Free book. Of interest to all in electronics and especially so if power arcanery is your thing. Prof Barry Williams "Power Electronics: Devices, Drivers, Applications, and Passive Components" Looks excellent http://www.eee.strath.ac.uk/%7Ebwwilliams/book.htm Ranges from intro tutorial to advanced. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist