Hi Expert How To Do This Question A B And C 1 (124.28 KiB) Viewed 134 times
Hi Expert How To Do This Question A B And C 2 (50.77 KiB) Viewed 134 times
(a) Figure Q2 (a) shows a bridge circuit used for detecting the voltage Vx. Given that R1 = R2 = 1 k 2 and R4 = 500 2, calculate the value of R3 which nulls the bridge if Vx is 0.44 V. RI R2 + Vi 10V - Vx + R4 R3 Figure Q2 (a)
(b) A water temperature sensing circuit with the transfer function of 0.1 V/°C is connected to a comparator. The heater is turned on when the water temperature is below 40 °C and turned off when the water temperature exceeds 45 °C. The output voltage of the comparator is 0 V at logic low and 10 V at logic high. The heater is controlled by a relay. Design the complete circuit. (11 marks) (C) The output temperature sensing circuit in (b) is fed into an ADC. Determine the required reference voltage for the ADC and the word size to measure 0 °C to 100 °C with a resolution of 0.1 °C. (min
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