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

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Current Division Method

The generalized current divider formula is given by the following relation below,