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>Was this SMD or through hole ? It’s possibly down to lead inductance or series resistance being higher in the C0G.</div><div style="margin-left:40px"><br></div><div>Both are throughhole. Polypropylene are red WIMA boxes and C0Gs are axial leads.</div><div>If I get some time today I'll try to match some caps and run the test again.<br></div>
</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 8, 2021 at 7:29 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">
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<p class="MsoNormal"><span style="color:rgb(31,73,125)">></span>Yesterday I did some very non-scientific testing of 3320 4pole BPF built using C0G vs polypropylenes. The test may have been more about the tolerances of the caps rather than the dielectric, since my
polys are 2.5% vs the C0Gs at 5%. I noticed that at lower frequencies, the polypropylene version would go into oscillation before the C0G version. Any thoughts on this?
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<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)">Was this SMD or through hole ? It’s possibly down to lead inductance or series resistance being higher in the C0G.<u></u><u></u></span></p>
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<p class="MsoNormal">On Fri, Jan 8, 2021 at 6:37 AM Mike Bryant <<a href="mailto:mbryant@futurehorizons.com" target="_blank">mbryant@futurehorizons.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Hehe. I remember I built a Moog ladder filter using 47nF X7Rs in the early 1980s and the capacitors were so bad back then it actually killed the Q so you couldn't get the thing to self-oscillate no matter how hard you tried. I expect
Behringer use newer versions in their Model D and get the right sound nowadays.<br>
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-----Original Message-----<br>
From: Synth-diy [mailto:<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank">synth-diy-bounces@synth-diy.org</a>] On Behalf Of mark verbos<br>
Sent: 08 January 2021 14:15<br>
To: <a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a><br>
Subject: Re: [sdiy] VCF caps in modern synths<br>
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why? If you like the sound of a filter that uses a certain (in this case “whatever” ) cap, why would you hope that manufacturers use something else? If you don’t like the sound, that is something different. Oddly, when I think of an SH-101 I think of something
that is almost too stable. <br>
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Mark<br>
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> On Jan 7, 2021, at 9:19 PM, ColinMuirDorward <<a href="mailto:colindorward@gmail.com" target="_blank">colindorward@gmail.com</a>> wrote:<br>
> <br>
> I would hope that today we at minimum have a predominance of C0G types since they don't cost much more than a cent each.<br>
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