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Starting the cabinet all at once. It works! And here's how...

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Popcorrin:

Sounds like Ken has a viable solution. :)
I got to thinking a person could try using 2 relays wired into the power button circuit with one of them being NO and triggered by the 110V AC cab power supply and the other one being NC and being triggered by a 12V lead off of the computer power supply.  

When the cabinet is switched on it would send 110V to the NO relay thus closing the circuit and simulating pressing the power button which in turn would turn on the computer ( I think).  This in turn would cause the NC relay to open which would simulate released the power button.

danny_galaga:

http://forum.arcadecontrols.com/index.php/topic,58932.msg1377974.html#msg1377974

1/4 scale space invaders project

danny_galaga:

I forgot to mention the reason an ordinary relay works here is because of inertia. The power may be  on virtually instantaneously (well, the speed of light anyway) but the contacts have to physically overcome the inertia of being closed. Thus there is power available to use before the contacts open. And voila! the computer switches on!

rampy:

Peale, may I inquire as to why you are so steadfast in not wanting to deviate from the example arcade power wiring diagram (the bob roberts one) but are willing to wire up all sorts of capacitors/relays elsewhere.

I'm just wondering...

I know you know there's ways of accomplishing this (bit strip/sears strip) but why it HAS to be controlled via the original switch is confusing me... why is that your requirement in this case...

You can pretty much do the same thing with a bit strip (if i understand correctly)... you would wire up the cabinet the saw way, BUT you wouldn't mount the toggle switch to turn on the AC mains... (it could still be there, but inside the cabinet... always "ON")... then run two wires from the power switch header on your mobo to a momentary contact switch (or find a momentary contact toggle switch if you are style concious) and mount it where the original power toggle switch was.... plug the pc's AC cable into the sensing part of whatever smart strip you choose... plug everything else, elsewhere on the strip... Badaboom bada bing... single turn on...

*shrug* there are fancy switching devices like those used to power on car pc/mp3 players as mentioned...  I too will try and dig up a link/info for the sake of completeness...

I'm sorry if I misunderstood your requirements, Peale... but I'm not sure why you are making it harder than it needs to be... *shrug*

Good luck!

rampy

EDIT it's not quite what you need, but it's a similiar idea for car mp3 players as mentioned earlier ebay auction for ITPS LDO Car Power Sequencer --- actually never mind...  apples/oranges

EDIT2 -->  If you *HAD* to go the "automagically short the mobo power switch pins" route (besides a tom and jerry-esque contraption that relies on scaring a chicken into laying an egg and coming down a chute...) I bet your EE friend could make a very simple circuit that when the ATX powersupply kicks on because mains are applied to it... could create some sort of 1 time pulse/latching switch thingie... it's been 10 years since I took electronics... but there's gotta be a simple way  to do what you are asking if you have to go that route...  the capacitor trick seems pretty clever, but i wonder if there's a catch.

maraxle:

I pulled a motherboard out of an old network appliance and used that in my cabinet.  It was a standard ATX motherboard, and lacked the auto-power-on feature, just like yours.  However, who ever made the appliance put this little board on there that snapped onto the 2 rows of pins where the power button, reset button, power led, reset led, and hd led all plug in.  When I have that board attached, it powers itself on.  When I get home, I can pull that little board out and take some pictures of it.  It might have a manufacturer's name on it, or possibly even be easy for you to duplicate.

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