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An electret microphone is a type of condenser 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 charge (which, due to the high resistance and chemical stability of the material, will not decay for hundreds of years). The name comes from electrostatic and magnet; drawing analogy to the formation of a magnet by alignment of magnetic domains in a piece of iron. Electrets are commonly made by first melting a suitable dielectric material such as a plastic or wax that contains polar molecules, and then allowing it to re-solidify in a powerful electrostatic field. The polar molecules of the dielectric align themselves to the direction of the electrostatic field, producing a permanent electrostatic "bias". Modern electret microphones use PTFE plastic, either in film or solute form, to form the electret.

Today electret microphones have a market share of over 90% over all possible applications. Thanks to their small and compact form and cheap price they are the most manufactured microphones worldwide with over 2 billion units per year.

Features:

• Small scale
• High sensitivity

Pins:

• D – Drain of MOSFET
• S – Source of MOSFET

Applications:

• Microphone
• Sound detection
• Sound control device

Dimensions:

• H=6mm; Φ=10 mm