Notch Filter
Circuit :   Andy Collinson
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A variable notch filter with both high and low pass filters.

notch filter

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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