This is a circuit for notch filter is a circuit that rejects a very narrow band of frequency. This is a passive filter. This is the figure of the circuit;
A common application of a notch filter is the removal of the 60-Hz hum from an AC line. The twin-T filter, one of the most commonly used notch filters, is a passive filter composed of two T-networks. One of these T networks has one resistor and two capacitors, while the other has two resistors and one capacitor.
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