What about an encapsulated hall effect/transformer package from LEM range of devices? I use one of these for my electricity usage meter. Farnell and RS sell them but they can be purchased for less than their exorbitant prices. Colin -- cdb, colin@btech-online.co.uk on 18/08/2009 Web presence: www.btech-online.co.uk Hosted by: www.1and1.co.uk/?k_id=7988359 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist