Best capacitors for sallen-key low pass filter

Thread Starter

przemmo

Joined Jan 6, 2009
8
Hello,
I'm going to design such a filter and want to ask You which capacitors are best for that. The Fc is about 2kHz. Polistyrene? Ceramic?


thx
 

beenthere

Joined Apr 20, 2004
15,808
If you need to have a close fit to the calculations, choose a film type capacitor with at least 5% tolerance - 2% is better. The greater the tolerance, the more uncertain the actual onset of the filter.
 

KL7AJ

Joined Nov 4, 2008
2,208
It's important that the capacitors have low residual inductance. Ceramics are very good in this regard, film capacitors run a close second. Avoid electrolytics at all cost.

eric
 
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