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Lee de Forest (August 26, 1873 – June 30, 1961) was an American inventor, electrical engineer and an early pioneer in electronics of fundamental importance. He invented the first practical electronic amplifier , the three-element " Audion " triode vacuum tube in 1906.
Lee de Forest, while decrying the excesses of the company's senior management, had good things to say about some of the technical staff, writing: "Charles Galbraith and his corps of honest, capable, hard-working men, engineers, and operators who had been instrumental in building up the American De Forest Wireless Telegraph Company, had gone ...
De Forest continued to claim that he developed the Audion independently from John Ambrose Fleming's earlier research on the thermionic valve (for which Fleming received Great Britain patent 24850 and the American Fleming valve patent U.S. patent 803,684), and de Forest became embroiled in many radio-related patent disputes. De Forest was famous ...
In 2002, Virgin Mobile in a joint venture with Singtel, set up the fourth telecommunications company in Singapore. It was the first mobile virtual network operator (MVNO) in Singapore. The operations were closed down on 11 October 2002 after failing to attract a significant number of customers.
Electronics is a scientific and engineering discipline that studies and applies the principles of physics to design, create, and operate devices that manipulate electrons and other electrically charged particles.
The first amplifying vacuum tube, the Audion, a crude triode, was invented in 1906 by Lee De Forest as a more sensitive detector for radio receivers, by adding a third electrode to the thermionic diode detector, the Fleming valve. [58] [79] [110] [111] It was not widely used until its amplifying ability was recognized around 1912. [58]
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The first commercial AM Audion vacuum tube radio transmitter, built in 1914 by Lee De Forest who invented the Audion in 1906 (from History of radio) Image 26 Manfred von Ardenne in 1933 (from History of television )