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<div dir="ltr" data-setdir="false">My rules of thumb for capacitors is always evolving. Currently:</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">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.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">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.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I've also alternatively used THRU-box film caps as they are cheaper usually (even with an assembly cost up).</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">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.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">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:</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><a href="https://www.murata.com/en-us/support/faqs/products/capacitor/ceramiccapacitor/char/0005" rel="nofollow" target="_blank" class="enhancr_card_0295858793">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.</a><br></div><div><br></div><div dir="ltr" data-setdir="false">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)</div><div><br></div><div dir="ltr" data-setdir="false">Also, in my understanding capacitor related distortion doesn't show up with traditional steady-state sine based THD measurements. </div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Off topic but regarding SMD resistor distortion, I disagree that "<span><span style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif;">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.</span></span></div>
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On Friday, January 8, 2021, 09:42:15 AM EST, Mike Bryant <mbryant@futurehorizons.com> wrote:
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<div><div dir="ltr">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 clear="none"><br clear="none"><br clear="none">-----Original Message-----<br clear="none">From: Synth-diy [mailto:<a shape="rect" ymailto="mailto:synth-diy-bounces@synth-diy.org" href="mailto:synth-diy-bounces@synth-diy.org">synth-diy-bounces@synth-diy.org</a>] On Behalf Of mark verbos<br clear="none">Sent: 08 January 2021 14:15<br clear="none">To: <a shape="rect" ymailto="mailto:synth-diy@synth-diy.org" href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a><br clear="none">Subject: Re: [sdiy] VCF caps in modern synths<br clear="none"><br clear="none">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 clear="none"><br clear="none"><br clear="none">Mark<br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none">> On Jan 7, 2021, at 9:19 PM, ColinMuirDorward <<a shape="rect" ymailto="mailto:colindorward@gmail.com" href="mailto:colindorward@gmail.com">colindorward@gmail.com</a>> wrote:<br clear="none">> <br clear="none">> 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 clear="none"><br clear="none">_______________________________________________<br clear="none">Synth-diy mailing list<br clear="none"><a shape="rect" ymailto="mailto:Synth-diy@synth-diy.org" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br clear="none"><a shape="rect" href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br clear="none">Selling or trading? Use <a shape="rect" ymailto="mailto:marketplace@synth-diy.org" href="mailto:marketplace@synth-diy.org">marketplace@synth-diy.org</a><div class="yqt3226036204" id="yqtfd71025"><br clear="none"><br clear="none">_______________________________________________<br clear="none">Synth-diy mailing list<br clear="none"><a shape="rect" ymailto="mailto:Synth-diy@synth-diy.org" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br clear="none"><a shape="rect" href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br clear="none">Selling or trading? Use <a shape="rect" ymailto="mailto:marketplace@synth-diy.org" href="mailto:marketplace@synth-diy.org">marketplace@synth-diy.org</a><br clear="none"></div></div></div>
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