Board to power on PSU?

August 29, 2011 at 11:20:12
Specs: Windows 7, Intel Core i5/8GB
I'm looking for a board that can connect the case power button that in turn powers on a power supply all without using a motherboard. Does such a device exist??

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#1
August 29, 2011 at 11:49:54
Wire a momentary on switch to the proper leads. If you don't want to modify the power supply use a power supply extension or salvage a motherboard connector.

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#2
August 29, 2011 at 15:04:57
Why do you want to do that?

1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.


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#3
August 29, 2011 at 18:37:28
To power on a hard drive, DVD-ROM drive and USB hub before the embedded system powers on (which is connected to the hub)

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Related Solutions

#4
August 29, 2011 at 19:03:15
Computer (Switching Mode) power supplies must have at least a minimal load connected to them or they won't start up. Those three things require very little current (amperage).
The current (amperage) minimums are usually printed on it's label.

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#5
August 29, 2011 at 23:17:45
When drives power up they have their own initialization procedures. Possibly if all that's done before you power the motherboard, the bios won't detect them I'm not sure though as I've never tried something like that.

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#6
August 30, 2011 at 04:28:44
The drives are USB powered. The embedded system will detect them either when the system first loads up or once booted into the OS.

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#7
August 30, 2011 at 13:26:22
Use wizard's suggestion.

1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.


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#8
August 30, 2011 at 16:27:16
"The drives are USB powered."

It that case the hard drive and DVD drive draw only 500ma (1/2 amp) each, max, and the USB hub no more than 50ma or so, at +5v, and nothing is using +12v from the PS. . That's definitely not enough of a load for the power supply to start up.


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#9
August 30, 2011 at 21:25:28
If everything is USB powered (5v) a PC power supply is not needed. Get a power supply like that used for external USB drives.

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#10
August 31, 2011 at 05:17:12
The purpose to my project is to make an embedded desktop. I want it to be as clean and as functional as possible. Dangling power bricks from the back of the case won't do. I know that a PC power supply is more than overkill so I'll get the cheapest I can find. Thanks for the input.

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#11
August 31, 2011 at 05:30:11
If you think a brick is unacceptable consider a small switching ps like those in small form factor omputers. i've had some that rated 50-75 watts about a third of the size of a regular ps.

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