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Why wont LM324N work?

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Ceilingwalker

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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
 
Since you did not attach your schematic then we are blind to how you connected everything.
 
Chances are the inputs where not with the allowed range. This is not a "rail-to-rail" opamp, whereas the TL might have a wider input range.
 
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