working on a comparator circuit which measures two different voltages on two seperate op amps then using a NAND gate , if both op amp outputs are same then output drives LED (going to be a 400 ohm relay)
How about using two open-collector voltage comparators like **broken link removed**s? Set one up to switch high when it's input is >3V; set the other up to switch high when it's input is >4V. Wire the two outputs together to a common pull-up resistor. The combined output will be high if and only if both comparators are above their respective trip points.
I was under the assumption that both inputs must be true, else relay is off. Actually after re-reading OP I wonder if he wants XOR function? I did not mean to offend, often forum communication creates misinterpretation.
I was under the assumption that both inputs must be true, else relay is off. Actually after re-reading OP I wonder if he wants XOR function? I did not mean to offend, often forum communication creates misinterpretation.
Like you I dont not know for sure what the OP wants to do.
I assumed that the mention of two diodes would start bells ringing in MrDebs head, as a possible solution.
Like you I dont not know for sure what the OP wants to do.
I assumed that the mention of two diodes would start bells ringing in MrDebs head, as a possible solution.