Tunable notch filter to suppress hum

  
This narrow-stop-band filter can be tuned by the pot to place the notch at any frequency from 45 to 90 Hz. It attenuates power-line hum or other unwanted signals by at least 30 dB
Tunable notch filter to suppress hum - schematic

Because the circuit uses wide-tolerance parts, it is inexpensive to build.



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