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<body style="overflow-wrap:break-word; word-break: break-word;"><div class="mail_android_message" style="line-height: 1; padding: 0.5em">Hi All,<br/><br/>NP0/C0G has almost no voltage coefficient (it's the best): <a href="https://www.avx.com/products/ceramic-capacitors/surface-mount/c0g-np0">https://www.avx.com/products/ceramic-capacitors/surface-mount/c0g-np0</a>/<br/><br/>Justin Herrmann </div><div class="mail_android_quote" style="line-height: 1; padding: 0.3em"><html><body>On 3/28/21, 10:10 AM cheater cheater <cheater00social@gmail.com> wrote:</body></html><blockquote class="gmail_quote" style="margin: 0.8ex 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
On Sun, Mar 28, 2021 at 4:47 PM Mattias Rickardsson <mr@analogue.org> wrote:
<br> > I've never heard of aspers before, but it seems to refer to modulation in the lower audio frequencies (20-300 Hz) rather than harmonic distortion: <a href="https://community.sw.siemens.com/s/article/sound-modulation-metrics-fluctuation-strength-and-roughness">https://community.sw.siemens.com/s/article/sound-modulation-metrics-fluctuation-strength-and-roughness</a>
<br>
<br> Your article talks about roughness in a very specific situation. See
<br> the parallel thread for a paper by Hoeldrich which measures roughness
<br> in full-band.
<br>
<br> >> alternatively go to something like mV range and have a much more linear, tiny, capacitor - but at the cost of EMI adding a bunch of noise. Your choice. Fully-balanced synths anyone?
<br> >
<br> > since the self-modulation goes in the other direction for negative voltages, a straight-up balanced design wouldn't help much.
<br>
<br> The capacitance is reduced (i.e. affected in "the same direction") for
<br> both positive and negative voltages. The suggestion here was to have
<br> very low voltages. The balancing would be used to remove EMI noise
<br> from external interference. Not to cancel out the capacitance
<br> reduction.
<br>
<br> > Some research into the nonlinearities would be essential. Or why not go for C0G instead. :-)
<br>
<br> C0G are specifically the ones that have the extreme variation in
<br> capacitance based on applied voltage. They're the ones mentioned in
<br> the article. So going for C0G is the worst thing you can do. I'm not
<br> sure but I guess Colin's test was on a synth with NP0 capacitors or
<br> ones that are built very similarly. Most ceramic capacitors with high
<br> voltage ratings in a small package will be multi-layer, built just
<br> like C0GNP0.
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