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The Hartley oscillator is an electronic oscillator circuit in which the oscillation frequency is determined by a tuned circuit consisting of capacitors and inductors, that is, an LC oscillator. The circuit was invented in 1915 by American engineer Ralph Hartley .
Ralph Vinton Lyon Hartley (November 30, 1888 – May 1, 1970) was an American electronics researcher. He invented the Hartley oscillator and the Hartley transform, and contributed to the foundations of information theory. His legacy includes the naming of the hartley, a unit of information equal to one decimal digit, after him.
A common application of this is in the Hartley oscillator. Inductors with taps also permit the transformation of the amplitude of alternating current (AC) voltages for the purpose of power conversion, in which case, they are referred to as autotransformers , since there is only one winding.
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Ralph Hartley: University of Utah: St John's: 1910 United States Inventor of the Hartley oscillator; mathematician; winner of the IRE Medal of Honor (1946) [15] Daniel Harvey: Dalhousie University: Queen's: 1910 Canada Historian and archivist; president of the Canadian Historical Association (1937-1938) Jan Hofmeyr: University of Cape Town ...
VAC – Vačkář oscillator – Vacuum tube – Valence band – Variable length buffer – Varicap – Varistor – VDC – Vector field – Veroboard – Very high frequency – Very-large-scale integration – VHSIC hardware description language – Video cassette recorder – Video Game Console – Video Game – Video teleconference ...
Ralph Hartley – co-founder of information theory (with Shannon and Hamming); inventor of Hartley transform and Hartley oscillator; George Smoot Horsley - one of the original four employees of Shockley Semiconductor Laboratory, physicist, and pioneer in printed circuitry and semiconductors
Circuit symbol of a heptode. The development of the pentagrid or heptode (seven-electrode) valve was a novel development in the mixer story. The idea was to produce a single valve that not only mixed the oscillator signal and the received signal and produced its own oscillator signal at the same time but, importantly, did the mixing and the oscillating in different parts of the same valve.