> What about putting an integrator after the piezo?

This works, but fyi the piezo in a sounder has very bad characteristics,
it creeps, it builds up DC potentials for no reason etc etc. I used a
section of TL074 and 1nF polypropylene feedback cap, and a switch for
reset when I tested this. The bronze backing flexes and stays flexed and
induces a lot of stress that affects the readout. Not so good.

Peter

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