Answered: RL V, R1 CdS

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

Design the following conditions using an operational amplifier:

Cadmium sulfide (CdS) is commonly used to fabricate resistors whose value depends on the intensity of light shining on its surface. In Figure 1, a CdS “photocell” is used as the feedback resistor R_f. In total darkness, it has a resistance of 100kΩ and a resistance of 10kΩ under a light intensity of 6 candela. R_L represents a circuit that is activated when a voltage of 1.5V or less is applied to its terminals. Choose R₁ and V_S so that the circuit represented by R_L is activated by a light of 2 candela or brighter.

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