[sdiy] [SDIY] Measuring the sound levels from a microphone using an ESP32 board

[Richie Burnett]

I've had excellent results using that very circuit.

If you're running it from a single positive supply rail you need to bias the non-inverting input of the first op-amp to the same level as the incoming audio waveform. (Usually half the supply voltage.)

-Richie, 

Sent from my Xperia SP on O2

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