Electret Microphone Circuit Capacitor

This electret has a fixed charge c and is embedded between the two electrodes.

Electret microphone circuit capacitor.

The type of electret microphone we will use is a 2 2kω electret microphone that requires only 2 2v of power. This is small and powerful for a low power supply. 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. The electret microphone operates in the range of 1 5 10v typically 2v and the current between the jfet s source drain ground output is usually max.

The electret along with the two electrodes takes the form of a sensitive variable capacitor whose outer surface responds to sound vibrations giving. The resistor and capacitor needed can easily be obtained from most electronic online retailers. The distance between the plates is directly proportional to sound present in the environment. This is a microphone that suitable for most applications including for use with a computer.

Please note that the capacitor component shown in the electret capsule schematic above is represented by the pick up plate the electret material which together create a capacitor. The electret microphone has two plates inside it just like a capacitor. A very basic circuit to get started with microphone is shown below. This is the best and interesting circuit for the beginner.

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.