This filter allows you to remove frequency band from a signal. In the example below, we’ll design a 50Hz notch filter. This allows us to remove the 50Hz hum picked up by, say, a microphone cord. Of course, it can be easily designed for 60Hz as well.
Read more Twin T Notch Filter by TL082
circuit Transistor Hum Notch Filter
Source : Transistor Hum Notch Filter
60Hz Notch Filter by LM741
Thank Link : 60Hz Notch Filter by LM741
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