"hugh_davies.WGC1RX"@Xerox.COM (09/27/88)
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.
dhsu@Sun.COM (David Hsu) (09/30/88)
>In V8 #146, Phil Lapsley (phil@ucbvax.berkeley.edu) asks about "auditory" >microphones. Well, Phil, there ain't no such thing. > >Hugh. I beg to differ. Earmikes are gaining popularity again in applications where a boom would be inconvenient, and in noisy environments. If Phil is reduced to cannibalizing something like the Radio Shack unit he mentions, I would suggest contacting a motorcycle discussion like rec.motorcycles; they periodically discuss helmet communicators (like the Maxon), places to shop, and prices, some of which I'm certain are less than $80. -dave -- David Hsu dhsu@sun.com <standard disclaimer> "Rock rock, rock'n roll high school"