Plecto
Full Member level 5
The circuit is supposed to measure supply voltage and only output HIGH when Vs>10.22V, but it's output is HIGH regardless of input voltage. When Vs=9V I measure the inverting input to be 0.22V and the non-inverting input to be 0V so I don't understand how my NE5532 can output HIGH is such a scenario. I tried replacing the NE5532 with a LT1490 which made the circuit function as intended, but I would like to know what's going on The reason for using these op-amps instead of dedicated comparators is because I intend to use this configuration in a circuit with a supply voltage of 40V.