3 comparators should compare 12V output from three bridge rectifiers, and remaining comparator should monitor the voltage corresponding to temperature ( from thermistor). In first 3 comparators, the output should turn off when the corresponding rectified input voltage goes below a certain value, and the remaining comparator output should be turned off when temperature goes above a particular value.
I am also using a regulator IC, which is fed from any of the three rectifiers and gives a constant 5V output. The each comparator output should be also able to drive a 12v relay. So in my circuit there are four 12V relays.
Is there any means like using transistor for driving the relay? pls help me