Jim Brown wrote:
On Fri, 15 Aug 2008 08:04:31 +0100, David Woolley (E.L) wrote:
Condenser microphones, that were historically used as broadcast
microphones,
Condenser mics have historically been used for MUSIC, both
recording and broadcast (and they still are). Most broadcasters use
Thanks for the clarification; my memory was a bit shaky on the exact
scope of use.
Electret condenser mics need a different form of bias. The capsule
(the transducer) is permanantly biased when it is manufactured --
it doesn't need anything from the circuitry. The very small signal
produced by the capsule is amplified, usually by a FET follower
circuit. This amplifier circuit is what needs DC voltage and
current from the radio.
I'm not clear how this differs from what I said. The FET follower is
the pre-amplifier that I was talking about.
--
David Woolley
"The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general topics related ham radio"
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