Ujt Symbol Diagram. The internal block diagram and circuit symbol of put are shown below. A unijunction transistor is composed of a bar of n type silicon having a p type connection in the middle.
Symbol and construction of unijunction transistor ujt in unijunction transistor the pn junction is formed by lightly doped n type silicon bar with heavily doped p type material on one side. On semiconductor is the only manufacturer of put now. The ohmic contact on either ends of the silicon bar is termed as base 1 b 1 and base 2 b 2 and p type terminal is named as emitter.
The internal block diagram simplified internal circuit model and circuit symbol of a ujt is given in the figure below.
The fundamental components of this type of triggering circuit is depicted in the below shown diagram 6. Although a unijunction transistor is not a thyristor this device can trigger larger thyristors with a pulse at base b1. 2n6027 is the most common type number and it is available in the to 92 plastic package. The equivalent model represented in the b image is constituted by a diode that excites the two internal resistor s junction r1 and r2 which verify that r bb r1 r2.
