In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Ductapemaster wrote:

OK, here is my proposed schematic(s).  Let me know what you think.

I found that I do not have to use a differential amplifier to find the voltage across the current shunt.  I just find a value that drops 5 volts across it and then measure the voltage with the ADC.  However, this only works with the adjustable supply, as I can lose 5V there without a problem, as it drops the max output to around 16.5V (15VAC * 1.44 - 5V = 16.6).  I don't need the full range anyways.  However, this only works for the adjustable supply.  If I lost 5V on the 12V supply, I would have to be outputting 17V to start with.  I am probably going to use a differential amplifier there, use a low value resistor, and then just adjust the gain to get 0-5V range.  I still need to do the calculations there.

Other than that its all complete!

-Dan

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