O'Reilly logo

Teach Yourself Electricity and Electronics, Sixth Edition, 6th Edition by Simon Monk, Stan Gibilisco

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

21

CHAPTER

Bipolar Transistors

THE WORD TRANSISTOR IS A CONTRACTION OFCURRENT-TRANSFERRING RESISTOR.” A BIPOLAR TRANsistor has two P-N junctions. Two configurations exist for bipolar transistors: a P type layer between two N type layers (called NPN), or an N type layer between two P type layers (called PNP).

NPN versus PNP

Figure 21-1A is a simplified drawing of an NPN bipolar transistor, and Fig. 21-1B shows the symbol that engineers use for it in schematic diagrams. The P type, or center, layer constitutes the base. One of the N type semiconductor layers forms the emitter, and the other N type layer forms the collector. We label the base, the emitter, and the collector B, E, and C, respectively.

21-1   At A, a simplified structural drawing ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required