I think the Hall Effect devices (such as those from http://www.allegromicro.com) are great when you indeed need isolation between the input and output. If you do not, I think their a bit expensive for the job. Harold > I'd still like to hear comments on the Hall Effect current sensors if > anyone here has used them. > -- FCC Rules Updated Daily at http://www.hallikainen.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist