Electret Microphone Circuit Design

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 microphone circuit design.

1k ohm 1 4w film resistor ideally a 5k variable resistor 1 pcs. This electret has a fixed charge c and is embedded between the two electrodes. How electret microphones work. This electret microphone in particular needs 2 2v of power in order to.

Simple electret microphone circuit. The diaphragm is made of thin teflon material and is also termed as electret and hence the name electret mic. An electret microphone mainly consists of a diaphragm a couple of electrodes and an in built jfet. The metallization layer on the film is.

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. 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. 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.

As stated the microphone needs power in order to operate. 1uf electrolytic capacitor 1 pcs. The circuit starts with the electret microphone. This is another a circuit diagram of homemade mic speaker amplifier using lm386.

The required components are. Microphone capacitor with electret jfet figure 2. Electret condenser microphone amplifier circuit. This is the best and interesting circuit for the beginner.