This mic uses two Panasonic WM-55A103 cardioid electret capsules whose outputs are combined to form a figure eight mic for the side output, and a front-firing electret for the mid output. It has a stereo matrixing cicuit with adjustable width and a built-in preamp with adjustable gain providing a line level unbalanced output.
http://www.mp3forkidz.com/mic/index.html
http://www.paia.com/msmicsch.gif
The circuit is a simple one transistor amplifier with amplification of about 30-40 dB (depends on transitor, temperature and voltage). The dynamic mic input is just a simple one transistor amplifier circuit with nothing special.
http://www.ee.washington.edu/circuit_archive/circuits/micamp.html
Information with circuit diagram.
http://www.xprt.net/~rcrowley/SonyC37/index.htm
http://library.thinkquest.org/16497/gather/cgi-bin/projects/4.gif
So, without further ado, here is another FM Wireless Microphone with added microphone amplifier and power amplifier stage to increase the microphone sensitivity and range. Please note that this circuit is drawn from memory and I cannot guarantee that it will work well without some form of modification so please treat this project only as an idea.
http://w1.859.telia.com/~u85920178/tx/bug2.htm
Here is the super NEW miracle improved "Frequency Modulation Wireless Microphone" (BUG) with added easablilty, readability and copyability. This was necessitated after the number of E-Mail questions posed by people who were confused by the layout of the project(s). Before proceeding with the interesting bits, please note:
http://w1.859.telia.com/~u85920178/tx/bug.htm
Uses Opamp Labs module 425
http://www.opamplabs.com/disp.htm
perfect solution to getting a signal off of your old turntable and into your mixing board.
http://www.paia.com/riaa.asp
Amplification 35 dB, flat frequency response from 20 Hz to 20 kHz
http://www.tkk.fi/Misc/Electronics/circuits/micamp.html