Originally Posted by lilmike
I'm no E.E. but it looks like it is "straight polarity" to me. I'll see if I can have an E.E. take a peek at what I've drawn up or take a look at phasing somehow.
Your schematic is fine but procedure
"Pin 1 of J2 is the (+) signal to the sound card (tip of the RCA or miniplug), pin 2 is the ground (ring of the RCA or miniplug)."
-> output ground is not straight connected to mics ground (1&3). I guess this could cause some problems when metal enclosure is used with grounded connectors for mic and output.
This one have it correct way.
Circuit have negative supply for mic capsule and +9V is connected to "ground" (mic capsule 1&3 pins (coaxial shield) and output ground (ring of connector). This makes mic in and signal out to have common "ground".
Correct procedure should be
Pin 2 of J2 is the (+) signal to the sound card (tip of the RCA or miniplug), pin 1 is the ground (ring of the RCA or miniplug).