These condenser microphones are widely used in electronic circuits to detect minor sounds or air vibrations which in turn are converted to electrical signals for further use. This condenser microphone has two legs which are used to make an electrical connection with the circuit. The two plates of the capacitor, which are the heart of the microphone and the diaphragm (inside the metal body) are a very thin film of conducting metal. It is deformable and elastic. The diaphragm is pasted on a solid hollow ring which provides the necessary support to the diaphragm. The back plate is a thick solid perforated metallic plate. It is coated with a permanently charged electret material to eliminate the need for a polarized power supply. These electrets are made by melting a dielectric material (like wax, plastic, etc) that contains polar molecules and solidifying them back in a strong electrostatic field. The polar molecules of the dielectric material are inclined towards the direction of the electrostatic field and create a permanent electrostatic bias in them. In the modern microphones, PTFE (Poly Tetra Fluoro Ethylene) plastic is used to form the electric material. The design of the holes plays a very vital role in reducing air damping and mechanical thermal noise. The two plates have a small gap between them to allow the movements of the diaphragm. A very fine thin film of plastic is placed between the two plates to provide electrical insulation. The diaphragm moves in the air gap between the plates with the slightest disturbance caused in the surrounding air pressure by the sound signal. If you want to use this condenser microphone in your project, you will need a few essential components like batteries and power supply, IC, and resistors.
1 X Condenser Microphone
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