OK, here I go, biting off more than I probably can chew again, for a one off home project... I want to build a high current PC power supply, but it has to run from an automotive electrical system. The board I am am going to use has a hard drive connector on it, so I don't have to make a negative supply (thank goodness) but I want it capable of supplying at least 5A at both 5 and 12 volts. I have 2 LM2587T each capable of 5A, they are 'flyback switching regulators' I don't know what the flyback part means. I do know that somehow they can provide 12v with less than 12v supply (a good thing) and every schematic I see has them feeding a transformer to provide -12v. Will I be able to smooth these things with caps or should I look at a low pass filter using an inductor (and any ideas as to what size inductor? I am going to use diodes to mix the outputs (and the same diode on the feedback pins) For the 5v, I have 2 max787's these are regular switching regulators, but the schematics show them feeding through inductors (which I am trying to avoid) they too will feed through diodes as each of them can't supply on their own. Am I trying to do something unfeasable here or do I have a chance to get it right? Thanks for any and all comments Anthony -- Anthony Toft -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body