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Notch Filter Circuit

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This is a design for a filter. This circuit is called as variable notch filter with both high and low pass filters. This is the figure of the circuit.


This circuit is based on LF351 for sensing the filter processing. At first glance this circuit looks fairly complex, but when broken down, it 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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