"Rick C." wrote: > A no load condition and a drop in voltage on the input > of the78xx will blow it. I have seen some circuits with > a diode placed across the 78xx, anode to the output, cathode > to the input to protect it. I've never seen this approach with 78xx regs - interesting. I've only seen it with 317 types. -- Best regards Tony mICros http://www.bubblesoftonline.com mailto:sales@bubblesoftonline.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.