Devices with this type of negative resistance include the IMPATT diode, UJT, SCRs and other thyristors, electric arc, and gas discharge tubes like thyratron tubes, fluorescent lamps and neon lights.
22.
Hot-cathode, gas discharge tubes such as the thyratron may also achieve similar levels of efficiency but heated cathode filaments are delicate and have a short operating life when used at high current.
23.
For a cold-cathode thyratron the trigger voltage on the control grid will typically be positive, and a flash-over from control grid to cathode will initiate the arc discharge in the tube.
24.
In the " Mark X ", the switching and level changes in the rear speakers are done automatically using a thyratron and mechanical relay system operated by means of notches on the edge of the film.
25.
Power devices such as silicon controlled rectifiers and thyristors ( as well as the mercury valve and thyratron ) allow control of the start of conduction, but rely on periodic reversal of current flow to turn them off.
26.
This example can be implemented with a current or voltage source, and a threshold device with hysteresis ( neon lamp, thyratron, diac, reverse-biased bipolar transistor, or unijunction transistor ) connected in parallel to the capacitor.
27.
If the amplified beat frequency signal is large enough ( indicating a nearby object ), then it triggers the 4th tube ( a gas-filled thyratron ); the thyratron conducts a large current that sets off the electrical detonator.
28.
If the amplified beat frequency signal is large enough ( indicating a nearby object ), then it triggers the 4th tube ( a gas-filled thyratron ); the thyratron conducts a large current that sets off the electrical detonator.
29.
Douglas Aircraft built the equipment, implementing Cecil Hasting s suggestion ( RAND P-113 ) for a noise source ( most likely the well known behavior of the 6D4 miniature gas thyratron tube, when placed in a magnetic field ).
30.
By circulating the gas between the electrodes, which was using lossless capacitor charging and replacing the spark-gap with a thyratron, repetition rates in excess of a thousand pulses per second were subsequently achieved with various designs of TEA laser.
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