hold the phone, as they say.  If the budget has suddenly gone up from $0 
then have a look at this: 
http://sine.ni.com/nips/cds/view/p/lang/en/nid/14604
This is a USB DAQ from National Instruments.  It comes with the student 
(you may need an academic address for that?) version of labview and data 
loging software...  It's around $150.

Ian


Geoff wrote:

> 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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