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Definition: amplifier


A device that accepts a low-power signal and outputs a high-power signal that matches the waveform of the input. Typically operating in the analog domain, amplifiers are available to boost electrical and optical signals. The heart of an amplifier is a tube or transistor. See stereo amplifier, amplifier classes, Class D amplifier and PWM.




From Low to High Current
Either a tube, widely used in high-end audio, or a transistor turns a low-power input into a high-power output.





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