Electret Microphone and Phototransistors
Montaigne, Mike - NRC email (remove spam text)
Two terminals, one is common - usually hooked to case
They all have an internal FET that needs some power.
Digikey has a bunch of electret mikes - around $5 each and you can also get
some different ones at Radio Shack on the parts wall, and they even come
with a schematic.
Feed usually +1 to +5 volts to hot terminal through load resistor 2K to 10K
and take off single ended signal at hot signal through cap to get rid of the
http://www.piclist.com hint: The PICList is archived three different
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See also: www.piclist.com/techref/io/audio.htm?key=microphone
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