Electret Microphone Circuit Design

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.

Electret microphone circuit design.

The diaphragm is made of thin teflon material and is also termed as electret and hence the name electret mic. 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. Electret condenser microphone amplifier circuit. Electret microphone 1 pcs.

An electret microphone mainly consists of a diaphragm a couple of electrodes and an in built jfet. This is the best and interesting circuit for the beginner. Next we are going to create a small test circuit that will help us to test the electret microphone with the aid of a computer. One electrode of the capacitor is formed by a metallization layer on the charged polymer film.

1uf electrolytic capacitor 1 pcs. This electret has a fixed charge c and is embedded between the two electrodes. The circuit starts with the electret microphone. A simplified circuit schematic of an electret microphone an example construction of an electret microphone is shown in figure 3.

Now that we know all the components we are going to use we will go over the circuit schematic for the electret microphone shown below. Simple electret microphone circuit. This is another a circuit diagram of homemade mic speaker amplifier using lm386. This is small and powerful for a low power supply.

The metallization layer on the film is. Microphone capacitor with electret jfet figure 2. The required components are. This electret microphone in particular needs 2 2v of power in order to.