At 03:33 PM 11/28/2011, Carey Fisher wrote:
>Can anyone tell me how to interface to the microphone of a Plantronics
>Headset that uses the dual, 3 circuit, WECO-type plug (it looks like two
>stereo plugs in one shell).  I know the pinouts: Sleeves =3D earpiece, rin=
gs
>=3D PTT and tips =3D microphone. PTT and earpiece are working but I haven'=
t
>been able to get mic audio from the headset.  I've tried the typical
>Electret circuit (5VDC through a 2k2 resistor) but no audio.  Any chance
>the mic is a dynamic mic?

The mic is most likely an electret.  Pretty much every Plantronics=20
headset that I've touched over the past many years has used electret mics.

Question: did you try swapping the polarity of the mic connections?

dwayne

--=20
Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
www.trinity-electronics.com
Custom Electronics Design and Manufacturing

--=20
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