Variable Bandpass Audio Filter Circuit

Posted on Jan 4, 2013

This circuit is a variable audio bandpass filter that has a low cutoff variable from about 25 Hz to 700 Hz and a high cutoff variable from 2.5 kHz to over 20 kHz. Rolloff is 12 dB/octave on both high and low ends.

Variable Bandpass Audio Filter Circuit
Click here to download the full size of the above Circuit.

R2-a-b and R6-a-b are ganged potentiometers for setting lower and upper cutoff frequencies, respectively.

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in3elx   Jun 2, 2020

What loads does it work for? Small 4 OHM speakers, small 8 OHM spacker (0,5 or 1W), or even 20/40 OHM headphones?

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