Working with Transistor Amplifiers

Chapter Working with Transistor Amplifiers

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

  • CHAPTER 8 TRANSISTOR AMPLIFIERS320amplifier, you can grasp the building block that makes up amplifier circuits used in elec-tronic devices such as cellphones, MP3 players, and home entertainment centers.Many amplifier circuit configurations are possible. The simplest and most basic of amplifying circuits are used in this chapter to demonstrate how a transistor amplifies a signal. You can also see the steps to design an amplifier.The emphasis in this chapter is on the bipolar junction transistor (BJT), just as it was in Chapter 3, “Introduction to the Transistor,” and Chapter 4, “The Transistor Switch,” which dealt primarily with the application of transistors in switching circuits. Two other types of devices used as amplifiers are also examined: the junction field effect transistor (JFET) (introduced in Chapters 3 and 4), and an integrated circuit called the operational amplifier (op-amp).When you complete this chapter, you will be able to do the following: ■ Calculate the voltage gain for an amplifier. ■ Calculate the DC output voltage for an amplifier circuit. ■ Select the appropriate resistor values to provide the required gain to an amplifier circuit. ■ Identify several ways to increase the gain of a one-transistor amplifier. ■ Distinguish between the effects of a standard one-transistor amplifier and an emitter follower circuit. ■ Design a simple emitter follower circuit. ■ Analyze a simple circuit to find the DC level out and the AC gain. ■ Design a simple common source (JFET) amplifier. ■ Analyze a JFET amplifier to find the AC gain. ■ Recognize an op-amp and its connections.WORKING WITH TRANSISTOR AMPLIFIERS1  In Chapter 3 you learned how to turn transistors ON and OFF. You also learned how to calculate the value of resistors in amplifier circuits to set the collector DC voltage to half the power supply voltage. To review this concept, examine the circuit shown in Figure 8.1.Book Authorc08V107/04/2012 3:18 PM c08.indd 3207/4/2012 3:18:59 PM