<div dir="ltr">You mentioned an OTA based VCA. I have experienced some clicking with these in the past. Use a linearizing diode and calibrate the 1k trimpot (<a href="https://i.stack.imgur.com/5drhW.jpg">https://i.stack.imgur.com/5drhW.jpg</a>). That will rule out the VCA as the source of the click.<div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><font face="verdana, sans-serif" color="#444444"><b>Jacob Watters</b></font><div><font face="verdana, sans-serif" color="#444444"><a href="http://jacobwatters.com/" target="_blank">JacobWatters.com</a></font></div><div><span style="color:rgb(68,68,68)">Tel: 226-886-3526</span></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Aug 19, 2020 at 5:42 PM Didier Leplae 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><div style="font-family:verdana,helvetica,sans-serif;font-size:13px"><div dir="ltr">We are working on an analog drum module that uses a simple envelope created from a trigger to control the amplitude of a triangle oscillator with a basic OTA based VCA.</div><div dir="ltr"> </div><div dir="ltr">We are having a problem with a slight clicking sound at the beginning of many of the drum hits. We think this is because the attack of our envelope is so sharp that the beginning of our drum hit looks like a straight jump from 0V to wherever the triangle wave happens to fall. Therefore the click is somewhat random in that it doesn't occur when the triangle happens to be low at the time of attack.</div><div dir="ltr"><br></div><div dir="ltr">Can anyone suggest a simple way to deal with this, like adding a slight bit of attack time to the envelope? How could this be done without adding too many parts?</div><div dir="ltr"><br></div><div dir="ltr">Thanks,</div><div dir="ltr"><br></div><div dir="ltr">Didier</div></div></div>_______________________________________________<br>
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