<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Curious, how was the second transistor hooked up?<div class=""><br class=""></div><div class=""><blockquote type="cite" class=""><div class=""><div class="moz-cite-prefix">The later MS20 had a second transistor, which makes things more linear/symmetrical and you can run larger amplitudes -> less noise. </div></div></blockquote><div class=""><br class=""></div><div class="">Andrey<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 7. Apr 2023, at 13:51, René Schmitz <<a href="mailto:synth@schmitzbits.de" class="">synth@schmitzbits.de</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
<div class="">
<div class="moz-cite-prefix"><p class="">You'll find the same VCA in the 909 in a few places. (Bassdrum
, Toms, Clap..)<br class="">
</p><p class="">Note how far the signal is divided down. <br class="">
</p><p class="">It's noisy, and nonlinear, and has some control feedthrough.
Show what you can get away with for a single monophonic signal.
<br class="">
</p>
</div>
<div class="moz-cite-prefix">The MS10 had the single transistor, the
early "Korg35" MS20 had the same. <br class="">
</div>
<div class="moz-cite-prefix">The later MS20 had a second transistor,
which makes things more linear/symmetrical and you can run larger
amplitudes -> less noise. <br class="">
</div>
<div class="moz-cite-prefix"><br class="">
</div>
<div class="moz-cite-prefix">According to the schematics the
transistors shall be selected. jx3p also says "SEL". <br class="">
</div>
<div class="moz-cite-prefix"><br class="">
</div>
<div class="moz-cite-prefix">Anyone would know what for? Equal gain?
<br class="">
</div>
<div class="moz-cite-prefix"><br class="">
</div>
<div class="moz-cite-prefix"><br class="">
</div>
<div class="moz-cite-prefix">Best,</div>
<div class="moz-cite-prefix"> René<br class="">
</div>
<div class="moz-cite-prefix"><br class="">
</div>
<div class="moz-cite-prefix">On 07.04.2023 11:04, Adam (synthDIY)
wrote:<br class="">
</div>
<blockquote type="cite" cite="mid:94A497D5-A2CA-4055-9459-E7063747EA64@adambaby.com" class="">
<meta http-equiv="content-type" content="text/html; charset=UTF-8" class="">
<meta http-equiv="content-type" content="text/html; charset=UTF-8" class="">
<div style="overflow-wrap: break-word; -webkit-nbsp-mode: space;
line-break: after-white-space;" class=""><br class="">
<div class="">David G Dixon via Synth-diy pisze:<br class="">
<blockquote type="cite" class="">
<div class="">
<blockquote type="cite" style="font-family: Helvetica;
font-size: 13px; font-style: normal; font-variant-caps:
normal; font-weight: 400; letter-spacing: normal;
orphans: auto; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<blockquote type="cite" class="">
<blockquote type="cite" class="">Whatever the VCA is in the
Korg MS-20 really warms up the sound of that
synthesizer. You can find the schematic on the
internet. I have something redrawn by a fellow
named Marjan Urekar that I looked at years ago. It
involves two transistors. It is evidently also the
VCA used in the Roland JX-3P.</blockquote>
</blockquote>
</blockquote>
</div>
</blockquote>
</div>
<br class="">
<div class=""><br class="">
</div>
<div class="">Interesting.... here's the JX3P version</div>
<div class=""><br class="">
</div>
<div class=""><span id="cid:part1.IjypEZTw.Md0gVlcO@schmitzbits.de"><grab 2023-04-07 at 6.57.54 pm.png></span></div>
</div>
</blockquote><p class=""><br class="">
</p>
<br class=""><p class=""><br class="">
</p><p class=""><br class="">
</p>
<blockquote type="cite" cite="mid:94A497D5-A2CA-4055-9459-E7063747EA64@adambaby.com" class="">
<br class="">
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Synth-diy mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a>
<a class="moz-txt-link-freetext" href="http://synth-diy.org/mailman/listinfo/synth-diy">http://synth-diy.org/mailman/listinfo/synth-diy</a>
Selling or trading? Use <a class="moz-txt-link-abbreviated" href="mailto:marketplace@synth-diy.org">marketplace@synth-diy.org</a>
</pre>
</blockquote><p class=""><br class="">
</p>
<pre class="moz-signature" cols="72">--
--
<a class="moz-txt-link-abbreviated" href="mailto:synth@schmitzbits.de">synth@schmitzbits.de</a>
<a class="moz-txt-link-freetext" href="http://schmitzbits.de/">http://schmitzbits.de</a></pre>
</div>
_______________________________________________<br class="">Synth-diy mailing list<br class=""><a href="mailto:Synth-diy@synth-diy.org" class="">Synth-diy@synth-diy.org</a><br class="">http://synth-diy.org/mailman/listinfo/synth-diy<br class="">Selling or trading? Use marketplace@synth-diy.org<br class=""></div></blockquote></div><br class=""></div></div></body></html>