TYPES OF TRANSISTOR & BASIC FOR BJT

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 There are many types of transistors in use. Each transistor is specialized in its application. The main classification is as follows.

Transistor Types

The primary transistor is the BJT and FET is the modern version of transistor. Let us have a look at the BJTs.

Bipolar Junction Transistor

A Bipolar junction transistor, shortly termed as BJT is called so as it has two PN junctions for its function. This BJT is nothing but a normal transistor. It has got two types of configurations NPN and PNP. Usually NPN transistor is preferred for the sake of convenience. The following image shows how a practical BJT looks like.

BJT

The types of BJT are NPN and PNP transistors. The NPN transistor is made by placing a ptype material between two n-type materials. The PNP transistor is made by placing an ntype material between two p-type materials.

BJT is a current controlled device. A normal transistor which we had discussed in the previous chapters come under this category. The functionality, configurations and applications are all the same.

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