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<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">If you have a look with the kemet tool for lets say a 100nF / 10V in 0402 and X7R you will see that the capacitance is -37% at the nominal 10V voltage…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">So maybe the bias effect is a BIT BETTER NOW BUT IT IS STILL HERE1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Ciao<br>
Peter<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="DE">Von:</span></b><span lang="DE"> Synth-diy <synth-diy-bounces@synth-diy.org>
<b>Im Auftrag von </b>ben gebhardt via Synth-diy<br>
<b>Gesendet:</b> Freitag, 8. </span><span lang="EN-US">Jänner 2021 16:15<br>
<b>An:</b> synth-diy@synth-diy.org<br>
<b>Betreff:</b> *EXT* Re: [sdiy] VCF caps in modern synths<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">My rules of thumb for capacitors is always evolving. Currently:<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">NP0 when economically viable. Always when 10n or less. NP0's above 10n are getting more affordable now, I would definitely have this as a first choice for any time
constant or filter.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">I've used SMD film caps for the 10n to 1u range. A former colleague has assembly issues with them, but I believe that was maybe CM related as they've never cause
me grief.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">I've also alternatively used THRU-box film caps as they are cheaper usually (even with an assembly cost up).<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">I've stayed away from X7R for the past few years, the more I learn about them, more more they seem problematic for anything except bulk capacitance. I'll have to
investigate this notion that they are no longer microphonic.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">I would like to believe DC bias doesn't affect capacitance as Mike has indicated, and yet Murata's website has an FAQ page about this topic and that graph doesn't
look pretty:<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue""><o:p> </o:p></span></p>
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<p class="MsoNormal"><a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.murata.com%2Fen-us%2Fsupport%2Ffaqs%2Fproducts%2Fcapacitor%2Fceramiccapacitor%2Fchar%2F0005&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7C53c351e5c1154a527b6608d8b3e8b614%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C0%7C637457159359564293%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=79FXMoYEc8rnZCRKOh0Z6wi32dkPysfcCjPvd%2B2MV84%3D&reserved=0" target="_blank"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">Does
the capacitance change when a DC voltage is applied to ceramic capacitors? Are there any points to be aware of regarding changes in the capacitance? | Murata Manufacturing Co., Ltd.</span></a><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue""><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">Seems they've incorporated this into their web-sim engine. Doesn't seem like dated material to me. (I'd like to be proven wrong! it would make my designs much cheaper)<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">Also, in my understanding capacitor related distortion doesn't show up with traditional steady-state sine based THD measurements. <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">Off topic but regarding SMD resistor distortion, I disagree that "In fact it is SMD resistors that have become the main source of distortion in surface mount products."
I think this is an over-generalization.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A">On Friday, January 8, 2021, 09:42:15 AM EST, Mike Bryant <</span><a href="mailto:mbryant@futurehorizons.com"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">mbryant@futurehorizons.com</span></a><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A">>
wrote: <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A">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:</span><a href="mailto:synth-diy-bounces@synth-diy.org"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">synth-diy-bounces@synth-diy.org</span></a><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A">]
On Behalf Of mark verbos<br>
Sent: 08 January 2021 14:15<br>
To: </span><a href="mailto:synth-diy@synth-diy.org"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">synth-diy@synth-diy.org</span></a><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A"><br>
Subject: Re: [sdiy] VCF caps in modern synths<br>
<br>
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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<br>
Mark<br>
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> On Jan 7, 2021, at 9:19 PM, ColinMuirDorward <</span><a href="mailto:colindorward@gmail.com"><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue"">colindorward@gmail.com</span></a><span lang="EN-US" style="font-size:10.0pt;font-family:"Helvetica Neue";color:#26282A">>
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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