Hum Remover circuit diagram

“Hum” usually occured from liveaudiosystem, for example: input from microphone. Hum can be removed from an audio signal to get the maximum performance by mixing the actual hum with an antiphase hum in equal level. You can use any NPN transistor to support thiscircuit.
VR1 adjusted with VR2 until the hum is at minimum. SW1 may have to be changed over, then adjust VR2, is altered until the hum is removed.
Block diagram:

 

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