Microphones convert sound waves into electrical signals and are therefore used in the audio inputs of electronic devices. Microphones usually consist of a circuit containing elements such as microphone coil, magnetic coil and diac, and this circuit measures the magnetic field created by the movement of sound waves. Variations of the measured magnetic field are converted into electrical signals and these signals are processed in electronic devices.

There are several types of microphones, and these types have different features. For example, dynamic microphones measure the magnetic field created by the movement of sound waves and therefore perform according to the strength of the sound waves. Studio microphones, on the other hand, are used to record higher quality sound and are generally more expensive.

Microphones are used in a variety of electronic devices and are particularly used in audio recorders, music players, and other devices. Microphones may be more expensive than other electronic components, but they perform better at higher frequencies.