Electret Microphone Circuit Amplifier

This is another a circuit diagram of homemade mic speaker amplifier using lm386.

Electret microphone circuit amplifier. A simple pre amplifier circuit for the electret microphone. Since the microphone port of a computer provides about 2 3v of power this will perfectly power the electret microphone. This is the best and interesting circuit for the beginner. Learn more about using lm386 audio amplifier ic here.

The microphone pre amplifier circuit. Electret microphone uses electrostatic capacitor inside a capsule. Electret microphone amplifier circuit. It is composed of semiconductor material with at least three terminals for connection to an external circuit.

The metallization layer on the film is. The electret microphone pre amp scheme is very simple and based on available today components. The circuit starts with the electret microphone. A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.

One of the most common amplifier is the class a amplifier which basically uses a single transistor in common emitter configuration to produce a large output voltage from a relatively small input voltage. One electrode of the capacitor is formed by a metallization layer on the charged polymer film. As stated the microphone needs power in order to operate. Electret microphones can be inserted in the same box with the amplifier it only need 5 to 10v or 9v battery with a current consumption of just 1 5ma.

This electret microphone in particular needs 2 2v of power in order to operate. Electret condenser microphone amplifier circuit. As per the datasheet a design the 10uf capacitor is connected across these two pins and due to this the output of the amplifier is fixed to 200x. Now in input section we have used an electret microphone.

Modern electret microphones use ptfe plastic either in film or solute form to form the electret. This is small and powerful for a low power supply. Microphone capacitor with electret jfet figure 2. A simplified circuit schematic of an electret microphone an example construction of an electret microphone is shown in figure 3.