<p dir="ltr">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.</p>
<p dir="ltr">/mr<br>
</p>
<div class="gmail_quote">Den 25 sep 2015 12:50 fm skrev "Jay Schwichtenberg" <<a href="mailto:jays@aracnet.com">jays@aracnet.com</a>>:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">For non-C0G caps there are issues with microphonics. Haven't heard or read<br>
anything about C0G/NP0 having issues.<br>
<br>
<a href="https://e2e.ti.com/blogs_/b/precisionhub/archive/2014/12/19/stress-induced-o
utbursts-microphonics-in-ceramic-capacitors-part-1" rel="noreferrer" target="_blank">https://e2e.ti.com/blogs_/b/precisionhub/archive/2014/12/19/stress-induced-o<br>
utbursts-microphonics-in-ceramic-capacitors-part-1</a><br>
<a href="http://www.kemet.com/Lists/TechnicalArticles/Attachments/62/2007%20CARTS%20-
%20Reduced%20Microphonics%20and%20Sound%20Emissions.pdf" rel="noreferrer" target="_blank">http://www.kemet.com/Lists/TechnicalArticles/Attachments/62/2007%20CARTS%20-<br>
%20Reduced%20Microphonics%20and%20Sound%20Emissions.pdf</a><br>
<a href="http://www.kemet.com/Lists/TechnicalArticles/Attachments/45/2010-04%20CARTS%
20-%20High%20Cap%20Stacked%20MLCCs%20for%20Power%20Supplies.pdf" rel="noreferrer" target="_blank">http://www.kemet.com/Lists/TechnicalArticles/Attachments/45/2010-04%20CARTS%<br>
20-%20High%20Cap%20Stacked%20MLCCs%20for%20Power%20Supplies.pdf</a><br>
<br>
Jay<br>
<br>
-----Original Message-----<br>
From: <a href="mailto:synth-diy-bounces@dropmix.xs4all.nl">synth-diy-bounces@dropmix.xs4all.nl</a><br>
[mailto:<a href="mailto:synth-diy-bounces@dropmix.xs4all.nl">synth-diy-bounces@dropmix.xs4all.nl</a>] On Behalf Of Mattias<br>
Rickardsson<br>
Sent: Thursday, September 24, 2015 7:39 AM<br>
To: synthdiy diy<br>
Subject: [sdiy] C0G capacitor size differences?<br>
<br>
Speaking of component imperfections,<br>
<br>
do you know if C0G (NP0) ceramic SMT capacitors get better (more<br>
ideal) with bigger sizes and/or with larger voltage ratings?<br>
<br>
The far less ideal X7R ceramics have a much heavier voltage variation<br>
in smaller packages and in lower voltage ratings, grab a pillow and<br>
see the scary graphs here:<br>
<a href="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" rel="noreferrer" target="_blank">http://www.edn.com/design/analog/4402049/2/Temperature-and-voltage-variation<br>
-of-ceramic-capacitors--or-why-your-4-7--F-capacitor-becomes-a-0-33--F-capac</a><br>
itor<br>
<br>
/mr<br>
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</blockquote></div>