Article View: sci.electronics
Article #21219Re: ultrasonic mics/transducers
From: Ben Thornton
Date: Tue, 25 Apr 1989 15:40
Date: Tue, 25 Apr 1989 15:40
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In article <1989@otis.oakhill.UUCP> charlie@oakhill.UUCP (Charlie Thompson) writes: >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. Hmmm... how about one of those cheap electret pellet microphones? These are the kind that are built into small cassette tape recorders and hand-picked ones are used as the element in a PZM. They are normally bandwidth-limited by the circuit they are used in, but I think they will actually respond well into the ultrasonic range. . . . . . . . -- Ben Thornton packet: WD5HLS @ KB5PM Video Associates Labs uucp: ...!cs.utexas.edu!oakhill!val!ben Austin, TX fidonet: 1:382/40 - The Antenna Farm BBS
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!oakhill!val!ben From: ben@val.UUCP (Ben Thornton) Newsgroups: sci.electronics,rec.ham-radio Subject: Re: ultrasonic mics/transducers Keywords: ultrasonic microphones Message-ID: <328@val.UUCP> Date: 25 Apr 89 15:40:13 GMT References: <1989@otis.oakhill.UUCP> Reply-To: ben@val.UUCP (Ben Thornton) Organization: Video Associates Labs - Austin, TX Lines: 28