# 4 Channel Input Isolator and Voltage Divider

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• 08-13-2010, 04:27 PM
2k1Toaster
You can see the range is sort of centred on the jumper settings, and you just move that curve around based on the resistor values. Like the 3.3v versions had the center of the linear portion centred around 3.3v which gave good accuracy around the part of interest.
• 08-13-2010, 04:50 PM
PaulF
I want to be able to see the actual voltage.

So as I understand it y is what the fusion brain is reading on the analog input and in order to get the actual voltage, I need to solve that equation for x?

Any chance you've already solved that baby for x, I'm at work so I don't have a graphing calculator handy?
• 08-13-2010, 04:55 PM
2k1Toaster
Correct.

I think it is easier to visualize what is going on with the previous graph. For the equation to use in MDX, you would use this:

http://a.imageshack.us/img5/3199/opto12v.jpg
• 08-13-2010, 04:56 PM
2k1Toaster
y = -9E-06x4 + 0.001x3 - 0.071x2 + 1.595x - 2.042

y = Input Voltage
x = What the FB reads in
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