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The circuit shown in Figure DP 3-11 is designed to help orange growers protect their crops against frost by sounding an alarm when the temperature falls below freezing. It contains a thermistor that has a resistance Ro=620 N at the temperature To=20°C=293 °K and ß=3330 °K. (See problem DP 3-9.) The alarm will sound when the voltage at the – input of the comparator is less than the voltage at the + input. Using voltage division twice, we see that the alarm sounds whenever R4 R2 RT + R2 R3 +R4 Determine values of R2, R3, and R4 that cause the alarm to sound when T = 50 °C 12 V 12 V [K Thermistor RT R3 Buzzer

The circuit shown in Figure DP 3-11 is designed to help orange growers protect their crops against frost by sounding an alarm when the temperature falls below freezing. It contains a thermistor that has a resistance Ro=620 N at the temperature To=20°C=293 °K and ß=3330 °K. (See problem DP 3-9.) The alarm will sound when the voltage at the – input of the comparator is less than the voltage at the + input. Using voltage division twice, we see that the alarm sounds whenever R4 R2 RT + R2 R3 +R4 Determine values of R2, R3, and R4 that cause the alarm to sound when T = 50 °C 12 V 12 V [K Thermistor RT R3 Buzzer

Introductory Circuit Analysis (13th Edition)
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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The circuit shown in Figure DP 3-11 is designed to help orange growers protect their crops against frost by sounding an alarm when the temperature falls below freezing. It contains a thermistor that has a resistance Ro=620 N at the temperature To=20 °C=293 °K and ß= 3330 °K. (See problem DP 3-9.) The alarm will sound when the voltage at the - input of the comparator is less than the voltage at the + input. Using voltage division twice, we see that the alarm sounds whenever R2 R4 RT + R2 R3 +R4 Determine values of R2, R3, and R4 that cause the alarm to sound when T = 50 °C 12 V 12 V Thermistor RT R3 Buzzer Comparator RA R2 Figure DP 3-11 Hi
Transcribed Image Text:The circuit shown in Figure DP 3-11 is designed to help orange growers protect their crops against frost by sounding an alarm when the temperature falls below freezing. It contains a thermistor that has a resistance Ro=620 N at the temperature To=20 °C=293 °K and ß= 3330 °K. (See problem DP 3-9.) The alarm will sound when the voltage at the - input of the comparator is less than the voltage at the + input. Using voltage division twice, we see that the alarm sounds whenever R2 R4 RT + R2 R3 +R4 Determine values of R2, R3, and R4 that cause the alarm to sound when T = 50 °C 12 V 12 V Thermistor RT R3 Buzzer Comparator RA R2 Figure DP 3-11 Hi
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