Amplifier

For guitar amplifier, go to Instrument amplifier

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An amplifier can be considered to be any device that uses a small amount of energy to control a larger amount, although the term today usually refers to an electronic amplifier. The relationship of the input to the output of an amplifier--usually expressed as a function of the input frequency--is called the transfer function of the amplifier, and the magnitude of the transfer function is termed the gain.

Related Topics:
Device - Electronic - Transfer function - Gain

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