[sdiy] C0G capacitor size differences?

[Mattias Rickardsson]

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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