audio notch filter

Posted on Aug 16, 2012

The circuit requires only one dual-ganged potentiometer to tune over a wide range; if necessary over the entire audio range in one sweep. The principle used is that of the Wien bridge, fed from anti-phase inputs. The output should be buffered as shown with a FET input op amp, particularly if a high value pot is used. An op amp with differential outputs (eg., MC1445) may be used in place of the driver ICS.

audio notch filter
Click here to download the full size of the above Circuit.

R2 may be made trimmable to optimize the notch.

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