[sdiy] VCF caps in modern synths
cheater cheater
cheater00social at gmail.com
Sun Mar 28 19:48:02 CEST 2021
Sorry, didn't finish reading - that's actually 5 authors, each of
which has commendable industry experience. I don't think there's any
reason to doubt their findings.
On Sun, Mar 28, 2021 at 7:46 PM cheater cheater
<cheater00social at gmail.com> wrote:
>
> I've seen other articles talking about exactly the same thing. It's a
> well known issue with multilayer capacitors. Read the author's bio (at
> the end of the article). Do you think this IEEE Fellow's obviously
> meticulous research is just some crackpot fantasy?
>
> On Sun, Mar 28, 2021 at 7:32 PM Gordonjcp <gordonjcp at gjcp.net> wrote:
> >
> > On Sun, Mar 28, 2021 at 03:52:37PM +0200, cheater cheater wrote:
> > > > On Mon, Jan 18, 2021 at 11:49 AM ColinMuirDorward <colindorward at gmail.com> wrote:
> > > > In my 4pole 3320 BPF, the polypropylenes sound slightly better. The obvious difference is that at lower frequency settings, they go into self-oscillation more readily than the ceramics. To my biased ear, the ceramics make some small distortion perhaps, or for some reason add a slight edge to the sound. I did do a blind test using a 2pole 2164 SVF and the difference there is more noticeable than in any other filter I've tested. Here, the polys are a clear win. I want to use words like "liquid, juicy, lush" for the polys vs "bite, edge, grit" for the ceramics. However those are too strong words to describe a very subtle difference. I am waiting to find the right modern mono synth that I can do a capacitor "upgrade" on and test if it's possible to perceive a change in the sound in a factory-made unit. I have an uno synth on the way (was on sale for $135cad?!), perhaps I'll be lucky enough to find space inside that tiny case for four WIMAs.
> > >
> > > The sound quality you're talking is "roughness" and is measured in Aspers.
> > >
> > > Tiny capacitors have a very large voltage gradient across a very short
> > > casing. They're probably self-modulating, i.e higher voltage means
> > > less capacitance. Essentially self-filter-FM.
> > >
> > > Look at this article:
> > > https://passive-components.eu/dc-and-ac-bias-dependence-of-mlcc-capacitors-including-temperature-dependence/
> > >
> >
> > Lots of pretty graphs, for sure.
> >
> > Has anyone attempted to reproduce these experiments?
> >
> > --
> > Gordonjcp
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