diaphragm

The motor vibrates a diaphragm that in turn vibrates the air in immediate contact with it, producing a sound wave corresponding to the pattern of the original speech or music signal. Most frequently the motor consists of a coil of wire moving in a strong magnetic field, but the…

…a slightly flexible surface (diaphragm), causing it to move to and fro in a manner corresponding to the movement of the air particles. In the second, the diaphragm by its motion causes a corresponding change in some property of an electric circuit. Depending on the type of microphone, displacement…

…microphone is constructed with the diaphragm as one plate of a parallel-plate capacitor. The most popular form of this type of microphone is the electret condenser microphone, in which the plates are given a permanent electrical charge. When a sound wave causes the charged diaphragm plate to vibrate, the voltage…