Junction transistors

Junction transistors are of two types

(a) NPN                                            (b) PNP

It has component

(a) Emitter                        (b) Base                                           (c) Collector

Emitter is heavily doped, collector is moderately doped and base is thin and lightly doped.

Symbol

Biasing

A transistor can be operated in three different modes.

A transistor can be operated in three different modes. Common-emitter, common  collector and common base.