How about a differential amplifier?

Andy Kunz wrote:

> I need to measure a voltage 3-30VDC using a PIC, but the PIC has a totally
> different ground reference than the voltage I'm supposed to be measuring
> (the two circuits _are_ connected, but I have no way of knowing how because
> each install will probably be different).
>
> I was thinking that this is an ideal situation for using an opto-isolator,
> and was wondering if anybody knew in a practical way if this would provide
> reasonable accuracy with varied temps, etc.
>
> Anybody have any other suggestions?
>
> Thanks!
>
> Andy
>
> ==================================================================
>                      Andy Kunz - Montana Design
>           Go fast, turn right, and keep the wet side down!
> ==================================================================