10 Types of Microphones

Electret Microphone

Electret microphones are among the most widely used microphones on Earth. Because they're cheap and relatively simple, electret mics are used in cell phones, computers and hands-free headsets. An electret microphone is a type of condenser microphone in which the external charge is replaced with an electret material, which by definition is in a permanent state of electric polarization [source: BeStar Acoustic Components].