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TerraMex · 02-25-2003, 07:18 AM

5 scsi disks array? damn. I want it

. Anyway , i think that even with all those devices, for a 550W PSU, you really shoulndt have those problems with the rails (stability issues)... unless the 5v and 3.3v rails have a low power factor (low amperage ceiling to be more precise), and the combined wattage of the PSU is misleading to the real ceiling of each rail. Could you copy the lateral info on the PSU to here? It could help.

Either way , you can use a simple circuit to transform the 12v line to the 5v :

http://www.hut.fi/Misc/Electronics/circuits/psu_5v.html

Something like this. The problem is, the 7805 does heat up a bit with higher amps, you'll need a small heatsink. Its dirty cheap to do, and works very well. Most of the reobuses out here use the same principle.

02-25-2003, 07:18 AM	#9
TerraMex Cooling Savant Join Date: Nov 2002 Location: Portugal, Europe Posts: 870	5 scsi disks array? damn. I want it . Anyway , i think that even with all those devices, for a 550W PSU, you really shoulndt have those problems with the rails (stability issues)... unless the 5v and 3.3v rails have a low power factor (low amperage ceiling to be more precise), and the combined wattage of the PSU is misleading to the real ceiling of each rail. Could you copy the lateral info on the PSU to here? It could help. Either way , you can use a simple circuit to transform the 12v line to the 5v : http://www.hut.fi/Misc/Electronics/circuits/psu_5v.html Something like this. The problem is, the 7805 does heat up a bit with higher amps, you'll need a small heatsink. Its dirty cheap to do, and works very well. Most of the reobuses out here use the same principle. __________________ "we need more cowbell."