>> On a side note, what is the impedance I can expect from an arc? So to >> calculate the voltage required to make x Ampere flow through it. > >An arc is a negative resistance. Negative resistance? I do not understand what this means. --=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 .