> a) You may want to add the parallel resistor (180, 220 etc) > connected in by the relay in order to use a smaller transformer > & not have to worry about the magnetising effect of the DC > current Thanks. Looking at a couple of real-world schematics to see how they did it. I can leave room for a resistor when I make the board -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist