Malte,

It is what SPICE calls a "Voltage controlled voltage source"  I would 
describe it as a mathematically ideal amplifier, infinite input 
impedance, zero output impedance, bandwidth from DC to ?.   In the 
example it is set for a gain of 28.8 which models the geophone 
sensitivity, G, of 28.8 V / meter/second.

BTW, I just noticed in my spreadsheet that in one place I had labeled 
the units for G as V/cm/sec.  I corrected it to be V/m/sec and 
re-uploaded the zip file.  That was the only change.

Hope that helps,
Brett

At 12:52 AM 10/9/2012, you wrote:
>Hi Brett,
>
>what kind of component is the one labelled "Gv 28.8" in your SPICE model?
>
>Regards
>Malte
>
>
>Von: Brett Nordgren 
>An: psnlist 
>Gesendet: 19:41 Montag, 8.Oktober 2012
>Betreff: Geophone electrical model update
>
>Hi Chris,
>
>I just updated the file to include a diagram showing how to make a 
>Spice model having a ground-acceleration input, along with a few 
>other minor edits.
>
>http://bnordgren.org/seismo/GeophoneModel.zip
>
>Regards,
>Brett
>
>
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