posted on Apr, 25 2008 @ 11:08 PM
A piezoelectric crystal doesn't actually produce very much current, and I doubt you could apply enough strain to the crystal to produce anything that
you could feel. Depending on what frequency the crystal is, you could have heard something like you describe.
I took a few minutes after writing the above to take a quick look at the equations on wikipedia, and depending on the size of the crystal, you could
definitely have heard it oscillate, though I never thought about that aspect of it before.
I've never actually played with the crystals themselves, but I have used oscillators which contain those crystals somewhere inside them. I suppose
you could borrow a voltmeter and place each of the leads on the crystal ends and see if you got a voltage or not. If you got zero volts, then your
crystal doesn't work. (or the leads are in the wrong place!
) I'm not sure what a typical reading would be on one of those crystals for
voltage, though. The oscillators I used had external power applied to them, and then they turned a DC current into an AC one by giving it the
frequency of the crystal, and if I remember right, they were something like 400 kHz, which is out of hearing range.
Again, I don't really know how much current/voltage one of those crystals would produce, but if it's enough, you could just take a wire and connect
it to both ends of the crystal. Have you ever done that with a 1.5 volt battery? The wire will get hot really fast, and you probably won't be able
to hold it there for long, unless it is insulated. That would cost nothing in equipment to test, but it might not work if the crystal is too weak to
heat up the wire noticeably.