<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Yeah, lots of interesting timbres. Mostly I just use the morphers, though. I have them built into a couple of Saw-core VCOs, and they typically drive multiple pulse waveshapers. So the up- and down-ramps produce different pulse patterns. There is a video on my youtube channel showing a drone patch using one of these modules.</div><div dir="ltr"><br></div><div dir="ltr">Ian</div><div dir="ltr"><br>On Feb 8, 2020, at 8:49 PM, Didier Leplae <<a href="mailto:didierleplae@yahoo.com">didierleplae@yahoo.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="content-type" content="text/html; charset=utf-8"><div dir="ltr">BTW, the SNICSter looks super interesting!</div><div dir="ltr"><br><blockquote type="cite">On Feb 8, 2020, at 9:19 PM, Ian Fritz <<a href="mailto:ijfritz@comcast.net">ijfritz@comcast.net</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="content-type" content="text/html; charset=utf-8"><div dir="ltr"><span></span></div><div dir="ltr"><span>It looks like the reply I sent earlier didn’t make it through. I used an OTA as a VC resistor a while back. Didn’t have any trouble with it, although IIRC the range was a bit limited. Certainly did not need AC coupling. Does anyone else have actual experience in incorporating one in a design?</span></div><div dir="ltr"><a href="http://ijfritz.byethost4.com/sy_cir10.htm">http://ijfritz.byethost4.com/sy_cir10.htm</a></div><div dir="ltr"><br></div><div dir="ltr">Ian<br><span></span><br><span></span><br><blockquote type="cite"><span>On Feb 8, 2020, at 6:25 PM, Didier Leplae via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>René,</span><br></blockquote><blockquote type="cite"><span>Sorry for my ignorance, but when you say “ Use Iabc to get gm (19.2*Iabc = gm), and the rest should be easy.”</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>What is “labc”?</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><blockquote type="cite"><span>On Feb 8, 2020, at 11:51 AM, René Schmitz <<a href="mailto:synth@schmitzbits.de">synth@schmitzbits.de</a>> wrote:</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Hi Didier and all,</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>On 08.02.2020 10:58, Didier Leplae via Synth-diy wrote:</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>I am curious to know anyone’s opinions on using the LM13700 as a voltage controlled resistor.</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>The LM13700 datasheet has a couple schematics which I have tried building, with mixed results. I’m having a hard time knowing what sort of resistance I am getting as the multimeter gives strange and inconsistent readings.</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>The information on the datasheet is somewhat incomplete in my opinion and it is not easy to find much info online either.</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Yes, it doesn't tell you the fact that the resistor is AC coupled (single ended circuit). See the Cap at the output...</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>So poking around with a multimeter is not going to give meaningful results.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>But the formula for Rx is given. Use Iabc to get gm (19.2*Iabc = gm), and the rest should be easy.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><blockquote type="cite"><span>It doesn’t seem like it is common practice to use these as VC resistors. Is that because it doesn’t work very well? Or use too many parts?</span><br></blockquote></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Wouldn't be my first choice due to complexity and parts count.</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>Best,</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>René</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span>--</span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="mailto:synth@schmitzbits.de">synth@schmitzbits.de</a></span><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><span><a href="http://schmitzbits.de">http://schmitzbits.de</a></span><br></blockquote></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>_______________________________________________</span><br></blockquote><blockquote type="cite"><span>Synth-diy mailing list</span><br></blockquote><blockquote type="cite"><span><a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a></span><br></blockquote><blockquote type="cite"><span><a href="http://synth-diy.org/mailman/listinfo/synth-diy">http://synth-diy.org/mailman/listinfo/synth-diy</a></span><br></blockquote></div></div></blockquote></div></blockquote></body></html>