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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. Edwin Armstrong presented in 1915 some ...
The tickler coil L2 has inductive coupling to L1. C2, R1, D1 and the bipolar junction transistor Q1 internal base to emitter diode are the grid-leak detector. The junction diode D1 allows a larger voltage at R1 before the two diodes conduct and clipping happens. [3] C3 is a short circuit for radio frequency. The headphone has high impedance.
It is an LC oscillator, in which the frequency is determined by a tuned circuit consisting of the inductor L1 and capacitor C. In the Armstrong circuit, a little of the energy from the output of of the transistor, the feedback necessary for oscillation, is fed back into the input (gate) circuit by a small coil L2 , called the " tickler coil ...
Most regenerative receivers used this Armstrong circuit, in which the feedback was applied to the input (grid) of the tube with a "tickler coil" winding on the tuning inductor. The gain of any amplifying device, such as a vacuum tube , transistor , or op amp , can be increased by feeding some of the energy from its output back into its input in ...
ECO oscillator schematic. In the vacuum-tube radio, an electron-coupled oscillator or ECO oscillator uses a screen-grid tube with the cathode, control grid and screen grid forming the elements of the frequency-generating circuit while the plate is in the output circuit, shielded from the oscillator circuit proper by the screen grid.
In March 1913 he discovered the principle of positive feedback independently of Edwin Armstrong, and by applying positive feedback to vacuum tube amplifiers, Meissner co-invented the electronic oscillator, [1] which became the basis of radio transmission by 1920 and has innumerable uses today.
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After corkboard, the logical move was to fiberboard, and then to ceiling board. Cork tile and linoleum led to vinyl flooring, then ceramic tile, laminate flooring, and carpeting. In 1917, Armstrong Cork signed with the Batton Company advertising agency, a relationship that continues to this day through their corporate descendants. [10]
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