Wikipedia class c amplifier is this uses
Class XD or Crossover Displacement is a proprietary and patented [1] amplifier technology developed in-house by Cambridge Audio. First appearing in in the Azur A integrated amplifier, the Crossover Displacement design sought to combine the performance of a traditional Class A design with the efficiency of Class B but without the linearity and distortion limitations of Class AB. It is at the point at which the output moving from one transistor to another the crossover point that a small amount of distortion is created. Avoids this crossover distortion because the transistors are always on but at the expense of a lot of heat generation.
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Talk:Power amplifier classes
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The magnetic amplifier colloquially known as a "mag amp" is an electromagnetic device for amplifying electrical signals. The magnetic amplifier was invented early in the 20th century, and was used as an alternative to vacuum tube amplifiers where robustness and high current capacity were required. The magnetic amplifier was most prominent in power control and low-frequency signal applications from to about , when the transistor began to supplant it. Combinations of transistor and mag-amp techniques are still used. Visually a mag amp device may resemble a transformer , but the operating principle is quite different from a transformer — essentially the mag amp is a saturable reactor. It makes use of magnetic saturation of the core, a non-linear property of a certain class of transformer cores. For controlled saturation characteristics, the magnetic amplifier employs core materials that have been designed to have a specific B-H curve shape that is highly rectangular, in contrast to the slowly tapering B-H curve of softly saturating core materials that are often used in normal transformers. The typical magnetic amplifier consists of two physically separate but similar transformer magnetic cores , each of which has two windings: a control winding and an AC winding. Another common design uses a single core shaped like the number "8" with one control winding and two AC windings as shown in the photo above.
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Class D Audio Amplifiers: What, Why, and How
An audio power amplifier or power amp is an electronic amplifier that amplifies low-power electronic audio signals such as the signal from radio receiver or electric guitar pickup to a level that is high enough for driving loudspeakers or headphones. Audio power amplifiers are found in all manner of sound systems including sound reinforcement , public address and home audio systems and musical instrument amplifiers like guitar amplifiers. It is the final electronic stage in a typical audio playback chain before the signal is sent to the loudspeakers. The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification of the signal this is particularly associated with record turntable signals, microphone signals and electric instrument signals from pickups, such as the electric guitar and electric bass , equalization e. The inputs can also be any number of audio sources like record players , CD players , digital audio players and cassette players. Most audio power amplifiers require these low-level inputs, which are line level.
Category:Electronic amplifiers
A vacuum tube , electron tube , [1] [2] [3] valve British usage , or tube North America , [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot cathode for fundamental electronic functions such as signal amplification and current rectification. Non-thermionic types such as a vacuum phototube , however, achieve electron emission through the photoelectric effect , and are used for such purposes as the detection of light intensities. In both types, the electrons are accelerated from the cathode to the anode by the electric field in the tube. The simplest vacuum tube, the diode , invented in by John Ambrose Fleming , contains only a heated electron-emitting cathode and an anode. Electrons can only flow in one direction through the device—from the cathode to the anode. Adding one or more control grids within the tube allows the current between the cathode and anode to be controlled by the voltage on the grids.
Class-D amplifier
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The following 74 pages are in this category, out of 74 total. This list may not reflect recent changes learn more. From Wikipedia, the free encyclopedia. Wikimedia Commons has media related to Amplifier circuits.
The resistance-capacitance coupling is, in short termed as RC coupling. This is the mostly used coupling technique in amplifiers. The constructional details of a two-stage RC coupled transistor amplifier circuit are as follows. The two stage amplifier circuit has two transistors, connected in CE configuration and a common power supply V CC is used. The potential divider network R 1 and R 2 and the resistor R e form the biasing and stabilization network. The emitter by-pass capacitor C e offers a low reactance path to the signal. The resistor R L is used as a load impedance.
An amplifier aka amp is an electronic device that can increase the power of a signal. An amplifier uses electric power from a power supply to increase the amplitude of a signal. The amount of amplification provided by an amplifier is measured by its gain: the ratio of output voltage, current, or power to input. An amplifier is a circuit that has a power gain greater than one.
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