At 08:08 AM 9/23/97 +0100, you wrote:
>I just put my 'scope across a piezo sounder, and found that I could get
>several volts out of it when I tapped it, with it resting on a hard
>surface. A 1n ceramic capacitor just produced a few mV, I couldn't
>measure it, but something was there, because it was triggering the
>'scope.

Drop a small ball bearing or what we call a 'BB' into the sounder opening,
tape the opening and you get a motion detector.


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