Are X7R ceramic capacitors suitable as power supply bypass capacitors in audio ckts like op amp filters, or do I need to spend the much larger amount on NP0 types?
Here's a couple of links, read up and see if you think the X7Rs will do in your application.
http://en.wikipedia.org/wiki/NP0
http://en.wikipedia.org/wiki/X7R
http://en.wikipedia.org/wiki/NP0
http://en.wikipedia.org/wiki/X7R
NP0/C0G type is the better capacitor. They are more expensive and usually larger for the same value than X7R type.
TDK CAP CER 0.10UF 50V X7R 10% 0805 = $0.112
TDK CAP CER 0.10UF 50V C0G 5% 1210 = $3.30
TDK CAP CER 0.10UF 50V X7R 10% 0805 = $0.112
TDK CAP CER 0.10UF 50V C0G 5% 1210 = $3.30
X7R ceramics are fine for bypassing. NP0 would be preferred in active filter circuitry. X7R ceramics have a dielectric with a higher relative dielectric constant which equates to more capacitance per unit volume.
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