"RST Engineering" wrote in message
m...
.
I've been watching this thread for some time and what is said below is
just busslit. No native electret mic that was ever made was 50 ohms, nor
are aircraft microphones 50 ohms nor are thelphone electret mikes 1k. You
are blowing smoke.

Ah yes, the qualifier "native". Now tell us the rest of the story.

Microphone: Noise-Cancelling M-7A Electret (nominal 50 ohm).
Mic Impedance: 50 ohms +/- 20%
http://www.davidclark.com/avHeadsetS...lName=H10-13.4

Here's a couple of telephone headsets with impedences listed:
TRANSMIT SPECIFICATIONS
Microphone: Noise canceling electret
Ambient noise suppression: 13db @ 1kHz, typical
Output impedance: 1.8k Ohms typical

TRANSMIT SPECIFICATIONS
Microphone: Noise canceling electret
Impedance: Low. (~300 Ohm)
http://www.vxicorp.com/support/pdf/C...coHeadsets.pdf


BTW, having been in the aircraft headset business for twenty years and
change, I can tell you that when a clown like this comes on asking where
to get a "replacement mic" without telling you the manufacturer and model
of the headset, he is trolling for ANY microphone that he can use to
convert a Harbor Freight type headset to aircraft use on the cheap.

Or a DC military headset which you can buy cheaply on ebay along with a
cheap 1 to 2 plug adapter, but they don't work worth a crap unless you swap
the mic.