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power available when system off?

M

mcsman

Member
When we press the on/off button on the face of the machine, it makes momentary contact to start the action (or stop it). This implies that the power supply is always on to enable this action. The "master" switch on the power supply itself will turn everything off.

What is the voltage powering the relay that this switch is controlling? And power?

Might be nice to use this to power some device that we want to use even when the computer is off.😕
 
Most supplies only give you 5-10watts on the +5vsb. It is also often used to keep ram alive while in standby so loading to much on it could cause the machine to fail to comeback from sleep.
 
IIRC it is ment to be about 2-5W or something with most of that the inefficiencies of the power supply. Using it to power something is a little pointless as it does not have much actual power.

Though I suspect it can go a little higher, but then that is to power keyboards it you setup "wake on key press" or something similar in the bios.
 
Thanks for the replies. Was thinking to fill a cut-out of the face of the case with a digital clock, but it sounds like that might not be a good idea. Maybe I can keep the clock "alive" with a battery when the system is off, but use a different power source when the system is on. Hmmmm.
 
Especially if the +5vsb is used only to keep the time and the display was powered only when the machine is "awake."

Thanks again for the responses.
 
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