I’m replacing my old power-hog home server with a new one based on the Intel D945GSEJT mainboard. This board is essentially a netbook platform that’s been “desktopified”. Among it’s weirder points are that it uses the Mobile 945GSE chipset, SODIMM ram, 44PIN IDE, and that it runs off a single 12V supply. The reason I chose this board is that it consumes 13W in idle and 18W under full CPU and GPU load which is pretty much the lowest power consumption one can get with an Atom system (excluding some server-specific boards that were beyond my budget). Not wanting to use an ATX PSU I’ve decided to build a completely new power supply for the board. Not having to bother with all the voltages needed for ATX makes this a lot easier. I’ve decided to make a high-amp 12V supply, and a 5V supply capable of driving two HDDs.
I bought (actually it was a swap for some things I no longer had use for) a 100VA toroidal-core transformer to start with. This type of transformer is widely used by audio amp builders for example as they’re more efficient and take up less space than plate transformers. After that we have the usual bridge rectifier and smoothing capacitor combo. For the latter I’m using a single 10000uF/63V electrolytic cap, a RIFA PEH169 rated for 78000 operating hours(cca. 9 years) @85C. Since we’re nowhere near the rated voltage or the temperature given for the operating hours It should probably be safe to say that this cap will outlast everything else inside the case.
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