The magnetic amplifier is an electromagnetic device for amplifying electrical signals. It uses a non-linear property of a certain class of transformer cores. It 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. It has now been almost superseded by the transistor-based amplifier, except in a few extremely demanding applications. A quadrupole (four-pole) electromagnet, used to focus particle beams in a particle accelerator. ... (19th century - 20th century - 21st century - more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901–2000 in the sense of the Gregorian calendar (1900–1999 in the... In electronics, a vacuum tube (American English) or (thermionic) valve (British English) is a device generally used to amplify, or otherwise modify, a signal by controlling the movement of electrons in an evacuated space. ... Assorted transistors Transistor was also a common name for a 1960s era handheld transistor radio. ...
The "Magnetic-Field" type of amplifiers are the CLASS-"H" type, better known as a magnetic field type. World war II Germany perfected this type of amplifier, and it was used for instance in the V2 rocket.
The magneticamplifier 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.
For controlled saturation characteristics the magneticamplifier 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.
Magneticamplifiers were used extensively as the switching element in early switched-mode (SMPS) power supplies [Abraham Pressman, Switching Power Supply Design], as well as in lighting control.
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