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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 ...
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 ...
Armstrong World Industries, Inc. and NPM Capital N.V. sold Tapijtfabriek H. Desseaux N.V. and its subsidiaries, the principal operating companies in Armstrong's European Textile and Sports Flooring business segment, to NPM Capital N.V. [7] in April 2007. [8] In 2022, AWI had $1.2 billion in revenue. [9] In 2024, it had 3,100 employees and 17 ...
Mannington Mills is a fifth generation family owned international flooring manufacturer with corporate headquarters in Salem, New Jersey. The company was founded in Salem by John Boston Campbell and his sons Neil and Kenneth in 1915. [1] [2] In 2020, Mannington acquired Phenix Flooring, a residential carpet manufacturer based out of Dalton, GA.
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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.