I'm working on a project and need to convert 48V DC @ 40A to 12V DC with the highest amperage conservation possible. I know conversion is a lossy process, but I need the power! Would switching be best or a voltage regulator chip...I can get a +-5V chip from Radioshack...do they make a +-24v???? Lol HELP MEEEEEEEEEEEE! What do I do? Pref. I'd want to DIY.