Simple Mic Pre-Amp based LM358


Here the simple audio mic pre amplifier circuit based on single IC LM358. The circuit is very simple, inexpensive and easy to built.
Simple mic pre-amp based LM358

Component Parts List:
R1, R3, R4 = 10K
R2 = 1K
R5 = 100K-1M Potensiometer
C1 = 0.1uF
C2 = 4.7uF/16V
IC1 = LM358 dual op-amp single supply
Mic = Electret Microphone

Notes:

  • Use R5 to adjust the gain of op-amp LM358.
  • The LM358 has dual op-amp module, you may build stereo audio pre-amp using single LM358.

Download LM358 datasheet here

The circuit designed by Tony van Roon

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