Would you be able to send me a copy of the conductivity side of the = circuit? Been looking on the net for something like that and not had much success. >>> marco.genovesi@LIBERO.IT 02/22/02 05:43AM >>> because I use it also for other types of frequency sensor (example: a = 4093-based circuit for water conductivity measurement). Many thanks to All for suggestions Marco -- 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