 Mission Cyrus 1 Hi Fi integrated audio amplifier An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 hertz to 20,000 hertz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain. Image File history File linksMetadata Download high resolution version (1956x1309, 1430 KB) Summary Mission Cyrus 1 Audio Hi Fi amplifier Taken User:Light current 25 Feb 2006 Olympus C745 Auto exp using flash Licensing I, the creator of this work, hereby release it into the public domain. ...
Image File history File linksMetadata Download high resolution version (1956x1309, 1430 KB) Summary Mission Cyrus 1 Audio Hi Fi amplifier Taken User:Light current 25 Feb 2006 Olympus C745 Auto exp using flash Licensing I, the creator of this work, hereby release it into the public domain. ...
The term amplifier as used in this article can mean either a circuit (or stage) using a single active device or a complete system such as a packaged audio hi-fi amplifier. ...
In information theory, a signal is the sequence of states of a communications channel that encodes a message. ...
This article is about the SI unit of frequency. ...
This article or section needs copy editing for grammar, style, cohesion, tone and/or spelling. ...
The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels. An example of a typical high-end stereo preamplifier. ...
For information about computer bandwidth management, see Equalization (computing). ...
Tone control circuits are electronic circuits used to modify an audio signal before it is fed to speakers, headphones or recording devices by way of an amplifier. ...
BBC Local Radio Mark III radio mixing desk In professional audio, a mixing console, digital mixing console, mixing desk (Brit. ...
Edison cylinder phonograph from about 1899 The phonograph, or gramophone, was the most common device for playing recorded sound from the 1870s through the 1980s. ...
A compact disc player or CD player is an electronic device to play audio from compact discs. ...
A cassette deck is a player, or player/recorder, for compact audio cassettes. ...
Line level is the strength of an audio signal used to transmit analog sound information between audio components such as CD and DVD players, TVs, amplifiers, and mixing consoles. ...
While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. For other uses, see Watt (disambiguation). ...
History
 Three audio amplifiers in a smaller scale application Early audio amplifiers were based on vacuum tubes (also known as "valves"). Most modern audio amplifiers are based on solid state devices like transistors, FETs and MOSFETs, but there are still aficionados who prefer tube-based amplifiers, due to a perceived 'warmer' valve sound. Audio amplifiers based on transistors became practical with the wide availability of inexpensive transistors in the late 1960s. Image File history File links Metadata Size of this preview: 450 × 600 pixelsFull resolution (1704 × 2272 pixel, file size: 563 KB, MIME type: image/jpeg) A picture, taken by me in November 2006, of three power amplifiers, two Crest and one QSC. I, the creator of this work, hereby grant...
Image File history File links Metadata Size of this preview: 450 × 600 pixelsFull resolution (1704 × 2272 pixel, file size: 563 KB, MIME type: image/jpeg) A picture, taken by me in November 2006, of three power amplifiers, two Crest and one QSC. I, the creator of this work, hereby grant...
Structure of a vacuum tube diode Structure of a vacuum tube triode In electronics, a vacuum tube, electron tube, or (outside North America) thermionic valve or just valve, is a device used to amplify, switch or modify a signal by controlling the movement of electrons in an evacuated space. ...
For other uses, see Transistor (disambiguation). ...
Large power N-channel field effect transistor The field-effect transistor (FET) is a transistor that relies on an electric field to control the shape and hence the conductivity of a channel in a semiconductor material. ...
The metal-oxide-semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is by far the most common field-effect transistor in both digital and analog circuits. ...
Valve sound is the sound either from a valve amplifier or a specially designed transistor amplifier. ...
The 1960s decade refers to the years from January 1, 1960 to December 31, 1969, inclusive. ...
Design parameters Key design parameters for audio amplifiers are frequency response, gain, noise, and distortion. These are interdependent, increasing gain often leads to undesirable increases in noise and distortion. While negative feedback actually reduces the gain, it also reduces noise, and distortion. Most audio amplifiers are linear amplifiers operating in class AB. Frequency response is the measure of any systems response to frequency, but is usually used in connection with electronic amplifiers and similar systems, particularly in relation to audio signals. ...
In electronics, gain is usually taken as the mean ratio of the signal output of a system to the signal input of the system. ...
In science, and especially in physics and telecommunication, noise is fluctuations in and the addition of external factors to the stream of target information (signal) being received at a detector. ...
A distortion is the alteration of the original shape (or other characteristic) of an object, image, sound, waveform or other form of information or representation. ...
This article does not cite any references or sources. ...
Class A amplifiers tend to have very low distortion when used with small signals, and are very inefficient Class B amplifiers tend to be efficient but suffer from high distortion when used with small signals. ...
Filters and preamplifiers Historically, the majority of commercial audio preamplifiers made had complex filter circuits for equalization and tone adjustment, due to the far from ideal quality of recordings, playback technology, and speakers of the day. An example of a typical high-end stereo preamplifier. ...
Using today's high quality (often digital) source material and speakers etc, such filter circuits are usually not needed. Audiophiles generally agree that filter circuits are to be avoided wherever possible. Today's audiophile amplifiers do not have tone controls or filters.
Since modern digital devices, including CD and DVD players, radio receivers and tape decks already provide a "flat" signal at line level, the preamp is not needed other than as volume control. One alternative to a separate preamp is to simply use passive volume and switching controls, sometimes integrated into a power amp to form an "integrated" amplifier.
Phono (vinyl record) "equalization" Phono pickups provide such a weak signal that preamps are necessary. The poor noise margin of the vinyl record has also resulted in the use of "equalization", where the treble and bass are recorded with different gains. It is therefore necessary to both boost and also correct this frequency response ("equalize") of a phono signal prior to feeding into the rest of the (flat) replay chain. In recent times the RIAA equalization has been standardized, but 78's and other earlier records used a large number of other equalizations.
Applications Important applications include public address systems, theatrical and concert sound reinforcement, and domestic sound systems. The sound card in a personal computer contains several audio amplifiers (depending on number of channels), as does every stereo or home-theatre system. A public address system, abbreviated PA system, is an electronic amplification system used as a communication system in public areas. ...
Sound system has multiple meanings: A sound reinforcement system is a system for amplifying, reproducing, and sometimes recording audio. ...
A sound card (also known as an audio card) is a computer expansion card that can input and output sound under control of computer programs. ...
See also A valve (UK) audio amplifier or vacuum tube (US) audio amplifier is a valve amplifier used for sound recording, reinforcement, or reproduction. ...
Valve sound is the sound either from a valve amplifier or a specially designed transistor amplifier. ...
An audiophile, from Latin audire[1] to hear and Greek philos[2] loving, can be generally defined as a person dedicated to achieving high fidelity in the recording and playback of music . ...
In a single-ended triode (SET) electronic amplifier the entire audio signal waveform is amplified by the triode. ...
Tone control circuits are electronic circuits used to modify an audio signal before it is fed to speakers, headphones or recording devices by way of an amplifier. ...
References "Circuits" by Ceapa and Constantin.
External links - Audio Design Guide
- Class D audio amplifier module
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