[Milsurplus] OT: Microphone Point Source

[KD7JYK DM09]

"But, I know very little about small point source microphones, if such a
thing exists."

In the late 1970's, I had taken apart several of the electret microphones.
The "microphone" component was about 1mm square, maybe smaller.  It looked
like a transistor.  It has three leads, the center, from what I recall was
soldered to a brass disk that acted as the diaphragm.

His best bet may be to search ebay for "SMD microphone".

Just did a quick search on google, found several images of SMD mics in the 
fractions of mm size, mic, amplifier, packaging, four soldering tabs, 
.3-.5mm or so.  One was shown next to a 0.1mm pen tip, it was about three 
times larger in width, about double that in length, so, it seems VERY 
possible to find what he needs.

Kurt