This device is a stereo amplifier for a high sensitivity stereo parabolic microphone. It can be used for listening to distant sounds. This unit has a stereo audio path that helps produce more realistic sounding audio.
http://www.solorb.com/elect/misc/bige/
This mic uses two Panasonic WM-55A103 cardioid electret capsules whose outputs are combined to form a figure eight mic for the side output.
http://www.mp3forkidz.com/mic/msmicV2.html
Project idea for constructing an inductive pickup. In effect this a direct-injection device that can be positioned like a microphone. Useful for recording the electromagnetic output from loudspeakers or their associated cables.
http://free.prohosting.com/~pointsrc/audio/induct.html
http://www.ethanwiner.com/U47-FET.html
http://www.elektroindonesia.com/elektro/el0101a.html
http://sound.westhost.com/project25.htm
Bill's Electronics Reference Library - A collection of advice, techniques, suggestions, sources, and project ideas for the electronics hobbyist
http://www.reprise.com/host/circuits/riaa_preamp.asp
Design idea for making your own very small microphone to youse with MD recorder
http://www.atempo.dk/mic/