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Microphone amplifier consists of LM324 and two transistors. LM324 is available in 14 pin DIP. I brought it for Rs: 6/-. It contains four identical operational amplifiers. Transistors BC548 and BC558 are used as compressor.
I used 2-wire shield wire for connecting microphone. One wire is used for condenser microphone and the other for PTT switch. Shield serves common ground to both.
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