NAD Amplifier User Guide, Owner Manual, Operating Instruction

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Generally, an amplifier or simply amp, is any device that changes, usually increases, the amplitude of a signal. The "signal" is usually voltage or current. The relationship of the input to the output of an amplifier ¡ª usually expressed as a function of the input frequency ¡ª is called the transfer function of the amplifier, and the magnitude of the transfer function is termed the gain.

In popular use, the term usually refers to an electronic amplifier, often as in audio applications to operate a loudspeaker that is being used in a PA system to make the human voice louder or play recorded music. Amplifiers may be classified by the input (source) they are designed to amplify (such as a guitar amplifier to perform with an electric guitar), or named for the device they are intended to drive (such as a headphone amplifier), or by the frequency range of the signals (Audio, IF, RF and VHF amplifiers for example), or grouped by whether they invert the signal (inverting amplifiers and non-inverting amplifiers, or by the types of device used in the amplification (valve or tube amplifiers, FET amplifiers, etc.).

A related device that emphasizes conversion of signals of one type to another (for example, a light signal in photons to a DC signal in amperes) is a transducer, a transformer, or a sensor. However, none of these amplify power.

Amplifiers included distribution amplifier, low noise amplifier, power amplifier, operational amplifier, lownoise amplifier, high power amplifier, voltage controlled amplifier, differential amplifier, pre amplifier and optical fiber amplifier.

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