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From: "Graham Holloway"
Subject: Re: Echo sounder
Date: Tue, 21 Jan 2003 17:14:38 -0000
NNTP-Posting-Date: Tue, 21 Jan 2003 17:16:20 +0000 (UTC)
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"John Jardine" wrote in message
> Jens Rasmussen wrote in message
> > Regards
> > Jens Rasmussen
> Once bought a 15Watt boat transducer for some ground probing experiments.
> was cheap, well made and of course watertight. Just looked like a big
> plastic 'bolt'.
> As I had zilch knowledge, I simply absorbed a app' note from National Semi
> on a cheap sonar I.C they did. Don't know if they still do the chip or the
> application note but the basic info was invaluable (and no ... there is
> nothing awkward about this stuff in normal use)
It was the LM1812. 20 years ago?
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