Ed,

Sound cards are designed for the human ear so most of them do not have =
the low frequency response needed to record earthquakes. You need an A/D =
board that has a DC path to the A/D chip. Also, stay away from 8 bit A/D =
boards. They just don't have the dynamic range need to record =
earthquakes. See this page for more info =
http://www.seismicnet.com/dynamic.txt.

Regards,
Larry Cochrane
Redwood City, PSN
  ----- Original Message -----=20
  From: Ed Ianni=20
  To: psn-l@.................
  Sent: Thursday, August 29, 2002 5:26 PM
  Subject: Re: Seismograph






         I am interested in taking my homemade Lehman Seismograph and =
feeding it into my computer to look at the data online and to store it =
for later review. I am looking for a simple system to do this. Can you =
guide me a little bit? Can I use my sound card as an AD converter? Is =
there a simple program on the web that well let me see it ONLINE and =
also STORE it? Thanks a lot. Ed.  =20







Ed,
 
Sound cards are designed for the human =
ear=20
so most of them do not have the low frequency response =
needed to=20
record earthquakes. You need an A/D board that has a DC path to the =
A/D=20
chip. Also, stay away from 8 bit A/D boards. They just don't have the =
dynamic=20
range need to record earthquakes. See this page for more info http://www.seismicnet.com/=
dynamic.txt.
 
Regards,
Larry Cochrane
Redwood City, PSN

  
----- Original Message ----- 
  From:=20
  Ed =
Ianni=20
  
  
To: psn-l@.............. 
  
Sent: Thursday, August 29, 2002 =
5:26=20
  PM
  
Subject: Re: Seismograph
  


  
 
  

    
 
    


    
     I am =
interested in=20
    taking my homemade Lehman Seismograph and feeding it into my =
computer to=20
    look at the data online and to store it for later review. =
I am=20
    looking for a simple system to do this. Can you guide me a little =
bit? Can I=20
    use my sound card as an AD converter? Is there a simple program =
on the=20
    web that well let me see it ONLINE and also STORE it? Thanks a lot.=20
    =
Ed.