Sorry, not sure why i received this letter from you.
The subject matter is interesting though.
I have found a prarie Digital A/D converter
model 40-12 connected through COM1 DB25 or DB9
connector the best way to receive seismic signals
but it requires some complex programming to
make it work.
It is not cheap also.
It would be so nice to use the sound card so long
as it will go to DC but if it does not then
you need to use frequency translation of some type
to make it work for you. Making for a more complex
and expoensive circuyit to deal with. 
It just seems best to either build your own
A/D Converter or to put oyt about $200 for one
already built that you can program yourself.

Your email came to me through the junk folder so it was
screened out as spam.

Sincerely,
gmvoeth

----- Original Message ----- 
From: "Mike Speed" 
To: "PSN Mailing List" 
Sent: Monday, July 18, 2005 11:30 AM
Subject: Modified sound card and datalogging and geophones


>I installed some larger-capacitance-value coupling
> capacitors on my 24-bit sound card so I could resolve
> lower frequencies.  What is a good datalogging app to
> use with this?
> 
> Also, I put out a request for geophones and got one
> response and never heard anything back.  I am looking
> for geophones - tell me about what you have -
> dimensions - frequency, etc., and how much you want
> for them.
> 
> Thanks,
> 
> Greg
> 
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