An amplifier, or electronic amplifier, is an electronic device that increases the magnitude of a signal. It is a two-port circuit that draws electric power from a power supply to raise the amplitude of a signal applied to its input, producing a proportionally larger signal at its output. The amount of amplification an amplifier provides is measured by its gain, the ratio of output voltage, current, or power to input, and by definition an amplifier is a circuit whose power gain is greater than one. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
SignificanceAmplification became fundamental to nearly all subsequent electronics, letting a weak signal from a microphone, antenna or sensor be strengthened enough to drive a speaker, transmitter or display. 1 Connections
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Source Amplifier (Wikipedia)
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Source Amplifier (Wikipedia)
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1. Amplifier (Wikipedia)
Wikimedia FoundationHistory section, Vacuum tubes subsection, triode invention sentence
The first practical electrical device which could amplify was the triode vacuum tube, invented in 1906 by Lee de Forest, which led to the first amplifiers around 1912.
Lead paragraph, amplification-is-fundamental sentence
Amplification is fundamental to modern electronics, and amplifiers are widely used in almost all electronic equipment.
In Field: Electrical Engineering, Categories
Electronic amplifiers
Invented By: Lee de Forest, Article body
The first practical electrical device which could amplify was the triode vacuum tube, invented in 1906 by Lee de Forest, which led to the first amplifiers around 1912.
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