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From: charlie@oakhill.UUCP (Charlie Thompson)
Newsgroups: sci.electronics,rec.ham-radio
Subject: ultrasonic mics/transducers
Keywords: ultrasonic
Message-ID: <1989@otis.oakhill.UUCP>
Date: 21 Apr 89 05:19:39 GMT
Organization: Motorola Inc. Austin, Tx
Lines: 11

I am looking for something to use as an ultrsonic microphone.
I have a little 25KHz ultrsonic transducer but it is resonant
at 25KHz and offers a very narrow bandwidth around 25.  I'd like
to have something with a broader response.  I tested a cheapie
condenser mic and it seems to work at 25K pretty well.  The
intended application is a tuneable untrasonic receiver of the
heterodyne/homodyne variety and hence the need for broad-bandedness.
Coverage up to 40KHz is desireable.

Charlie Thompson WB4HVD
Austin,TX