Path: utzoo!utgpu!water!watmath!clyde!att!pacbell!ames!netsys!vector!nobody
From: "hugh_davies.WGC1RX"@Xerox.COM
Newsgroups: comp.dcom.telecom
Subject: Re: "auditory" microphones & is this going to the correct address?
Message-ID: 
Date: 27 Sep 88 08:32:02 GMT
Sender: chip@vector.UUCP
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X-TELECOM-Digest: volume 8, issue 147, message 2
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Is this going to the right place? Last time I tried I sent it to
Telecom@XX.LCS.MIT.EDU but it got redistributed straight away rather than being
digestified????
[Yes, this is the correct address. --JSol]

In V8 #146, Phil Lapsley (phil@ucbvax.berkeley.edu) asks about "auditory"
microphones. Well, Phil, there ain't no such thing. Any electromagnetic
transducer of sound will work in either direction. The only thing that is
different is the efficiency with which it will do it. Small loudspeakers work
fairly well as loudspeakers and  microphones, and hence are referred to in that
mode as 'speaker/mikes'. If you want to buy one, go and speak to your nearest
ham radio store, as most ham 'walkie-talkies' have a speaker/mike option. If you
want to build something, try using a small speaker, say between 1" and 2"
diameter.

Hugh.