Hi all,

I just finished up documenting a mechanical-analog electrical model 
for geophones.  It can be incorporated in a circuit simulation 
program such as Spice, and allows you to look at the overall system 
performance with respect to a ground velocity excitation.  It has 
been particularly useful when modeling Dave's various 
negative-resistance period-extending circuits.  There are two 
commonly used methods for creating these analogs and the one used 
here is the one in which velocity is modeled as a voltage.

It includes an Excel workbook for computing the analog equivalent 
component values from the geophone spec. sheet, and includes some examples.

http://bnordgren.org/seismo/GeophoneModel.zip


Regards,
Brett


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