgkLpI95ldBP5Xf0XV1nb6kgCqVFyreNBKI-va2_PNwnT4OfNZO4KVPPD0ZXbQf3qKYqVo-M/s320/IMG_0132.jpg" width="320" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgK3JWWyEQ3vziBeMCH797dpbFEoEpdnCxt3FLWet95S9keuVr3pdnWTA0D6cU3P-b9lErkBSifcsXVNHXP8P4ogaNmQxn5RGZk0pNhcK1j05XylTwpV35xlTEC6Q3U-xmnMTzDdJLTzzc/s1600/IMG_0135.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="755" data-original-width="1600" height="150" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgK3JWWyEQ3vziBeMCH797dpbFEoEpdnCxt3FLWet95S9keuVr3pdnWTA0D6cU3P-b9lErkBSifcsXVNHXP8P4ogaNmQxn5RGZk0pNhcK1j05XylTwpV35xlTEC6Q3U-xmnMTzDdJLTzzc/s320/IMG_0135.jpg" width="320" /></a></div>
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Resistance keeps rising as long as the LED is on. This is because the LED warms the LDR and this changes the resistance. I measured the lowest resistance when the vactrol was fired on. On REV2.1 cards there is a small pad added that indicates where the positive (+) lead of the vactrols LED should be inserted.<br />
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<br />Manuhttp://www.blogger.com/profile/14975173119939643586noreply@blogger.com0