David et al
    I did the same with a peizo with the same good result. You can slow it
way down with a home brewed sine wave oscillator. I also put it under one of
the balancing legs of a horiz seismo and was going to try it with STM's vrdt
design..
Regards
Barry

----- Original Message -----
From: "David Saum" 
To: 
Sent: Wednesday, February 13, 2002 9:46 AM
Subject: RE: homebrew shake table?


> I bought a $2 piezo speaker from RS, broke
> it apart to get the element, put it under my
> geophone, drove it with a few mv of 1 Hz
> sine wave directly from my function
> generator, and it works great!
>
> Thanks for all the suggestions,
>
> Dave



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