Hi All,

In connection with creating a Spice model of Dave's 
negative-resistance geophone damper/amplifier circuit I found that I 
needed to make an electrical equivalent model of the geophone he was 
using.  In the model, the input is a voltage signal which represents 
ground motion, with 1V = 1 cm/second.  Three equivalent electrical 
components are computed, Reqv, Ceqv and Leqv, which are analogs for 
the geophone damping, mass and support-spring stiffness.  In addition 
Rc and Lc, the actual coil resistance and inductance are included in the model.

http://bnordgren.org/seismo/GeophoneModels.pdf

This model should also work with any other physical, resonant, 
velocity sensor such as many Lehmans and spring-mass verticals, if 
you wanted to experiment with modeling them as electrical circuits to 
simulate their performance.

I am using Linear Technology's free 'LTSpice' circuit simulation 
program.  It's a great system, though has taken a while to learn to 
make it work.

Regards,
Brett  


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