I’ve tried some circuits to preamp a microphone and have arduino read it.
1st circuit didn’t actually read anything. Just became a sin function (even replacing the mic for a resistor).
2nd circuit had max value all the time and didn’t change its value when I talked on the microphone.
3rd circuit had value around 500 (0 min, 1023 max) and very stable. But the microphone just went up to 600 when I hit the mic against the table.
Does anybody know a good circuit that could amp the mic signal and have high amplitude and sensibility?