This page has a load of great-looking stereo/surround microphone projects, most of which are build from Panasonic WM-55A103 capsules, which cost around $2.50, and Altoids boxes. Previously: Mics made from beer cans. (via Make)
Posted by Tom Whitwell.
That looks cool, but can anyone tell me where to find plans for a easy to build directional microphone?