<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="">OTA-based phaser designs are about the only application I can think of where the OTA functions like a resistor rather than a VCA. Even then it’s perhaps arguable.<div class=""><br class=""></div><div class="">Have a look at schematics for the EH Small Stone and the many subsequent derivatives.There’s also a good explanation on R.G.Keens page about phasers:</div><div class=""><br class=""></div><div class=""><a href="http://www.geofex.com/article_folders/phasers/phase.html" class="">http://www.geofex.com/article_folders/phasers/phase.html</a></div><div class=""><br class=""></div><div class="">HTH,</div><div class="">Tom</div><div class=""><br class=""><div class="">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">==================<br class=""> Electric Druid<br class="">Synth & Stompbox DIY<br class="">==================</div></div>
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<div><br class=""><blockquote type="cite" class=""><div class="">On 8 Feb 2020, at 09:58, Didier Leplae via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">I am curious to know anyone’s opinions on using the LM13700 as a voltage controlled resistor. <br class=""><br class="">The LM13700 datasheet has a couple schematics which I have tried building, with mixed results. I’m having a hard time knowing what sort of resistance I am getting as the multimeter gives strange and inconsistent readings.<br class=""><br class="">The information on the datasheet is somewhat incomplete in my opinion and it is not easy to find much info online either.<br class=""><br class="">It doesn’t seem like it is common practice to use these as VC resistors. Is that because it doesn’t work very well? Or use too many parts?<br class=""><br class="">Any insight on this would be appreciated.<br class="">I’m interested mostly in the single ended schematic at the moment.<br class=""><br class="">Thank you,<br class=""><br class="">Didier<br class=""><br class=""><br class=""><br class="">_______________________________________________<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=""></div></div></blockquote></div><br class=""></div></body></html>