lm387 dynamic microphone preamplifier

  
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A dynamic microphone preamplifier can be realized using LM387 dual operational amplifier integrated circuit. Input impedance corresponds to 47k, it depends almost exclusively by R1. If you wish to connect a dynamic microphone with a different value, the resistance R1 can be changed. Dynamic microphone preamplifier amplification was set at 40dB. In
lm387 dynamic microphone preamplifier - schematic

put impedance of the amplifier where it will connect the preamplifier must be at least 100k.



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