Amplifiers is an electronic device or circuit component, which is composed of electronic tubes, transistors, integrated circuits and other components, its core function is to amplify the input weak signal to drive other devices or to achieve long-distance transmission of strong signals. By using energy (usually supplied by a power supply), amplifiers are able to boost weak electrical signals to a level sufficient to drive the load. The role of the amplifier is to compensate for the attenuation of the signal during transmission, improve the signal-to-noise ratio of the signal, so that the signal can be transmitted over a longer distance and maintain clarity.

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