At 09:48 PM 6/24/01 -0400, you wrote:
>You should be unable to find any sensor in this physical universe which
>will produce a voltage with unchanging prolonged pressure.  If you found
>one, then I would take a few million of them, build my house on top and
>power the house with this 'infinite' power supply.

If you give up on the self-powered part, load cells work nicely.

If the force has a time element, either a piezo-electric sensor or a
geophone-type sensor (motion of metal within magnetic field, etc.) can be
used. Both could be made to generate a voltage waveform from an impact or
oscillatory force.


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Robert A. LaBudde, PhD, PAS, Dpl. ACAFS  e-mail: ral@lcfltd.com
Least Cost Formulations, Ltd.            URL: http://lcfltd.com/
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Virginia Beach, VA 23464-3239            Fax: 757-467-2947

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