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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.
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 ...
In 2011, Armstrong's net sales were $2.86 billion, with operating income of $239.2 million. [17] Armstrong Cabinets was sold by Armstrong World Industries to American Industrial Partners on October 31, 2012. Armstrong spun off its flooring business into a new company, Armstrong Flooring (NYSE: AFI) on April 1, 2016.
Armstrong Flooring is a Pennsylvania corporation incorporated in 2016. It was spun off as an independent entity from Armstrong World Industries in April 2016. The company manufactures flooring products in the US in Beech Creek, Pennsylvania; Jackson, Mississippi; Kankakee, Illinois; Lancaster, Pennsylvania; South Gate, California; and Stillwater, Oklahoma; and internationally in Shanghai ...
When it comes to blockbuster weight-loss drugs like Wegovy and Ozempic, opinion among some of President-elect Donald Trump’s top advisers and health policy nominees appears deeply split.