Audio amplifiers-make small signal bigger!

The signal is a function that conveys information about a phenomenon. Any quantity that can vary over space or time can be used as a signal to share messages between observers. Audio amplifiers, devices that are used to increase the power, current, or voltage of a signal, are essential to any hi-fi system. They are usually used in electronic devices, such as television and radio receivers, music and audio equipment in, for example, theatrical and concert sound reinforcement systems, and domestic systems such as a stereo or home-theatre system and computers to increase the amplitude of a signal. Power amplifiers are available in standalone units, which are used by hi-fi audio enthusiasts and designers of public address systems (PA systems) and sound reinforcement systems.

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