Oscillator:

Oscillators changes direct current (DC) from a energy supply to an A.C. signal. They are broadly used in several electronic devices. Basic examples of signals produced by oscillators include signals transmit by television and radio transmitters, clock signals that regulate quartz clocks and computers, and the sounds generated by electronic beepers and video games.

Oscillators are usually characterized by the frequency of their output signal: An audio oscillator generates frequencies in the audio range, about 16 Hz to 20 kHz.[2]. That term is normally used in the field of audio synthesizers, to differentiate it from an audio frequency oscillator. Oscillation may be controlled, so that it takes place at a stable predictable frequency. An oscillator is a circuit network that is deliberately prepared to oscillate.

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