Amplifier

thumb|right|A McIntosh stereo audio amplifier with output power of 50 watts per channel used in home component audio systems in the 1970s An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current). It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude (magnitude of the voltage or current) of a signal applied to its input terminals, producing a proportionally greater amplitude signal at its output. The amount of amplification provided by an amplifier is measured by its gain: the ratio of output voltage, current, or power to input. An amplifier is defined as a circuit that has a power gain greater than one. Quotes about amplifiers It takes a special sort of engineer to build a great guitar amplifier. They must have a sure scientific knowledge of circuit design - but also a great set of ears and a certain gut feel for what will sound great. And, as if that isn’t enough, they need to be gigging guitarists, too, so they understand what players want from amps and pedals and how they can build pro-grade amps to survive the road. MusicRadar External links Category:Technology