Lm358 Mic Amplifier Circuit Diagram. You can use power supply less than 9v i would expect it to work fine no need to change any resistors or capacitors value but capacitors should be bit higher than 9v. The circuit is very simple inexpensive and easy to built.

The circuit is very simple inexpensive and easy to built. Lm358 microphone amplifier direct connection of the microphones does not give the power audio signals. Here the simple mic pre amp circuit design based on single ic lm358.

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.

This is a simple lm358 microphone preamplifier schematic diagram. You can use power supply less than 9v i would expect it to work fine no need to change any resistors or capacitors value but capacitors should be bit higher than 9v. This mic pre amplifier circuit operated with 9v dc voltage you may use 9v battery for this circuit. 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.