I am in tight spot needing swap piezo with mic as a sensor to analog input - rather urgent.
My Piezo has been wired like this(look attached jpg). I can not build any amp for electret mic(as suggested on many discussions) right now. So I tried the amplified mic instead of the piezo into the same resistor, zener, cap configuration. It does solve my problem I had with the piezo however the sensitivity is rather poor. Should I remove resistor-zener-cap from the circuit or there is something else to be aware of(like neg V)? I could use mic through the audio mixer to get good gain though - line level.
Since I can not afford to damage the arduino (if I do something I should not to - no way I can get the replacement right now) so I ask instead.
Otherwise I shall run the show with the piezo.