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Using toggle switch instead of momentary switch

E

exyxxx

n00b
Joined
Jun 10, 2008
Messages
59
Hello!

Not sure if this belongs to case modifications.

I have an old case (IBM 5150 clone) with an AT PSU and its toggle switch. I was hoping to use the toggle switch along with ATX PSU - is this possible? I have googled for momentary toggle switches but it would be ideal to use the one with the case (the switch can be removed from the PSU) since there's a hole it covers.

You can barely see the switch in this picture: http://www.granneman.com/images/ibm_pc_5150.jpg

Any suggestions and ideas are welcome.
 
Turn on your computer by pressing its power button and holding it. That's why an AT PSU switch won't work in the place of a momentary switch. If you don't want to drill a hole in the case for a momentary switch, the only alternatives I know of are to install it in a rear bracket cover or front disk drive bay cover.
 
I can think of a couple of options to use a physical on-off switch with a modern motherboard and PSU.

One option is to set up your motherboard to auto boot when power is applied (this is usually an option in the bios) and then connect the switch as it was originally intended between the mains inlet and the power supply electronics. Upsides of this approach are no special electronics involved and no standby current. Downsides are no soft off functionality and you need to open up the PSU to divert the main input wiring to your switch (which will probablly also involve making an extra hole in the PSUs case). This will of course void your PSUs warranty.

Another other option would be to build a power switch supervisor circuit that monitors the state of the power switch and of the power supply generates pulses on the power switch line as appropriate. Should be a fairly simple task for a PIC or similar.
 
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