>> To keep the same current, the inductor creates a voltage enough >> to force that current through the new high resistance. > Bingo! This I did not know. Awesome. Neil, it's the principle behind switchmode supplies. The inductor is "loaded" with energy (Joules/wattage) by a transistor connecting it to a supply. When the transistor turns off, the energy in the inductor can be transformed into what you want by basically V=3DIR Joe ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.6172 / Virus Database: 4450/10859 - Release Date: 10/20/15 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .