<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=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 22 Aug 2020, at 8:21 am, Chromatest J. Pantsmaker <<a href="mailto:chromatest@azburners.org" class="">chromatest@azburners.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">would a 9ms delay be any worse than a professional human drummer?</div></div></blockquote><div><br class=""></div><div>Maybe not, but a 9 ms effective “jitter” in a drum machine is unacceptable these days I think</div><div><br class=""></div><div>cheers</div><div>A</div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><br class=""><blockquote type="cite" class=""><div class=""><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 21, 2020 at 2:28 PM Mattias Rickardsson <<a href="mailto:mr@analogue.org" class="">mr@analogue.org</a>> wrote:<br class=""></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" class=""><div class="">Hi Jason,</div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 21 Aug 2020 at 22:39, Jason Nanna <<a href="mailto:jasonnanna@gmail.com" target="_blank" class="">jasonnanna@gmail.com</a>> wrote:<br class=""></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" class="">Would delaying the trigger until an oscillator zero-crossing be a simpler way to synchronize? Assuming a bipolar triangle, I don't think it matters whether it's rising or falling.<br class=""></div></blockquote><div class=""><br class=""></div><div class="">It would probably work, but would introduce undefined delays instead. For a boomy 55 Hz bass drum there could be anywhere between 0 and 9 ms delay, which I'd expect to be audible and untight...?</div><div class=""><br class=""></div><div class="">/mr</div><div class=""><br class=""></div><div class=""> </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" class=""></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 21, 2020 at 3:33 PM Jacob Watters <<a href="mailto:jacobwatters@gmail.com" target="_blank" class="">jacobwatters@gmail.com</a>> wrote:<br class=""></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" class="">Right. The linearizing is for noise, but the trimpot is the important part for thumping. I added the diode part to my suggestion because it is a good practice that I often see left out.<div class=""><br clear="all" class=""><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><font face="verdana, sans-serif" color="#444444" class=""><b class="">Jacob Watters</b></font><div class=""><font face="verdana, sans-serif" color="#444444" class=""><a href="http://jacobwatters.com/" target="_blank" class="">JacobWatters.com</a></font></div><div class=""><span style="color:rgb(68,68,68)" class="">Tel: 226-886-3526</span></div></div></div></div></div></div><br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 21, 2020 at 3:52 PM Dakota Melin <<a href="mailto:dksynth@gmail.com" target="_blank" class="">dksynth@gmail.com</a>> wrote:<br class=""></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=""><div dir="auto" class="">I think Jacob might be pointing out that if your VCA itself has DC offset problems that’ll thump as well. </div></div><div class=""><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 21, 2020 at 3:41 PM Tom Wiltshire <<a href="mailto:tom@electricdruid.net" target="_blank" class="">tom@electricdruid.net</a>> wrote:<br class=""></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="">How does use of the linearising diodes hep with the offset click?<div class=""><br class=""></div><div class="">I agree about eliminating the offset as a source of the click, since if the VCA thumps, it doesn’t;t matter what signal you feed it, or even if you feed it no signal at all, you’ll still hear a click, but I don’t see what the linearising diodes have to do with that.</div></div><div class=""><div class=""><br class=""></div><div class="">Tom</div><div class=""><br class=""></div><div class=""><br class=""><br class=""><div class=""><br class=""><blockquote type="cite" class=""><div class="">On 21 Aug 2020, at 20:25, Jacob Watters <<a href="mailto:jacobwatters@gmail.com" target="_blank" class="">jacobwatters@gmail.com</a>> wrote:</div><br class=""><div class=""><div dir="ltr" class="">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" target="_blank" class="">https://i.stack.imgur.com/5drhW.jpg</a>). That will rule out the VCA as the source of the click.<div class=""><br clear="all" class=""><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><font style="font-family:verdana,sans-serif;color:rgb(68,68,68)" face="verdana, sans-serif" class=""><b style="font-family:verdana,sans-serif" class="">Jacob Watters</b></font><div class=""><font style="font-family:verdana,sans-serif;color:rgb(68,68,68)" face="verdana, sans-serif" class=""><a href="http://jacobwatters.com/" style="font-family:verdana,sans-serif" target="_blank" class="">JacobWatters.com</a></font></div><div class=""><span style="color:rgb(68,68,68)" class="">Tel: 226-886-3526</span></div></div></div></div></div></div><br class=""></div></div><br class=""><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" target="_blank" class="">synth-diy@synth-diy.org</a>> wrote:<br class=""></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=""><div style="font-family:verdana,helvetica,sans-serif;font-size:13px" class=""><div dir="ltr" style="font-family:verdana,helvetica,sans-serif" class="">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" style="font-family:verdana,helvetica,sans-serif" class=""> </div><div dir="ltr" style="font-family:verdana,helvetica,sans-serif" class="">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" style="font-family:verdana,helvetica,sans-serif" class=""><br class=""></div><div dir="ltr" style="font-family:verdana,helvetica,sans-serif" class="">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" style="font-family:verdana,helvetica,sans-serif" class=""><br class=""></div><div dir="ltr" style="font-family:verdana,helvetica,sans-serif" class="">Thanks,</div><div dir="ltr" style="font-family:verdana,helvetica,sans-serif" class=""><br class=""></div><div dir="ltr" style="font-family:verdana,helvetica,sans-serif" class="">Didier</div></div></div>_______________________________________________<br class=""><br class=""><br class="">Synth-diy mailing list<br class=""><br class=""><br class=""><a href="mailto:Synth-diy@synth-diy.org" target="_blank" class="">Synth-diy@synth-diy.org</a><br class=""><br class=""><br class=""><a href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="noreferrer" target="_blank" class="">http://synth-diy.org/mailman/listinfo/synth-diy</a><br class=""><br class=""><br class=""></blockquote></div><br class=""><br class="">_______________________________________________<br class="">Synth-diy mailing list<br class=""><a href="mailto:Synth-diy@synth-diy.org" target="_blank" class="">Synth-diy@synth-diy.org</a><br class=""><a href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank" class="">http://synth-diy.org/mailman/listinfo/synth-diy</a><br class=""></div></blockquote></div><br class=""></div></div>_______________________________________________<br class=""><br class="">Synth-diy mailing list<br class=""><br class=""><a href="mailto:Synth-diy@synth-diy.org" target="_blank" class="">Synth-diy@synth-diy.org</a><br class=""><br class=""><a href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="noreferrer" target="_blank" class="">http://synth-diy.org/mailman/listinfo/synth-diy</a><br class=""><br class=""></blockquote></div></div>
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