Hi Bob,

He says sure, as soon as the circuit stops changing.  We're still 
fine-tuning the design now that we have the Spice model.  There are a 
few modest bumps predicted and observed in the frequency-response at 
250Hz and above that we'd like to make go away and we are also 
looking at the effect of the inductance of the geophone coil.

One of these days we hope to understand its subtleties well enough to 
be able to explain it.

Brett

At 07:23 PM 9/21/2012, you wrote:


>Very nice!  I have an inverse filter setup using a 10Hz phone and
>results are not great.  I have been meaning to try the Lippmann approach
>for some time - maybe now is the time!
>
>Is Dave Nelson willing to share his circuit?
>
>Thanks,
>
>--
>Bob Smither                                 bob@...........


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