The Three-Transistor Switch

Chapter The Three-Transistor Switch

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

  • THE THREETRANSISTOR SWITCH161B. R3 = C. IC1 = D. IB1 = E. R1 = F. R2 = ANSWERSA. 56 mAB. 500 ohmsC. 56 mAD. 0.56 mAE. 50 kΩF. 50 kΩ by choiceTHE THREETRANSISTOR SWITCH24  The circuit shown in Figure 4.19 uses three transistors to switch a load on and off. In this circuit, Q1 is used to turn Q2 ON and OFF, and Q2 is used to turn Q3 ON and OFF. The calculations are similar to those you performed in the last few problems, but a few additional steps are required to deal with the third transistor. Use the circuit diagram in Figure 4.19 to determine the answers to the following questions.+−AR1VSQ1Q2R5(Lamp)Q3R3R4R2BFIGURE 4.19Book Authorc04V107/04/2012 2:59 PM c04.indd 1617/4/2012 3:01:16 PM