<div dir="ltr">I believe that this diode sinks the trigger input current (as seen by the + terminal of the LM3900) down when the end-of-cycle is low, so that the envelope cannot retrigger until the cycle ends.<div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, May 12, 2024 at 3:21 PM Paul Glass-Steel via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</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 dir="ltr">Hello all, <div><br></div><div>I'm trying to improve my understanding of the trigger and EG logic in the Serge DUSG (<a href="https://sdiy.info/wiki/CGS_Serge_dual_universal_slope_generator" target="_blank">https://sdiy.info/wiki/CGS_Serge_dual_universal_slope_generator</a>). I've read over Tim Stinchcombe's analysis (<a href="https://www.timstinchcombe.co.uk/index.php?pge=vcs" target="_blank">https://www.timstinchcombe.co.uk/index.php?pge=vcs</a>) many times but there's one component he does not touch on and I'm struggling to understand its roll.<br><br>At the trigger input A, after the usual series of conditioning resistors and capacitors, there is a diode conducting the pulse into the LM3900 pin 13. And there is a <i>second</i> diode just below it that leads to (from?) the output of the end-of-cycle comparator - this is the one I'd like to understand.</div><div><br></div><div>Thanks!</div><div><br></div><div>-Paul</div><div><br></div><div><img src="cid:ii_lw3k7uzp0" alt="image.png" width="542" height="226"><br></div></div>
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