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| Gab1 |
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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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| Ballast |
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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 
_________________ Remember kids, the more pages of crap in your build thread, the bigger your e-penis is |
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| Gab1 |
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how would I find out without blowing them up? lol
Gab |
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| Ballast |
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multimeter in the power supply terminal, or ask someone on a computer forum
_________________ Remember kids, the more pages of crap in your build thread, the bigger your e-penis is |
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| tearlejc |
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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...
_________________ 351 4V XB Coupe running LPG |
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| Gab1 |
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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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| OZBMX |
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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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| LP_ |
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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 
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| Gab1 |
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{USERNAME} 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 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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