[sdiy] VCF caps in modern synths

[ColinMuirDorward]

 >Was this SMD or through hole ?   It’s possibly down to lead inductance or
series resistance being higher in the C0G.

Both are throughhole. Polypropylene are red WIMA boxes and C0Gs are axial
leads.
If I get some time today I'll try to match some caps and run the test again.

On Fri, Jan 8, 2021 at 7:29 AM Mike Bryant <mbryant at futurehorizons.com>
wrote:

>
>
> >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?
>
>
>
> Was this SMD or through hole ?   It’s possibly down to lead inductance or
> series resistance being higher in the C0G.
>
>
>
>
>
> On Fri, Jan 8, 2021 at 6:37 AM Mike Bryant <mbryant at futurehorizons.com>
> wrote:
>
> 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.
>
>
> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of
> mark verbos
> Sent: 08 January 2021 14:15
> To: synth-diy at synth-diy.org
> Subject: Re: [sdiy] VCF caps in modern synths
>
> 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.
>
>
> Mark
>
>
>
>
>
> > On Jan 7, 2021, at 9:19 PM, ColinMuirDorward <colindorward at gmail.com>
> wrote:
> >
> >  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.
>
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