[sdiy] C0G capacitor size differences?

[ChristianH]

Gee, the lo-fi folks will love it. Just shout at your filter, add a bit
of ooompf-chuck, and the dance floor crowd will go nuts. Even hipper than
all robot voices and Cher together.
Not.

Chris



On Fri, 25 Sep 2015 01:05:27 +0200 Mattias Rickardsson <mr at analogue.org>
wrote:

> I've heard the microphonics in a pair of X7R caps mistakenly placed as the
> sensitive differential output caps of a ladder filter. Really loud result,
> and the whole PCB became a microphone! Took a good while before we
> understood the phenomenon. Not recommended at all. :-) C0G works fine
> though.
> 
> /mr
> Den 25 sep 2015 12:50 fm skrev "Jay Schwichtenberg" <jays at aracnet.com>:
> 
> > For non-C0G caps there are issues with microphonics. Haven't heard or read
> > anything about C0G/NP0 having issues.
> >
> >
> > https://e2e.ti.com/blogs_/b/precisionhub/archive/2014/12/19/stress-induced-o
> > utbursts-microphonics-in-ceramic-capacitors-part-1
> >
> > http://www.kemet.com/Lists/TechnicalArticles/Attachments/62/2007%20CARTS%20-
> > %20Reduced%20Microphonics%20and%20Sound%20Emissions.pdf
> >
> > http://www.kemet.com/Lists/TechnicalArticles/Attachments/45/2010-04%20CARTS%
> > 20-%20High%20Cap%20Stacked%20MLCCs%20for%20Power%20Supplies.pdf
> >
> > Jay
> >
> > -----Original Message-----
> > From: synth-diy-bounces at dropmix.xs4all.nl
> > [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Mattias
> > Rickardsson
> > Sent: Thursday, September 24, 2015 7:39 AM
> > To: synthdiy diy
> > Subject: [sdiy] C0G capacitor size differences?
> >
> > Speaking of component imperfections,
> >
> > do you know if C0G (NP0) ceramic SMT capacitors get better (more
> > ideal) with bigger sizes and/or with larger voltage ratings?
> >
> > The far less ideal X7R ceramics have a much heavier voltage variation
> > in smaller packages and in lower voltage ratings, grab a pillow and
> > see the scary graphs here:
> >
> > http://www.edn.com/design/analog/4402049/2/Temperature-and-voltage-variation
> >
> > -of-ceramic-capacitors--or-why-your-4-7--F-capacitor-becomes-a-0-33--F-capac
> > itor
> >
> > /mr
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Christian