Introduction to The Transistor Switch

Chapter CHAPTER 4 The Transistor Switch

Complete Electronics Self Teaching Guide with Projects
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Complete Electronics Self Teaching Guide with Projects

  • 4The Transistor SwitchTransistors are everywhere. You can’t avoid them as you move through your daily tasks. For example, almost all industrial controls, and even your MP3 player, stereo, and television may use transistors as switches.In Chapter 3, “Introduction to the Transistor,” you saw how a transistor can be turned ON and OFF, similar to a mechanical switch. Computers work with Boolean algebra, which uses only two logic states—TRUE and FALSE. These two states are easily repre-sented electronically by a transistor that is ON or OFF. Therefore, the transistor switch is used extensively in computers. In fact, the logic portions of microprocessors (the brains of computers) consist entirely of transistor switches.This chapter introduces the transistor’s simple and widespread application—switch-ing, with emphasis on the bipolar junction transistor (BJT).Book Authorc04V107/04/2012 2:59 PM c04.indd 1357/4/2012 3:00:31 PM