A unijunction transistor (UJT) is a three-lead electronic semiconductor device with only one junction. It acts exclusively as an electrically controlled switch. The UJT is not used as a linear amplifier.

A Unijunction Transistor (UJT) is a three-terminal semiconductor device. The main characteristics of UJT is when it is triggered, the emitter current increases re-generatively until it is limited by …

In this article, we shall discuss about unijunction transistor (UJT), its definition, construction, circuit symbol, working and applications.

Unijunction transistor: Although a unijunction transistor is not a thyristor, this device can trigger larger thyristors with a pulse at base B1. A unijunction transistor is composed of a bar of N-type silicon having a P-type connection in the middle. See Figure (a).

This post will give you a detailed idea about UJT, its basic construction, symbol, how it works, its characteristics curve, various applications, advantages and disadvantages.

The article provides an overview of the Unijunction Transistor (UJT), including its construction, operation, and key characteristics, particularly its role as a triggering device for thyristor power-control applications.

These characteristics make the UJT suitable in switching applications. Figure 1: Unijunction Transistor (UJT). A UJT can be conveniently considered as a bar or strip of high resistivity N-type silicon commonly called the base. Two contacts B 1 and B 2 are attached to it at opposite ends.

Jun 1, 2024 · 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.

Mar 18, 2024 · The Unijunction Transistor or UJT for short, is another solid state three terminal device that can be used in gate pulse, timing circuits and trigger generator applications to switch and control either thyristors and triac’s for AC power control type applications.

Jul 21, 2018 · In this article, we learn about UJT (Uni Junction Transistor) in detail. We cover a lot about UJT like – what is basically a UJT, how they differ from other transistor models, how to construct a UJT, operation & working of a UJT, how to …