Electret Condenser Microphones 9mm SMD SMT Type Multipurpose Microphone Mini MIC For AHD and IP Camera. (MOQ-1000)

Description:

• Electret Condenser Microphones 9mm SMD SMT Type Multipurpose Microphone Mini MIC Cartridge 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 (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 moleciles , 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.
• Cylinder shaped, it is a converted the voice signal to electrical signals energy conversion device.
•  It is back electret type, with high resistance to vibrations, high signal to noise ratio.
• Widely used in the cassette recorder, wireless microphone and voice control circuits.