Notch Filter with Both High and Low Pass Filters

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

Circuit Diagram:

 Notch Filter

Notes:
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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