ujt triggering circuit

Posted on Feb 5, 2014

A unijunction transistor (UJT) is an electronic semiconductor device that has only one junction. The UJT has three terminals: an emitter (E) and two bases (B1 and B2). The base is formed by lightly doped n-type bar of silicon. Two ohmic contacts B1 and B2 are attached at its ends. The emitter is of p-type and it is heavily doped. The resistance be

ujt triggering circuit
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tween B1 and B2, when the emitter is open-circuit is called interbase resistance. Initially the capacitor charges through R whose voltage is applied to the emitter of UJT. When the capacitor voltage reaches peak point voltage of UJT. the UJT will switch to on condition. Now the capacitor discharges through the output resistance. Thus the pulse is generated in the circuit.

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