<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">On Aug 23, 2019, at 12:16 PM, David Moylan via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:<br class=""><div><blockquote type="cite" class=""><br class="Apple-interchange-newline"><div class=""><div class="">Is this the Polivoks style filter?<br class=""><br class=""><a href="https://modularsynthesis.com/kuzmin/polivoks/polivoks_vcf.htm" class="">https://modularsynthesis.com/kuzmin/polivoks/polivoks_vcf.htm</a></div></div></blockquote><br class=""></div><div>Okay, that's a State Variable Filter with programmable op amps for the integrators.</div><div><br class=""></div><div>And a programmable op amp is basically an OTA, with an integration cap, and an output stage.</div><br class=""><div class="">
<div style="color: rgb(0, 0, 0); font-family: Menlo; 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-size-adjust: auto; -webkit-text-stroke-width: 0px;"> -- Don<br class="">--<br class="">Donald Tillman, Palo Alto, California<br class=""><a href="http://www.till.com" class="">http://www.till.com</a></div>
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