Andy,

I've never used these parts, but it is possible to buy isolation amps off
the shelf.
Prices are relativly high but they might save you a lot of time messing
about with opto isolaters. Analog devices make some of them (AD102JY,
AD104JY, AD202JY and AD204JY), as do Burr Brown (ISO103, ISO122JP, ISO165P
and ISO212JP). Here in Ireland Farnell components stock them. You can
contact them at http://www.farnell.com to get a rough idea of prices from
their online catalog. If you check out their site maybe you could let me
know your impressions of their prices?

Joe

P.S. NOT affiliated with any of the above companies!


At 21:03 26/05/98 -0400, you 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!
>==================================================================
>
>