An operational amplifier fabricated using a 2-D semiconductor

Analog electronics are electronic systems that operate with currents and voltages that continuously change over time, rather than switching only between two levels, like digital electronics. Most existing analog devices are ...

Machine learning & AI

Deep learning can fool listeners by imitating any guitar amplifier

A study from the Aalto Acoustics Lab demonstrates that digital simulations of guitar amplifiers can sound just like the real thing. The implications are that as the software models continue to improve, they can replace traditional ...


Generally, an amplifier or simply amp, is a device for increasing the power of a signal.

In popular use, the term usually describes an electronic amplifier, in which the input "signal" is usually a voltage or a current. In audio applications, amplifiers drive the loudspeakers used in PA systems to make the human voice louder or play recorded music. Amplifiers may be classified according to the input (source) they are designed to amplify (such as a guitar amplifier, to perform with an electric guitar), the device they are intended to drive (such as a headphone amplifier), the frequency range of the signals (Audio, IF, RF, and VHF amplifiers, for example), whether they invert the signal (inverting amplifiers and non-inverting amplifiers), or the type 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.

This text uses material from Wikipedia, licensed under CC BY-SA