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This newb needs help understanding the posted circuit. Real quick, I'm going to post what I understand from left to right.

R53 and R62 = Voltage Divider

D2 = Clamping Diode (Clamping to 3.3V)

R45 = R1 in basic (R2/R1)Vin = Vout op amp formula

This is where I get stuck.

Let's call the node b4 R45 Vin. We would have [(Vin-Vref)/R45] = [(Vref - Vo)/R2] - however no R2. Instead, there's a diode that is in the off (depending on how you look at it) preventing any output from the first op-amp. Where then I guess the second OP Amp equation looks like Vo = [(Vin-Vref)/R45]. I am pretty sure I am missing some inverse logic in all of this, but regardless, I hope I got what I was trying to say across. Click Here for the Op-Amp datasheet. Any help would be greatly appreciated. Namely, what is that diode doing? What's the purpose of this circuit? Thank you.

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# Circuit Explanation

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