> Thanks, I did see that one. Would have to get a better price for > it ( approx US$25) and any iso-amp before committing. The whole > of PortA on an 18F452 needs to be isolated so cost is a factor Be careful. Do you have to have each analog input isolated from the others, or just all the analogs isolated from the rest of the world, but sharing common circuitry among themselves? Bob Ammerman RAm Systems -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics