CH 3 – Transistors

The success of today’s electronics is due to transistors. These components are vastly used in many different application fields. They are relatively easy and very cheap in production and use. Because they can be made very small – certainly compared to e.g. resistors and inductors – a lot of electronic equipment is small, light in weight and power efficient, which makes it portable and able to operate on batteries.


Transistors can be divided in two classes: the Bipolar Junction Transistors (BJTs) and the Field Effect Transistors (like the MOSFET and the JFET).  In this chapter, only the BJTs will be discussed, for didactic reasons. Also, the focus will be on common-emitter circuits.

Chapter Objectives

  1. Understanding the working principles of transistor, more specifically the Bipolar Junction Transistor
  2. Knowing the current-voltage relationship of diodes, and their models
  3. Analyzing circuits containing transistors

Go to 3.1 Use of transistors

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