Unijunction transistor (abbreviated
as UJT), also called the double-base diode is a 2-layer,
3-terminal solid-state (silicon) switching device. The device has-a unique
characteristic that when it is triggered, its emitter current increases re
generatively (due to negative resistance characteristic) until it is restricted
by emitter power supply. The low cost per unit, combined with its unique
characteristic, have warranted its use in a wide variety of applications. A few
include oscillators, pulse generators, saw-tooth generators, triggering
circuits, phase control, timing circuits, and voltage-or current-regulated
supplies. The device is in general, a low-power-absorbing device under normal
operating conditions and provides tremendous aid in the continual effort to
design relatively efficient systems!
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