Signal amplifiers are electronic devices that can increase the power of a signal (a time-varying current or voltage) by increasing its amplitude (a measure of the change of a periodic variable over a single period).
How do signal amplifiers work?
The amount by which an amplifier increases a signals power is measured by its gain: the ratio of current, power or output voltage to input. Signal amplifiers will usually be fitted with a gain knob to adjust the signal strength as too much gain can distort the signal.
What are signal amplifiers used for?
Signal amplifiers are designed to function well in applications such as television and radio transmitters and receivers, microcomputers, high-fidelity (Hi-Fi) stereo equipment, guitars and other instrument amplifiers. Signal amplifiers will often include a transistor or electron tube to amplify output voltage.
A digital signal amplifier for antennas, for example, will help boost the signal of your antenna resulting in better reception where obstructions such as buildings or trees are hampering the signal quality.
