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Simple Preamp Mic using IC LM358

SimpleSimpleSimple Preamp Mic using IC LM358

This circuit is a simple audio microphone preamp based on a single IC LM358. The circuit is very simple, cheap and easy to build.

Note:
  • variable resistor of R5 to adjust the gain of op-amplifier IC LM358.
  • The LM358 has two op-amp module, you may build stereo audio pre-amplifier using single LM358.

Component list of simple preamp mic circuit:
R1, R3, R4 : 10K
R2 : 1K
R5 : 100K-1M Potensiometer
C1 : 0.1uF
C2 : 4.7uF/16V
IC1 : LM358 dual op-amplifier
Mic : Electret Microphone
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