I would like to build a PIC based Redox measurement unit. I could not find any information about the signal conditioning path. I know that AC over DC is a preferred method. What about frequency range, and voltage required. What signal magnitude (uV vs mV) can be expected from the probe? I would appreciate any comments. Janusz -- 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