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Re: how best to connect a hydrophone to a laptop?

Subject: Re: how best to connect a hydrophone to a laptop?
From: Anders Heerfordt <>
Date: Tue, 30 Dec 2003 12:58:50 -0800
I want an inexpensive way to connect a hydrophone to a
 card. I will then write the software to read the
 audio-in port. I want to read frequencies between 1 Hz
 and 100 kHz and use my own software to read the input
 Does this make sense?
 No, it doesn't make sense.
 The ordinary built-in soundcard in a laptop is low quality and doesn't have a
 frequency range like the one you mention.
 Neither will the signal/noise level make you happy.
 There will be a kind of impedance mismatch between the hydrophone and the
 microphone preamplifier, which will degrade the S/N further.
 If you can accept a flat frequency range 20 Hz - 40 kHz, and can accept to
 use a mic preamp instead of a real hydrophone preamp, you might find Core
 Sound's Mic2496 interesting.  (From the sales blurb: Mic2496 is a handheld
 24-bit/96 KS/s dual mic pre-amp and A-to-D converter that runs on a single
 9 Volt battery, provides 48 Volt phantom power and offers very fine sound
 and very low noise. It's a great front end for our PDAudio high resolution
 recording system. We're proud to say that there's nothing else like it in
 the world! It's available now for $499! )  The web-site is
 Anders Heerfordt
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