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From: jeffr@sri-spam.istc.sri.com (Jeff Rininger)
Newsgroups: sci.electronics
Subject: Re: Waterproof Transducers/speakers
Message-ID: <9823@sri-spam.istc.sri.com>
Date: Thu, 15-Jan-87 11:00:38 EST
Article-I.D.: sri-spam.9823
Posted: Thu Jan 15 11:00:38 1987
Date-Received: Fri, 16-Jan-87 01:19:04 EST
References: <172@ndmath.UUCP>
Reply-To: jeffr@sri-spam.arpa (Jeff Rininger)
Organization: SRI International, Menlo Park
Lines: 11
Keywords: waterproof, ultrasonic, speaker, transducer, microphone
Summary: Piezo tweeter might work

In article <172@ndmath.UUCP> milo@ndmath.UUCP (Greg Corson) writes:
>Does anyone have any idea where I might be able to get a waterproof ultrasonic
>transducer?  [. . .]

	Greg, this is total speculation, but a piezo tweeter (Motorola
	makes one) might do the trick.  I know they work to at least
	40 kHz, and I used one outside in my garden (ultrasonic bug
	repellent experiments) for a year or so.  It seems to have
	survived the rainy season, so perhaps it is waterproof.  The
	cost is low (about $5.00) to be worth a try, anyway ! Good
	luck !