Speaking of power supplies, has anyone seen a circuit for a 317-style power supply with BOOST-MODE switching pre-regulator? I want to get 0-30V @ 1A from ubiquitous high-current 5V... BillW -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist