I want to make a circuit that is able to differentiate between 4 different voltages, if the input is 5volts, one led let, if 7volts, two leds let,... etc
i tried to make it using 4 comparators but when i test every one separately it works fine, but when i put the input (5 or 7 or...) to the 4 comparators all led let regardless the input value, and some times!!!
i'm supplying the op-amps with +ve 15 and -ve 15, i placed a diode on the comparator o/p to neglect the -ve output
Please help...
thanks
i tried to make it using 4 comparators but when i test every one separately it works fine, but when i put the input (5 or 7 or...) to the 4 comparators all led let regardless the input value, and some times!!!
i'm supplying the op-amps with +ve 15 and -ve 15, i placed a diode on the comparator o/p to neglect the -ve output
Please help...
thanks