08-09-2017, 11:53 AM
An audio power amplifier (or power amplifier) is an electronic amplifier that reinforces low-power and inaudible electronic audio signals, such as the radio receiver signal or the electric guitar pickup, to a level strong enough to drive (or power) speakers or headphones. This includes amplifiers used in home audio systems and amplifiers of musical instruments like guitar amplifiers. Power amplifiers make the signal - whether it's recorded music, a live speech, live singing, an electric guitar or the blended audio of a whole band through a sound reinforcement-audible system for the listeners. It is the final electronic stage in a typical audio playback string before the signal is sent to the speakers and the speakers' enclosures.
The above steps in such a chain are low power audio amplifiers performing tasks such as signal pre-amplification (this is particularly associated with turntable signals, microphone signals and signals from electric pickups, such as the electric guitar and bass), equalization (eg bass and treble adjustment), pitch controls, mixing of different input signals, or addition of electronic effects such as reverberation. Inputs can also be any number of audio sources such as disc players, CD players, digital audio players and cassette players. Most audio power amplifiers require these low level inputs, which are line level.
While the input signal to an audio power amplifier, such as the signal of an electric guitar, can measure only a few hundred microwatts, its output can be a few watts for small consumer electronic devices, such as radios clock, tens or hundreds of watts for a home stereo system, several thousand watts for a disco sound system or tens of thousands of watts for a great rock concert sound reinforcement system. While power amplifiers are available in separate units, usually targeting the hi-fi audiophile market (a niche market) of audio enthusiasts and professional sound reinforcement systems, most electronic sound products, amplifiers power that are integrated into the chassis of the main product.
Applications
• Professional and amateur mobile radio
• Portable consumer products (toys, games, etc.)
• Remote PC speakers
• PC sound cards
The above steps in such a chain are low power audio amplifiers performing tasks such as signal pre-amplification (this is particularly associated with turntable signals, microphone signals and signals from electric pickups, such as the electric guitar and bass), equalization (eg bass and treble adjustment), pitch controls, mixing of different input signals, or addition of electronic effects such as reverberation. Inputs can also be any number of audio sources such as disc players, CD players, digital audio players and cassette players. Most audio power amplifiers require these low level inputs, which are line level.
While the input signal to an audio power amplifier, such as the signal of an electric guitar, can measure only a few hundred microwatts, its output can be a few watts for small consumer electronic devices, such as radios clock, tens or hundreds of watts for a home stereo system, several thousand watts for a disco sound system or tens of thousands of watts for a great rock concert sound reinforcement system. While power amplifiers are available in separate units, usually targeting the hi-fi audiophile market (a niche market) of audio enthusiasts and professional sound reinforcement systems, most electronic sound products, amplifiers power that are integrated into the chassis of the main product.
Applications
• Professional and amateur mobile radio
• Portable consumer products (toys, games, etc.)
• Remote PC speakers
• PC sound cards