Electret Microphone Circuit Design

One electrode of the capacitor is formed by a metallization layer on the charged polymer film.

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. How electret microphones work. 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. This is small and powerful for a low power supply.

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. This is another a circuit diagram of homemade mic speaker amplifier using lm386. An electret microphone mainly consists of a diaphragm a couple of electrodes and an in built jfet. 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.

A simplified circuit schematic of an electret microphone an example construction of an electret microphone is shown in figure 3. Microphone capacitor with electret jfet figure 2. The circuit starts with the electret microphone. 1k ohm 1 4w film resistor ideally a 5k variable resistor 1 pcs.

This electret microphone in particular needs 2 2v of power in order to. As stated the microphone needs power in order to operate. Electret microphone 1 pcs. Electret condenser microphone amplifier circuit.

The metallization layer on the film is. The required components are. Simple electret microphone circuit. The diaphragm is made of thin teflon material and is also termed as electret and hence the name electret mic.