Search results
Results from the WOW.Com Content Network
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 ...
Low frequency oscillations like motorboating indicate that some device or circuit with a large time constant is involved, such as the interstage coupling capacitors [6] or transformers, or the filter capacitors and supply transformer winding. [6] In vacuum tube circuits, a common cause is feedback through the plate power supply circuit.
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. Many industrial, military or otherwise professional tubes were also produced.
Simple relaxation oscillator made by feeding back an inverting Schmitt trigger's output voltage through a RC network to its input.. An electronic oscillator is an electronic circuit that produces a periodic, oscillating or alternating current (AC) signal, usually a sine wave, square wave or a triangle wave, [1] [2] [3] powered by a direct current (DC) source.
Circuit symbol of a heptode. The development of the pentagrid or heptode (seven-electrode) valve was a novel development in the mixer story. The idea was to produce a single valve that not only mixed the oscillator signal and the received signal and produced its own oscillator signal at the same time but, importantly, did the mixing and the oscillating in different parts of the same valve.
Capacitors: determine the frequency of the oscillations and filters in the circuits. Vacuum tubes : provides a current of electrons being shot. Top panel and turret board : the outside covers of electron tube oscillator or timer circuit.
A blocking oscillator (sometimes called a pulse oscillator) is a simple configuration of discrete electronic components which can produce a free-running signal, requiring only a resistor, a transformer, and one amplifying element such as a transistor or vacuum tube.