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The Armstrong oscillator [1] (also known as the Meissner oscillator [2]) is an electronic oscillator circuit which uses an inductor and capacitor to generate an oscillation. The Meissner patent from 1913 describes a device for generating electrical vibrations, a radio transmitter used for on–off keying .
English: Diagram of an Armstrong oscillator circuit using a FET as the active device. The Armstrong oscillator, invented by Edwin Armstrong in 1913, was one of the earliest oscillator circuits. It is an LC oscillator, in which the frequency is determined by a tuned circuit consisting of the inductor L1 and capacitor C .
Armstrong won the first case, lost the second, stalemated at the third, and then lost the final round at the Supreme Court. [ 32 ] [ 33 ] At the time the regenerative receiver was introduced, vacuum tubes were expensive and consumed much power, with the added expense and encumbrance of heavy batteries.
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Schematic symbol used in circuit diagrams for a triode, showing symbols for electrodes. All triodes have a hot cathode electrode heated by a filament, which releases electrons, and a flat metal plate electrode (anode) to which the electrons are attracted, with a grid consisting of a screen of wires between them to control the current.
Edwin Howard Armstrong (December 18, 1890 [2] – February 1, 1954 [3]) was an American electrical engineer and inventor who developed FM (frequency modulation) radio and the superheterodyne receiver system.
In the Armstrong method, the audio signal and the radio frequency carrier signal are applied to the balanced modulator to generate a double sideband suppressed carrier signal. The phase of this output signal is then shifted 90 degrees with respect to the original carrier. The balanced modulator output can either lead or lag the carrier's phase.
Armstrong Tools was an American industrial hand tool manufacturer. [1] In its final years, it existed as a brand of Apex Tool Group , LLC and manufactured the majority of its tools in the United States, focusing mostly on aerospace, government, and military users.
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