Quote Originally Posted by Luciano
Hi,

Original headset:

The original headset uses an electret microphone. (Phantom powered).

* * *

Modified headset:

The circuit board is an amplifier for the dynamic microphone.
The circuit emulates an electret microphone.
The circuit is phantom powered.

Best regards,

Luciano

Correct me if I'm wrong.
Electret mike - don't need power, just am amp, like the earpiece.
Dynamic mike - Feed power to the mike on one pin, like a pre-bias voltage; connect an amp on the other pin.

I probed the connector without the headset plugged in and didn't get any power on any of the pins (well, a few mV, but it was very jumpy, so I figured it was being induced from somewhere).

How are you guessing that the original configuration might've been electret? Is that 'just the way it's always been' ?


Jeeze...this would be so much easier if I had a datasheet for the things!!!!
JDG