> Sure! I hadn't thought of it. A micropower comparator and > an SCR, and > a fuse to blow. That shall work just fine! Micropower is usually microspeed in the case of comparators. How well that works depends on what response time you can tolerate. Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist