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  • Electric signal amplifiers designed for amplification of audio signals, typically in a range from a few hertz to 20 kHz. These amplifiers typically consist of a wide-band, high-fidelity, electronic amplifier with audio signal inputs, electronic circuits to amplify the signal (either for monophonic or stereo signals), controls (e.g., gain, frequency response), appropriate output ports for the amplified signals, and a power supply. Audio amplifiers are used mainly in hospital information and communication systems; dedicated audio amplifiers for specific signals (e.g., stethoscope sounds) and for speech amplification are also available.
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