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By 1912, vacuum tube operation was understood, and regenerative circuits using high-vacuum tubes were appreciated. While growing up, Armstrong had experimented with the early temperamental, "gassy" Audions. Spurred by the later discoveries, he developed a keen interest in gaining a detailed scientific understanding of how vacuum tubes worked ...
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. So this design, getting most gain out of one ...
The non-linear characteristic of the transistor or tube also demodulated the RF signal to produce the audio signal. The circuit diagram shown is a modern implementation, using a field-effect transistor as the amplifying element. Armstrong's original design used a triode vacuum tube. Meissner oscillator schematic, original 1913 vacuum tube version
In the 1920s, the Westinghouse company bought Lee de Forest's and Edwin Armstrong's patent. During the mid-1920s, Amplifying vacuum tubes revolutionized radio receivers and transmitters. Westinghouse engineers developed a more modern vacuum tube. The first radios still required batteries, but in 1926 the "battery eliminator" was introduced to ...
31 January – Edwin Howard Armstrong first demonstrates the employment of three-element vacuum tubes in circuits that amplify signals to stronger levels than previously thought possible and that could also generate high-power oscillations usable for radio transmission.
The superheterodyne receiver, invented in 1918 by Edwin Armstrong [10] is the design used in almost all modern receivers [11] [9] ... Vacuum tubes were bulky ...
A high vacuum tube needs a gridleak resistor parallel to the gridleak capacitor. In Fig. 3, the LC circuit L and C select the receiver frequency. C2 is the gridleak capacitor and helps to demodulate the received signal. B1 is the A-battery or heater battery and B2 is the B-battery or anode battery. In Fig. 8, L, C, B1 and B2 are as in Fig. 3.
The autodyne circuit was invented by Edwin Howard Armstrong of Columbia University, New York, NY. [citation needed] He inserted a tuned circuit in the output circuit of the Audion vacuum tube amplifier. [citation needed] By adjusting the tuning of this tuned circuit, Armstrong was able to dramatically increase the gain of the Audion amplifier ...