Vasile Surducan wrote:

>It's weird you've thinking to isolate the measured signals instead of
>isolating the communication... which means the same.
>If 10 bit is enough, then one PIC12F675 for every measured voltage,
>floated AT the voltage level. Communication from PIC to the rest of
>the world optoisolated with max 2 optocouplers. Very cheap and not so
>dirty.
>
The question I would have in this case is how do I end up with a 
separate VCC/VSS for each of these devices.  It would seem to me that 
deriving a separate power supply for each of these pics would get very 
expensive fairly quickly.

-forrest
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