>> You are unlikely to fry a PC supply by drawing too much current from >> it. Reversing the current direction of an output may hurt it, but that >> shouldn't be possible in your scheme. You may need a minimum load on >> the +5V output. > > Cool. For now it will always have a load, which is the programmer, and > just the two power led's on that consume around 40mA, which is > significant enough from a 120mA supply. No, I meant on the ***+5V*** output. Some PC supplies shut down all outputs when the +5V draw is below a threshold. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics