Hi all. I've been mired in digital for so long that I've forgotten some regular AC stuff. If I take a standard 120V 60Hz power source, then feed it through a full wave bridge rectifier I get out 120VDC oscillating, right? So far so good... Now, if I put a filter cap across that signal I can get a steady voltage...but what is that voltage? Is it 170V (120*1.414)? How do you calculate the value and rating of that capacitor given the maximum current draw? I can't seem to remember any of my capacitor formulae (or even if I knew one that would have helped in this situation). Thanks! Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist