Larry,

Actually it's Dave Nelson's (CA) invention.  Really cute with rather 
surprisingly good performance.

Details at:  http://bnordgren.org/seismo/FMES.zip

I think there are a number of these in kit form with finished circuit 
boards that he's had around for a while.

Brett


At 09:40 AM 7/31/2011, you wrote:
>Brett,
>
>Boy, I'd like to see what you have inside of those little blue 
>boxes, and I bet I'm not the only one.  Do you have more information 
>on this design?
>
>Larry
>
>
>On 7/31/2011 12:40 AM, Brett Nordgren wrote:
>>Dave,
>>
>>Just for laughs, here's the other end of the specturm in regards to mass.
>>
>>They use an effective mass of 19 grams, and don't do badly at all.
>>Design by the 'other' Dave Nelson.
>>
>>http://bnordgren.org/seismo/gif_images2.htm
>>
>>Brett


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