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From: ee5391aa@hydra.unm.edu (Duke McMullan n5gax)
Newsgroups: sci.electronics
Subject: Re: electronics fog horn
Message-ID: <1990Jul18.172626.29473@ariel.unm.edu>
Date: 18 Jul 90 17:26:26 GMT
References: <1990Jul16.220245.6545@mtcchi.uucp>
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In article <1990Jul16.220245.6545@mtcchi.uucp> cas@mtcchi.uucp
(2668-Charles A Sherwood(Z550900)0000) writes:
>My brother is interested in a fog horn for his boat.
>Does anyone have a circuit that produces a fog horn like sound??
>How about an idea as what frequencies a fog horn puts out?

Chuck, the frequency characteristic of the sound isn't the big thing: power is.

IMHO, if you want a REAL loud sound, get a gas- or air-powered horn. Which
you want depends on your bank account and "environmental consciousness".

Unless I've missed a bet somewhere, an electronic foghorn of equivalent power
to an acoustical horn is gonna cost huge bucks.

Not ten feet from me is a little freon-driven hand-held horn I picked up for a
few bucks at Wal-mart. It'll pin your ears together. It has some drawbacks,
too -- get water in it, and it's likely to freeze up when you use it from the
heat soaked up by the vaporizing freon. (I discovered this while blatting it
underwater on Glendo Reservoir in Wyoming. Hey, I had to have SOMETHING to do
while sitting in that dumb raft!)

You can get electrically-driven (12v) compressor/reservoir/airhorn combos
that may be what you want. They're electrically activated, too. A friend put
one in his little Nipponese car about ten years back. Scared the feces out
of me.... I don't recall the supplier...J.C. Whitney it may have been.


						BEEEEEEEP!,
						     d


--
			"Peace is hell." -- Skyler
   Duke McMullan n5gax nss13429r phon505-255-4642 ee5391aa@hydra.unm.edu