I need to build a peak detectors for a drum pad assembly, I tried a simple diode, capacitor circuit but the diode cuts to much of the signal. The piezos are connected to a micro controller that can't exceed 3.3v. If I use an opp amp will it increase the voltage going into the board? Any advice on weather this circuit will work of if there is a better way to get the piezos to trigger faster and more accurately? I need to fit 24 of these circuits in a small area so I'd like to keep it as simple as possible.