here's my attempt in making one of these circuits. i've just designed it on an electronic simulation program, so i wonder if it would work with piezos, or if i can do something to properly simulate their behavior. here it is:
a brief description: - VS and RS represent the piezo - R1 and R2 set the op-amp gain (10 in this case) - R4 and C1 make a low-pass filter, that smooths the input - D1 is a BAT85 diode, and cuts out the negative parts of the signal - D2 is a 5.1V zener diode, that cut the signal at about 5V the op-amp is supplied with VE=gnd and VC=9V
to sum up, my questions are: will it work? how can i impove it? are my representation of the piezo right? what's their impedance?
thanks in advance and feel free to use it :)