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QSC is an American manufacturer of audio, video and control products such as amplifiers, loudspeakers, cameras, video endpoints, and digital signal processors including the Q-SYS networked audio, video and control platform. QSC and Q-SYS products are used by audio and video professionals for commercial applications, including corporate, higher ...
Mullard Circuits for Audio Amplifiers is a famous book by the Technical Services Department of Mullard Ltd, a British valve manufacturing company. First published in 1959 and then reprinted several times it contained a number of designs by Mullard engineers for high quality audio amplifiers, which were to be used by amateur constructors as well as by manufacturers as the basis for many ...
Audio stereo power amplifier made by McIntosh The internal view of a Mission Cyrus 1 Hi Fi integrated audio amplifier (1984) [1]. An audio power amplifier (or power amp) amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones.
Manufacturers have a team of technical engineers, writers and illustrators who compile information for these service manuals. Some companies create aftermarket repair manuals for the general public to purchase such as Clymer Haynes [1] and Triple M FZCO. [2] These manuals are also generally available as online auto repair manuals.
Circuit board layout is conservative, easy to access, repair or modify. Dynamics and reliability are excellent. Its only weak point is that the preamp and power amp modules are installed in the chipboard cabinet with lack of electromagnetic shielding, resulting in a need to physically separate the amp head from bass pickups and speakers.
When an amplifier is pushed to create a signal with more power than its power supply can produce, it will amplify the signal only up to its maximum capacity, at which point the signal can be amplified no further. As the signal simply "cuts" or "clips" at the maximum capacity of the amplifier, the signal is said to be "clipping".
In general, the power amplifier is the last 'amplifier' or actual circuit in a signal chain (the output stage) and is the amplifier stage that requires attention to power efficiency. Efficiency considerations lead to the various classes of power amplifiers based on the biasing of the output transistors or tubes: see power amplifier classes below.
From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...