Electret Condenser Microphone Circuit

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

Electret condenser microphone circuit. The circuit starts with the electret microphone. This electret microphone in particular needs 2 2v of power in order to operate. It is a simple clap switch circuit. Modern electret microphones use ptfe plastic either in film or solute form to form the electret.

Electret microphone uses electrostatic capacitor inside a capsule. This power is consumed by a very small preamplifier built into the microphone capsule which makes the conversion of very. 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. An electrets microphone consists of two power pins positive and ground.

It is widely used in a tape recorder phones mobiles as well as microphone based headphone bluetooth headsets. As stated the microphone needs power in order to operate. Now in input section we have used an electret microphone. This electret has a fixed charge c and is embedded between the two electrodes.

This is a one transistor fm transmitter it is a good circuit for beginners. Fm transmitter circuit 2. A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. Since the microphone port of a computer provides about 2 3v of power this will perfectly power the electret microphone.

Finally we need one more component a bypass capacitor between the emitter terminal and the ground thus c e. Typical electret condenser microphone capsule is a 2 terminal device there are also 3 pin capsules which approximates to a current source when biassed with around 1 9 volt and routinely consumes less than half a milliamp. It can be a good start for electronic beginners. This is the best and interesting circuit for the beginner.

Electret condenser microphone amplifier circuit. An electret microphone mainly consists of a diaphragm a couple of electrodes and an in built jfet. The diaphragm is made of thin teflon material and is also termed as electret and hence the name electret mic. 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.

The c1 in this circuit is the same capacitor c described in the electret microphone circuit above and its role is to cut off the dc offset of the input signal such that we work out only the ac component of the input signal. It functions exactly as opposite of a normal speaker that is when a sound signal is detected it produces electrical signals. It is composed of semiconductor material with at least three terminals for connection to an external circuit. This is small and powerful for a low power supply.