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Producing hum in a microphone. LPC

Question asked by Zaid Shaikh on May 5, 2018

Hello ,
Could any one  help me in designing a ckt.
Actually i wanted to design a ckt which would block human voice from entering the microphone or in short cause a hum on the speaker from a distance of say 100 feet.
I want to send some noise wirelessly so it would produce hum in the microphone.
Any help would be appreciated.