Power supply on/off

[Frank Van Zant]

In older computers, the power was turned on and off by a front panel or rear panel pushbutton or rocker switch. In the newer ATX power supplies the power management is performed via the motherboard and software.
I need to use the ATX power supply in a non-computer application. Therefore, I will have no motherboard or software to turn the required +12 volts DC on and off. I need to know how to trick the power supply on and off using external switch or switches or jumpers to perform the function. Please advise.

[YODA74]

bump, darn phone

[YODA74]

we'll try this again http://www.gideontech.com/guides/psu_powerup/psu03.jpg

then get a SPDT Switch {single Pull,double throw}

Either wire from the switch can be placed within the green or black connector on the ATX plug.
Just make sure you connect one to green and one to BLK.

[Frank Van Zant]

Thanks much. Saved me a lot of fooling around and possible smoke!

[Jhorner1]

Most ATX power supplies also have an on/off switch on the supply itself. Don't know if this will help or not but good luck.

[Frank Van Zant]

Most I've seen do not have a switch. That's what triggered my query in the first place. The answer provided previously is: Short the green wire to the adjacent black wire on the motherboard connector. That turns the supply on.

[Fruss Tray Ted]

My IBM (MY BM) is ATX and it does not have a double rowed ATX connector. Instead it has 2 flat connectors plus a third for the power trigger circuit. I needed to D/L the manual and that's how I found that the small 3 conductor plug was the trigger. I don't remmember the colors but once shorted together the PS worked. My particular prob was on the mobo itself.

Oh, Yoda, It is Single "Pole" Double Throw ;) . But anyway not needed (2 ons, one off). An SPST would be fine as an on-off switch. Depends what you have in the junk drawer (or room or house, dependintg on if you're a hopeless packrat or not... :O ).

Me? Lazy. Use the illuminated switch on the power strip... :p