Hello PSN;

here's my latest circuit at GVA

http://gmvoeth.home.mchsi.com/LATEST/CIRCUIT/CIRCUIT.HTML

it seems to work ok for now.

A polarity switch allows full damping or NO damping of the geophone.

It is designed only for the HS10-1 with like 440 ohms [not the Hare Krishna kind] of resistance.

comments are welcome [even if I don’t like them]

Regards,
geoff 

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