Amplifier

Amplifier An electronic device that increases the strength of a signal input, drawing the necessary power from a source other than the signal itself. The signal may be received from a tuner (in a radio), a cartridge (in a phonograph), a tape deck, a microphone, a digital source, or a preamplifier. Signal strength may be increased hundreds or even thousands of times. Since a standard audio amplifier provides the necessary power to operate the loudspeaker, it is also called a power amplifier…