This is an old Austrian army tank operators carbon throat microphone. It picks up the voice through the direct vibration of the vocal chords and does not feedback nearly as much as an acoustic microphone. I had to build a little circuit to make it work as carbon mics need dc power in order to work. After experimenting with a few different setups, the circuit below worked the best and the 9V should last at least 25 hours or so.
The audio transformer is about $3 at RadioShack, but does not transfer much bass as the lowend cutoff is around 300Hz … but then again, these old carbon mics do not have much bass anyway.
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This is a simple control box built out of a hacked gamepad. I simply removed the logic board from the gamepad, cut off the parts I didn’t need, and soldered new buttons to the trigger pads. The big red button lights up and is used to start/stop songs; the smaller red button loads the next song in the playlist; the black button is for Push-To-Talk voice communication control of my microphone; and the white button currently has no use. If you hold down the black and red buttons, the system will look for nearby wiimotes over Bluetooth.