The IC houses two identical integrated preamp circuits. The second preamp is used in identical manner for the second channel of the stereo microphone. Diagram bellow shows the pin numbers (in brackers ...

The surface microphone described here is a form of contact microphone ... a surface to catch vibrations from there (it takes some skill to do a good job). A circuit diagram of the proposed (tried and ...

Schematic diagram of a parabolic reflector. Incoming sound is directed to the microphone placed at the focus of the parabola-shaped reflector. The property of the parabolic shape to reflect all sound ...