3 lead condenser element

[petemoore]

Got a condenser Mic element that has 3 leads
 1 shield
 2 red
 3 white
 I tried following the diagram on the back, built a little ckt. but  getting no output.
 Someone know how to wire up THis one?
 Feeling a little dohhh...need help...

[Mike Burgundy]

condenser mics need external power to work - you got the schem right for supplying power and extracting sound?
3 leads sounds like a balanced element: red will be signal+, white signal- and the sleeve is ground. Power should then be connected to the + and - leads - I *think*. There's a lot of different types on the market.
Do you have the diagram for the circuit you wired up, plus the diagram on the back of the mic for us?

[Ge_Whiz]

In my experience, three-lead electrets just have a separate wire for the inbuilt pre-amp power supply, and audio out. In two-lead elements, these have a common wire, with the DC prevented from entering the amp by an external capacitor.

I would cautiously try screen to ground, red to +1.5V DC via a 1.5k resistor, and white to amplifier via a capacitor.