An electret microphone is a type of electrostatic capacitor-based microphone, which eliminates the need for a polarizing power supply by using a permanently charged material. An electret is a stable dielectric material with a permanently embedded static electric dipole moment.

What is the electret microphone used for?

Electret condenser microphones are used to convert sound into an electrical signal and are used in a wide variety of consumer electronic products, including mobile phones, GPS devices, and speech recognition equipment.

What is the difference between an electret and condenser microphone?

This week we'll conclude with condenser microphones. ... The difference between the two is that the DC-biased condenser requires an external power supply to provide polarizing voltage while the electret condenser uses a pre-polarized diaphragm or back plate. Most condenser microphones used today are electret.