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Hartley oscillator using a common-drain n-channel JFET instead of a tube.. The Hartley oscillator is distinguished by a tank circuit consisting of two series-connected coils (or, often, a tapped coil) in parallel with a capacitor, with an amplifier between the relatively high impedance across the entire LC tank and the relatively low voltage/high current point between the coils.
The transitron oscillator, invented by Cledo Brunetti in 1939, [12] (although a similar effect was observed in tetrodes by Balthasar van der Pol in 1926, [20] and Edward Herold described a similar oscillator in 1935 [21]) is a negative resistance oscillator circuit using a pentode vacuum tube, in which, instead of the plate, the screen grid has ...
A 120 MHz oscillator from 1938 using a parallel rod transmission line resonator (Lecher line). Transmission lines are widely used for UHF oscillators. The vacuum-tube feedback oscillator was invented around 1912, when it was discovered that feedback ("regeneration") in the recently invented audion (triode) vacuum tube could produce oscillations ...
This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics.
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 vacuum tube audio amplifiers, center-tapped transformers were sometimes used as the phase inverter to drive the two output tubes of a push-pull stage. The technique is nearly as old as electronic amplification and is well documented, for example, in The Radiotron Designer's Handbook, Third Edition of 1940. This technique was carried over ...
3. Medications. Some medications have been associated with temporary hair loss. Most of the time hair loss related to medication is due to the drug disrupting the hair growth cycle leading to a ...
A Colpitts oscillator, invented in 1918 by Canadian-American engineer Edwin H. Colpitts using vacuum tubes, [1] is one of a number of designs for LC oscillators, electronic oscillators that use a combination of inductors (L) and capacitors (C) to produce an oscillation at a certain frequency.