aheerfor@...... wrote:
> 
> >
> What sort of damping circuit should I put in front of the amplifier to
> prevent the geophone from simply oscillating?  Also, what attenuation
> <
> 
> You normally put a resistor in parallel (shunt) with the geophone. ATTN: John Larh, please read. 
Take a look at http://www.geospacecorp.com/c_hs10.htm and you will find
some charts with shunt damping results. There is an equation to set the
damping on an HS10 that Joe Sena from the USGS gave me before he
retired,  but I've lost it. Maybe John Lahr knows it.  
Regards, Steve Hammond
PSN San Jose

Actually,
> such a resistor is often installed in the geophone already.
> 
> The attenuation depends on the resistance in the coil of the geophone. If this
> for example is 100 ohm, and you put a resistor of 100 ohm in as a shunt, you
> will reduce the voltage output of teh geophone with 50%....
> 
> Regards, Anders
> 
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