7. Determine the necessary value of R2 in Figure 16-57 so that the circuit will oscillate. Neglect the forward resistance of the zener diodes. (Hint: The total gain of the circuit must be 3 when the zener diodes are conducting.) 8. Explain the purpose of R3 in Figure 16–57. Di D2 6.8 V 6.8 V R3 47 kN R1 100 kfN : o Vout R2 R4 0.015 µF 1.0 kN R5 1.0 kN 0.015 μF

7. Determine the necessary value of R2 in Figure 16-57 so that the circuit will oscillate. Neglect the forward resistance of the zener diodes. (Hint: The total gain of the circuit must be 3 when the zener diodes are conducting.) 8. Explain the purpose of R3 in Figure 16–57. Di D2 6.8 V 6.8 V R3 47 kN R1 100 kfN : o Vout R2 R4 0.015 µF 1.0 kN R5 1.0 kN 0.015 μF

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter12: Electronic Control Devices

Section: Chapter Questions

Problem 4RQ: What is the difference between a diode and rectifier?

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