I found a circuit online that claimed it was an absolute value circuit, plugged it into the simulator where it worked and tried to implement it on a breadboard. I could not get it to work. So my question is this: How does one take a DC input, like a battery and output the magnitude of its voltage regardless of the polarity of the input?
I want to be able to compare some measured voltage of a 9-V battery to some reference where the polarity of the leads don't matter for someone unknowingly connecting them the wrong way...
EDIT: In order to clarify, I'm just asking how one would go about designing a good absolute value circuit. However, the problem with my circuit might be the parts I used. I know it's wired right because I've done it several times over on the breadboard and get an output that's incorrect, of course. I also have plenty of these ICs and switched them out. Basically I've performed all the debugging you can think of.
My refined question: How would one go about making an absolute value circuit with LM324AN op-amp ICs, 1N4004 diodes and resistors aplenty.
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