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Author Topic: Led in this circuit  (Read 2321 times)

snowy

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Led in this circuit
« on: September 20, 2003, 05:22:08 AM »

Hi there,

 Ive been looking around for a key start mod for a while and finally found one : http://www.overclockers.com.au/article.php?id=132325&P=2

   I wanted to put an led in this curcuit so that when you turn the key, the led will go on. Would that be safe and where abouts in the circuit do you think I should put the led?
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Mr.Mysteriosity

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Led in this circuit
« Reply #1 on: September 20, 2003, 07:21:22 AM »

that would be a different circuit in a sense.

I would connect the LED to the key the same as you would the arm/disarm for the power switch, but the other part of the LED switch would connect to a Molex connector inside your case. Understand? I'm going to make some Diagrams in MS Paint and be right back.
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Mr.Mysteriosity

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Led in this circuit
« Reply #2 on: September 20, 2003, 07:33:23 AM »

I'm back with a diagram of my idea.

I've uploaded to the GT forum Photo Album. the image is pending approval.
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Skylined

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Led in this circuit
« Reply #3 on: September 20, 2003, 12:49:48 PM »

snowy: I think that is useless because when the PC is off and locked/not locked the led won't light up.
It will just light up when the PC is on.

You can also wait a lil bit until ed uploads my new guide that is an electronic lock.
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PetaHertz

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Led in this circuit
« Reply #4 on: September 20, 2003, 12:59:44 PM »

I'd put the LED in parallel with the power button (doesn't much matter where).  Don't forget a current limiting resistor, and get your polarity correct.

Though I do agree with Skylined.  If it's 'locked' then the computer off, no power = no LED anyways. When the computer is on, that means it's 'unlocked' and you have the regular power indicator that is on.  But if you just want it for more effects rather than function... I say go for it.
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viridius

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Led in this circuit
« Reply #5 on: September 20, 2003, 05:53:10 PM »

If you put it in parallel with the power button it will either turn the computer on because it will act as a low resistance path or not light up at all because there is too little voltage to run it.  Why don't you just run it off of a molex.  The 12 volt rail turns on the instant the power button is pushed.
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PetaHertz

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Led in this circuit
« Reply #6 on: September 21, 2003, 12:40:32 AM »

Oh yeah... the whole "complete circuit" thing.  Whoops.
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I LOVE ED

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Led in this circuit
« Reply #7 on: September 21, 2003, 02:06:31 AM »

power a LED from a USB port (5v) then turn on your PC.  if it's still lit, you can probably use your mobo's internal USB headers (if you have some) and power your LED from there (my mobo's USB is still powered when the PC is off).  Not sure if there's an SPDT type keyswitch though, trying to isolate the LED circuit part from the power switch part.
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strongShock

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Led in this circuit
« Reply #8 on: September 21, 2003, 03:05:39 PM »

snowy, it will be safe as long as you wire it right. :)

x24's idea may work if you set your bios to turn on USB device wake up. to be honest, i've never gotten 5VDC from my USB wires unless a device is on & activated.

if USB doesn't work for you, you could turn on WOL & hook up to your WOL header for up to .2A @ 5VDC.
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fuzzball172

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Led in this circuit
« Reply #9 on: September 22, 2003, 02:22:43 AM »

could u not take the 5v from your power button, but ground it on a molex, so as to not make the power button circuit and fire up the pc?
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