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+5V Standby

post #1 of 8
Thread Starter 
Does this rail only have power if the PSU is off? Do I even make sense? lol

What I'm trying to do is have a LED come on when the computer is off (a standby LED).

Would I be able to get my power off of the standby rail (on the ATX molex) or would I have to do it some other way?
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post #2 of 8
The +5VSB - stand-by rail will have power running when the system is on as well as off. So you may have to use some other logic device to sense when main PC power is on to turn off the LED.. and then switch on when the system is shut down ... this assumes that AC and the PSU AC switch will be left on.

For the 24-Pin pinout see the spec - pg 20 here

You could also pick it up from a header off the MB.. most have these available.

Do watch the current draw as the average os about 1.5-2A available and LEDs also need to be limited to prevent burnout. See here for a guide
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post #3 of 8
Thread Starter 
How would I have it be able to sense when the main power is off and then turn on the LED?
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post #4 of 8
Many ways ... simple transistor, opto-coupler, 555 timer even ....
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post #5 of 8
Thread Starter 
Well I have no idea on how I would do this. Anybody have maybe a FAQ on this or a link to a Tutorial?
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post #6 of 8
This is in the realm of some small electronics which is adding value to the LED that you will wish to use.

Here is an article on Opto-coupler's which are a great device to use and be electrically isolated.
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post #7 of 8
Thread Starter 
I just talked to someone and he suggested a relay, but couldn't give a good explanation on what it is and how it works.

Do you have a good description on what this is?
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2xSeagate Barracuda 7200.10 250Gb in RAID0 DVD-RW Windows 7 x64 RC1 Sceptre 20.1" 
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post #8 of 8
A reed relay is used as a switch and depending on the number of 'Poles' can do several things with a single change.

The Opto is similar to the relay just no moving parts and a bit more fun to play / learn about.

More here on relays and small projects to get you thinking
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