<div dir="ltr">My error - the VCO charged cap core is inside the feedback loop.<div><br></div><div>It is indeed a weird architecture - Jeremy Hill was really thinking outside the box!</div><div><br></div><div>MC</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sun, Jul 5, 2026 at 10:01 AM Mike Bryant <<a href="mailto:mbryant@futurehorizons.com">mbryant@futurehorizons.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg8798819476690825872">




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Does it really even need the linear to exp convertor ?  The feedback loop will force it to the correct frequency.  Portamento could just use a different charging function on the capacitor.</div>
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<b>From:</b> Neil Johnson <<a href="mailto:neil.johnson71@gmail.com" target="_blank">neil.johnson71@gmail.com</a>><br>
<b>Sent:</b> 05 July 2026 10:26<br>
<b>To:</b> Michael E Caloroso <<a href="mailto:mec.forumreader@gmail.com" target="_blank">mec.forumreader@gmail.com</a>><br>
<b>Cc:</b> Mike Bryant <<a href="mailto:mbryant@futurehorizons.com" target="_blank">mbryant@futurehorizons.com</a>>; SYNTH DIY <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>><br>
<b>Subject:</b> Re: [sdiy] GRP Genesi</div>
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<div style="direction:ltr">Michael E Caloroso wrote:</div>
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<div style="direction:ltr">US 3,930,429</div>
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<div style="direction:ltr">Don did a write-up of it here: <a href="https://till.com/articles/arp/patents.html#US03930429" id="m_8798819476690825872OWAa015bc9b-e899-6bf6-fc26-5073cda34b6d" target="_blank">
https://till.com/articles/arp/patents.html#US03930429</a></div>
<div style="direction:ltr">Very weird architecture indeed!</div>
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<div style="direction:ltr">Neil</div>
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