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load resistors? 

 

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 Post subject: load resistors?
Posted: Wed Feb 23, 2011 2:39 pm 
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im putting clearance lights on my ute (led) i know i need a load resistor but if im running 10 in parallel will one resistor be enough?
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 Post subject: Re: load resistors?
Posted: Wed Feb 23, 2011 3:06 pm 
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Dont do it. Given the tiny cost of the resistors.

If you try running 10 from one if any one led dies the current will go up. You'll get a much more consistent result having a current limiting resistor on each light point
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 Post subject: Re: load resistors?
Posted: Wed Feb 23, 2011 3:17 pm 
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how much are they worth? ill be running two circuts of 10 lights, these are the type that ud buy by the 100 hey
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 Post subject: Re: load resistors?
Posted: Wed Feb 23, 2011 3:27 pm 
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Are your 10 lights close together? - Id assumed they werent.

If your LEDs are very closely matched you can do a few things - like run 3/4 in series with one resistor. If theyre in the same place.

If they arent matched a resistor for each is the go. Most places no more than 10c each or so. make sure you work out the correct current for your particular LED though. Formulas are on Jaycar web site I think.

Nigel
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 Post subject: Re: load resistors?
Posted: Wed Feb 23, 2011 3:43 pm 
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Ohms law is what you need to work it out yourself. R = (VS-Vf) / If
Where R = Resistance, VS = Source Voltage, Vf = Forward Voltage Drop (of LED) and If = Current Draw (of LED) in amps. Example R = (12 - 2.2) / 0.02 = 490ohmsR

Thanks to jaycar.

better off running them per led i think also. it's easier to work out a common value resistor and buy 100.

 

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 Post subject: Re: load resistors?
Posted: Wed Feb 23, 2011 3:54 pm 
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:shock: :shock: :shock: :shock: :shock: :shock: :shock: :shock: :shock:

say what! i think ill take one in and get the dude behind the counter to show me what i need
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