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Old 12-30-2005, 01:05 PM   #1
exodist
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interconnect to power supplies


this is more of a hardware question that a linux question, but the box in question is a linux box, so here it goes:

my 550watt power supply burned out because I am sucking to much juice w/ my 5 fans, 2 dvd-rw's, and 6 sata hard drives. (asus a8n-sli delux board, athlon 64 3500 1gb ram)

so I have rigged up a 420watt and a 300watt..

the 420 watt is connected tot he motherboard, and a few drives/fans.

the 300 watt is connected tot he remaining drives and fans. It's motherboard connector hangs out of the case where I have a wire bridginf pin 14 and a ground (this is how atx power supplies are turned on w/o a motherboard).

I am wondering if anyone has the electical knowledge, or a link to a tutorial that will tell me how tot better wire this so that the power supplies are both runed on at once instead of me manually bridging the 300 before turning on the system.
 
Old 12-31-2005, 02:39 PM   #2
Emerson
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Basically you need to take +V from the first PSU and invert it. Looks like a job for one transistor and two resistors. Any small transistor will do.

Edit: I can calculate resistor values for you if you can tell me what transistor type you have there, it has to be NPN - assuming pin 14 is positive.

Last edited by Emerson; 12-31-2005 at 02:57 PM.
 
Old 12-31-2005, 03:28 PM   #3
RobertP
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Quote:
Originally Posted by exodist
my 550watt power supply burned out because I am sucking to much juice w/ my 5 fans, 2 dvd-rw's, and 6 sata hard drives. (asus a8n-sli delux board, athlon 64 3500 1gb ram)
Before you go to all that complexity, have you added up all the loads and compared it to the specs on the power supply? 550W should do the job handily. Your extra drives barely add up to another 100W. A 350 W supply might do on its own, although replacing the 550 is a better bet.
 
Old 12-31-2005, 04:12 PM   #4
Electro
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Just use the 420 watt power supply for your motherboard, floppy, and optical drives. Then go to Jameco Electronics and buy a dual voltage (+12 VDC, +5 VDC) switch mode power supply to power the hard drives. Before picking a power supply, calculate the amount of amperes of both 12 and 5 volt of all the hard drives. I suggest picking a power supply that has about 1.5 to 2 times the amperes of both 12 and 5 volts. To turn on the power supply you can use a transistor (a high gain or a darlington type consumes less power to switch) that connects to one of the molex connectors of the 420 watt power supply to activate the secodary power supply. Unfortunately you have to find room in the case to the mount power supply and drill a whole for the AC input. You may need to go into the BIOS and increase the delay of the hard drive look up.
 
Old 01-01-2006, 10:50 PM   #5
exodist
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I ordered a 680 watt power supply before all this happened, it will be here on tueseday. If I had gotten these messages yesterday I might have rigged it up. However the power has been out here since shortly after my message was posted and only now came back on. I live at lake tahoe california, big ski area. no snow really, but lots of rain, now have a flooded basement uncertain electricity, and no roads out because of flooding, wish me luck.
 
  


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