If a relatively higher cost is not a problem, Vicor do some really nice compact DC-DC power supplies. You may need to use multiple units to get all the supply voltages you need. The one I looked at was 150W at +5V and could handle 66-160Vdc on the input. www.vicr.com Regards Dave... ----- Original Message ----- From: "Mark Peterson" To: Sent: Wednesday, September 20, 2000 4:45 PM Subject: [EE]: 125 VDC Input ATX Supply > I need to power a PC from a nominal 125 VDC source. The voltage may vary > from 110 to 140 VDC. I want a 300 W ATX supply that will be a direct swap > with the existing 120 VAC unit in the PC. I'm finding that this type of > supply is very rare. A couple vendors in China responded to my email > inquiry stating that they would consider modifying their standard units. > They lost interest when I told them I only need three or four of them. > > I've considered modifying a standard supply, which are abundant and cheap. > I searched for schematics but found that they are nearly impossible to get. > It appears that the first thing a standard ATX supply does is rectify the > AC input, filter it a bit, and then present it to the switching part of the > supply. I'm wondering if I can simply connect the 125 VDC source just > ahead of this switching section. I'm going to do some experimenting but I > wanted to check if anybody knows of a source of such a supply or if they > have ever tried what I'm planning to attempt. > > Thanks. > > Mark P > > -- > 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 > > -- 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