One could build such a thing with a piezo disk from a discarded buzzer. I
built a velocity feedback subwoofer with one of those glued to the speaker
cone. They are relatively flat to an octave below resonant frequency. Use
it in the voltage mode into an op-amp, then take a reading from the output
to a RMS AC voltmeter, preferably with dB function. There might even be
enough sensitivity to read directly from a voltmeter without intermediate
gain. 

I'm not sure how you'd calibrate it, though. Mine was calibrated against a
Sensym accelerometer.

Michael

 

At 12:02 PM 12/15/99 -0700, you wrote:
>
>Hi All,
>   A fellow is looking for a cheap accelerometer; the type that simply give
>you a digital readout or something of the magnitude of acceleration...anyone
>know of a good source that I can pass on?
>
>John Hernlund
>E-mail: hernlund@.......
>WWW: http://www.public.asu.edu/~hernlund/


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