Audio Notch Filter

Posted in Tone control, on 2015-08-02


A variable notch filter with both high and low pass filters.

Audio Notch Filter Circuit Diagram


At first glance this circuit looks fairly complex, but when broken down,can be divided into high pass and low pass filter sections followed by a summing amplifier with a gain of around 20 times. Supply rail voltage is +/- 9V DC. The controls may also be adjusted for use as a band stop (notch) filter or band pass filter. 

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Source , Author: Andy Collinson