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computer case LED's 

 

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 Post subject: computer case LED's
Posted: Fri Jun 24, 2011 8:11 pm 
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hey, I want to use 2 of the LED's from a PC case in my EF to light some stuff up (not sure what yet lol), I have the LED's and the wires, but I'm not sure what type of resistor (if any) I will need to make them work properley from 12V. I am not sure the rating of the LED's, as I just pulled them out of a PC case. Is there any type of resistor I can just "try" with them? Can I pull the resistors out of any old junked electronics? Because I want to do all of this with what I have here ideally, without buying anything.

Gab
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 Post subject: Re: computer case LED's
Posted: Fri Jun 24, 2011 8:21 pm 
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If they are from a PC, they will either be 12v or 5v. Most likely the former. I never got in to Desktop computers (always had laptops), so I haven't tried myself.

If they are already 12V, chop the plug off the end, and splice into the car :wink:

 

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 Post subject: Re: computer case LED's
Posted: Fri Jun 24, 2011 9:13 pm 
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how would I find out without blowing them up? lol

Gab
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 Post subject: Re: computer case LED's
Posted: Fri Jun 24, 2011 11:10 pm 
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multimeter in the power supply terminal, or ask someone on a computer forum

 

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 Post subject: Re: computer case LED's
Posted: Fri Jun 24, 2011 11:57 pm 
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if you have unknown LED's, hook them up to a potentiometer (slot car hand controller, volume knob out of an old radio etc.) then start feeding in power with a high resistance - you should get a dull glow first then work up till you get a normal light level. At this point, measure the resistance at the potentiometer using a multimeter then you should end up with a figure in ohms. Then you can either start measuring the ohms in old junk resistors looking for something similar - or bite the bullet and go to Jaycar where you'll drop maybe 15c on a new resistor...come to that, you can buy the LED's brand new for next to nothing and the Jaycar guys will even tell you what resistor to use with it...

 

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 Post subject: Re: computer case LED's
Posted: Sat Jun 25, 2011 12:19 am 
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alright well I found a big resistor in an old Radio, i dont really know what it's value is, but it has 1 fat gold band, followed by a brown, and 2 orange bands, the reistor is pretty fat and it's blue in colour, it seems to work when I connect the LED's to it, eithier singally, in parralell or in series, it seems to work alright no matter which way I connect em, so I think the problem is solved.

Cheers, Gab
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 Post subject: Re: computer case LED's
Posted: Sat Jun 25, 2011 1:23 am 
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f**k to think I used to know so mch of this stu, like I used to know how to read the bads of rsistors, real simple s**t really, but stil, the amount you forget when yu obn't use it.

 

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 Post subject: Re: computer case LED's
Posted: Sat Jun 25, 2011 2:42 am 
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What colour was the wires on the socket if it's plugged in a standard 4 pin power plug it will be the following

Quote:
Pin # Color Function
1 Yellow +12 V
2 Black Ground
3 Black Ground
4 Red +5 V


I used Google and Wikipedia but I did know the colours and voltage but was not sure which way around it was :roll:
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 Post subject: Re: computer case LED's
Posted: Sat Jun 25, 2011 3:37 am 
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LP_ wrote:
What colour was the wires on the socket if it's plugged in a standard 4 pin power plug it will be the following

Quote:
Pin # Color Function
1 Yellow +12 V
2 Black Ground
3 Black Ground
4 Red +5 V


I used Google and Wikipedia but I did know the colours and voltage but was not sure which way around it was :roll:


Lol, they were GREEN and WHITE wires, but with a big resistor out of an old amp, it seemed to work fine. Shame I cant find em now, lol

Gab
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