Quote Originally Posted by Joe S. View Post
Are you trying to isolate for a final installation or for test purposes? <br>I think I would move those divider values up a couple of magnitudes from the "K" area to the "MEG" area, just for safety sake. If this is for a finished purpose I would isolate the switches etc using opto isolators and put the hardware out of human reach, I. E. in a box . . .
If you move into the "MEG" area, you'll have too much source impedance to feed the A/D input on the PIC! Unless of course you throw an op-amp set up as 1:1 unity gain voltage follower thingy...