Pre start led source

[Realmjumper78]

I'm messing about with some mods and have a switch plate that consists of a toggle switch, and LED and a momentary switch. The sequence I'm wanting is: toggle on which lights led and this then means the momentary switch is live to be pressed to start the machine. What I get so far is the toggle on is providing power to the LED but that is then powering the machine on, before I get to press the momentary. Does anyone have any suggestions on how the make this work as desired?

 

[popatim]

We cant help you withoutmore information in your system and how things are hooked up.
For example, how are you power up the led's if they are connected to the psu which shouldn't be on until you press the momentary...

 

[Realmjumper78]

It's a standard ATX hookup. I'm taking a splice from the normal PWR Switch +ve and the -ve and looking to turn this in to a loop that incorporates the new switch/led/momentary combination. Essentially I am looking to know if there is a feed that is live in a normal build prior to the chasis power button being pressed. If the answer is no, then obviously the LED will not be incorporated as I know already how to wire in the toggle and momentary. If however anyone knows of a feed that is +ve prior to momentary activation then that would be handy thank you.

 

[popatim]

Your motherbd may provide 5v while off over the usb port, if it has that feature. You'll need to check the motherbds documentation. The other live voltage that are there while the system is techincally 'off' are not anything you could run leds from nor would I recommend tapping into them.

 

[Tayonas]

I sort of have a solution, maybe ... if you can use a multimeter ... When your PC is shutdown Find a +5v that's live on the 24 pin ATX power supply. You could then pop the connector out along with a ground and solder into it/splice/whatever.

Then you can put the power button onto the momentary ...

HOWEVER ... If the +5v to light the LED is also connected to the momentary, you will pop something. What you might in actual fact have to fit will be a powered relay switch to make a break for the momentary to be enabled/disabled. It will be an NO relay.

You will want to buy a project box for it if you aren't modding it into your case, but Id use testboard and hook it up.

Make sense?

You put the relay switch in parallel with the LED. Hook up -ve directly to memoentary, run wire from +ve to one side of the NO gate on the relay, then the other side to the momentary.

Now when the LED is sent power, the relay closes and allows for the momentary button to be pressed. I know for a fact it works, I've done it.