Main > Main Forum
How to power-on motherboard?
<< < (3/3)
shadowdrak:
The cap trick is pretty clever.  Current flows through the capacitor at first, shorting the jumper.  As the capacitor charges up, it resists the flow of electricity which opens the jumper again.  It needs to be a small capacitor though, otherwise it will short the jumper for more than 4 seconds, causing it to turn off again.  Then you just power the computer on by turning on the surge strip.
SirPeale:

--- Quote from: paigeoliver on October 23, 2004, 11:25:53 pm ---Peale what exactly does #2 do? Can you elaborate on the technique? Also, will the negative pin have continuity to ground?

--- End quote ---

Read the post directly above this one.  Set your multimeter for DC voltage, and take a reading on those two pins.  If it shows a negative number, reverse the leads.  Whichever black is on (negative) is the one the negative lead on the cap should be on.
SirPeale:

--- Quote from: AmericanDemon on October 23, 2004, 11:32:38 pm ---Yeah me too.  You could also use a small wire and jump the two pins.  This is often done by people using a watercooling set up.

--- End quote ---

I'm guessing you mean on the ATX power connector, and not on the motherboard pins.

This may or may not work.  Sometimes this can screw up the POWER_GOOD signal, and the board won't boot (which is where this whole brainchild came into play).  It wouldn't be an issue if you just wanted to use an ATX PS without being connected, but there *may* be issues.  With the cap trick, there aren't any issues, other than shutting down from Windows.
AmericanDemon:

--- Quote from: Peale on October 24, 2004, 04:24:30 pm ---
--- Quote from: AmericanDemon on October 23, 2004, 11:32:38 pm ---Yeah me too.  You could also use a small wire and jump the two pins.  This is often done by people using a watercooling set up.

--- End quote ---

I'm guessing you mean on the ATX power connector, and not on the motherboard pins.

This may or may not work.  Sometimes this can screw up the POWER_GOOD signal, and the board won't boot (which is where this whole brainchild came into play).  It wouldn't be an issue if you just wanted to use an ATX PS without being connected, but there *may* be issues.  With the cap trick, there aren't any issues, other than shutting down from Windows.

--- End quote ---

Yeah thats exactly what I meant w/ an ATX powersupply.  Watercooling setups routinely use this to prime the pumps and make sure the circulation starts before the PC powers up.  ;)  Good stuff none the less.
GodSin:
when I finiahed my CP I had a few arcade buttons left over so I just used them for the power and reset button :)

figured what the hell ... beats spending more cash on a stupid switch from the Over Priced Radio Shack :)
Navigation
Message Index
Previous page

Go to full version