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An '''amplifier''' is an electrical device which takes a small signal input and generates a large signal output that is reasonably faithful to the input.
Typically, the input signal will be from a low voltage, high impedance source, and the amplifier output will be high voltage and low impedance (especially when being used in an audio processing setup).
Many specialized amplifiers are used for various tasks, for instance, taking the signal from the final compressor in the signal chain at a radio station control room and boosting it to be fed to the broadcasting [[antenna]]. Such amplifiers have output impedances that are [[impedance matching|carefully tuned]] to the antenna's characteristics to ensure maximum power transfer.
An amplifier circuit is used in [[microwave oven]]s to produce the high power electromagnetic waves that do the actual cooking.
Amplifiers can be built using [[vacuum tube]]s or [[transistor]]s, or a combination of both.
[[category:electronics]]
Typically, the input signal will be from a low voltage, high impedance source, and the amplifier output will be high voltage and low impedance (especially when being used in an audio processing setup).
Many specialized amplifiers are used for various tasks, for instance, taking the signal from the final compressor in the signal chain at a radio station control room and boosting it to be fed to the broadcasting [[antenna]]. Such amplifiers have output impedances that are [[impedance matching|carefully tuned]] to the antenna's characteristics to ensure maximum power transfer.
An amplifier circuit is used in [[microwave oven]]s to produce the high power electromagnetic waves that do the actual cooking.
Amplifiers can be built using [[vacuum tube]]s or [[transistor]]s, or a combination of both.
[[category:electronics]]