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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 ...
Practical applications started with the invention of the diode by Ambrose Fleming and the triode by Lee De Forest in the early 1900s, which made the detection of small electrical voltages such as radio signals from a radio antenna possible with a non-mechanical device. The growth of electronics was rapid.
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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]
Lee de Forest broadcasting Columbia phonograph records (1916) [5] In 1914, de Forest established a laboratory at 1391 Sedgwick Avenue in the Highbridge section of the Bronx in New York City. Vacuum-tube transmitters had recently been developed and were found to be superior to arc-transmitters for audio transmissions. [ 6 ]
Sim Lim Square has six stories of shops, offering mainly electronic and IT products. Sim Lim Square (from Min Nan 森林 (lit. "forest"), Pe̍h-ōe-jī: sim-lîm), known in Chinese as 森林商業中心 (Pinyin: Sēn Lín Shāngyè Zhōngxīn) and commonly referred to as SLS, is a large retail complex in Singapore that offers a wide variety of electronic goods and services including cameras ...