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 Lines: 16 Approved: telecom-request@vector.uucp (USENET Telecom Moderator) X-TELECOM-Digest: volume 8, issue 147, message 2 X-Submissions-To: telecom@xx.lcs.mit.edu (Mailing List Coordinator) X-Administrivia-To: telecom-request@vector.uucp (USENET Telecom Moderator) 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.