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, ring=
s
=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?
--=20
Carey Fisher
--=20
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