Question Do PSUs supply a voltage when off?

[s355]

Does the PSU supply a voltage when the "Power" switch is off in this picture? If so, what can I power with the voltage?

 

[mindless1]

Yes, they supply 5VSB which is usually 3A or less, should be listed on the PSU label. You can power anything you want with it but keep in mind that a high load can wear out components in that subcircuit (especially the capacitor(s) ) because the PSU fan won't be running.

If you have that slight a load, you're better off just using PS-On to turn main PSU circuits on and running the light load off the main 5V rail.

You'll lose a little efficiency but gain PSU lifespan and if you really want high efficiency, use a cell phone USB charger instead for this low 5V load. However heat can again become an issue, for a high % /day runtime you will get longer lifespan by drilling several vent holes in it.

 

[s355]

Yes, they supply 5VSB which is usually 3A or less, should be listed on the PSU label. You can power anything you want with it but keep in mind that a high load can wear out components in that subcircuit (especially the capacitor(s) ) because the PSU fan won't be running.

If you have that slight a load, you're better off just using PS-On to turn main PSU circuits on and running the light load off the main 5V rail.

You'll lose a little efficiency but gain PSU lifespan and if you really want high efficiency, use a cell phone USB charger instead for this low 5V load. However heat can again become an issue, for a high % /day runtime you will get longer lifespan by drilling several vent holes in it.

You mean turn on the "Power" switch in the image before using any load?

 

[mindless1]

Yes I mean turn on the power switch, and then use the 5V rail not the 5VSB.