An operational amplifier can act as a comparator that compares an analog voltage level with another voltage level, or some preset reference voltage and produces an output signal based on the voltage difference. Figure 5 shows a control system of an automatic lamp designed using a light-dependent resistor (LDR) and an operational amplifier as a comparator to control the light. a. Analyze the circuit and determine the V1, V2 and V3 when the resistance of the light detecting resistor is 44.8kn, 35.6kN, 28.0kn, and 21.5kn respectively. Show in the table. b. Detemine which LED is ON for each of the above four cases. c. Evaluate the positive and negative saturation voltages of the comparator.

An operational amplifier can act as a comparator that compares an analog voltage level with another voltage level, or some preset reference voltage and produces an output signal based on the voltage difference. Figure 5 shows a control system of an automatic lamp designed using a light-dependent resistor (LDR) and an operational amplifier as a comparator to control the light. a. Analyze the circuit and determine the V1, V2 and V3 when the resistance of the light detecting resistor is 44.8kn, 35.6kN, 28.0kn, and 21.5kn respectively. Show in the table. b. Detemine which LED is ON for each of the above four cases. c. Evaluate the positive and negative saturation voltages of the comparator.

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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