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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 ...
Wirecutter (formerly known as The Wirecutter) is a product review website owned by The New York Times Company. It was founded by Brian Lam in 2011 and purchased by The New York Times Company in 2016 for about $30 million.
Donald Trump’s siding with Elon Musk over visas for high-tech workers is the most significant example yet of the president-elect favoring powerful elements in his new MAGA coalition over his ...
The Armstrong 521 was a stereo hi-fi amplifier from the Armstrong Audio company and was marketed as 2 x 25W amplifier. It employed germanium AL102 transistors in its output stages and these had a reputation for failure and are now unobtainable although it is possible, with modification to replace these with newer, silicon transistors.
The study is a systematic review and meta-analysis of 113 published and unpublished randomized controlled trials that compared various types of interventions against placebos or other controls for ...
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.