What is a custom buffer? Is it really necessary? By a A/D voltmeter I gather you mean one of the voltmeters that produces a graph so I can read off the "big" peak and get the voltage. Is making the custom buffer hard?
I mean a amplifier that has such a high input impedance (like 1000 Megs) that it will not contribute to the leakage of charge from the capacitor. The input of a typical A/D may not be good enough in that regard.
Actually, I meant a plug-in board on a PC that makes it possible for software to capture the voltage.
No, a single-stage op-amp will do, if the op-amp is selected for ultra-low input bias current, like most FET-input op-amps.
I don't know if his timer will start/stop in response to bounce - I view it (a la your elegant R/C solution) that total collision time is literally when the contacts are touching, so that the periods when they do not touch due to bouncing during the colision event should not be counted.
If he *must* use that specific timer, is there a better way?
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