@Hank... I really want to keep the component count low and only need to do a comparative measurement between 2 or 4 different sensors. So I hope to be able to avoid using an amplifier, if possible.

@Dave... wow there is a lot on that website to take in... I'll look there for someting I can use. (your link seemed bad... I had to delete the .htm on the end)


Any others with ideas? please chime in.