PSN-L Email List Message

Subject: Re: Homade Geophone
From: "Geoff" gmvoeth@...........
Date: Mon, 8 Aug 2005 19:42:58 -0700


The Piezo Idea is very interesting

Have you ever heard of a strain guage approach where
you just hang a 10# or so weight from a strainguage
and measure the tiny weight changes due to ground acceleration ??

It sounds a lot like the piezo idea but a strain guage would
be resistive in nature I believe.

At the moment I am using the top 9 bits of a 12 bit A/D converter
looking at a +/- 2.048 voltage swing through amplifier filter with
a gain of about 90DB will that same setup work with the piezo
element ?
Do I need a special preamp for the piezo element ?



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