I'm making a circuit to turn-on one LED if a tank goes overtemp, and another LED if the tank goes undertemp. I chose to build a simple window comparator circuit. I used an
LM324N (TI) Quad op-amp and no matter what is put on the inverted and non-inverted inputs, the output was always the Vcc value. I then used a TLC272CP (TI), and it solved it. I'm new to this and was hoping someone could explain why the Quad op-amp didn't work. Thank you