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Author Topic: what resistor to use  (Read 2103 times)

Offline atomicareprise

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what resistor to use
« on: December 19, 2009, 05:19:40 AM »
hey guys...before anything let me be the first to greet all of you guys an advance merry christmas... :cool:

now my question is that i'm wonderin' what resistor should i use if my led was powered by a 12v...

the led i'm using is from a motorcycle...and it has 12v supply..

now i want to hook it up using a 3.6v

TIA :drunk:
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Offline Jumbo

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Re: what resistor to use
« Reply #1 on: December 19, 2009, 07:21:57 AM »
What voltage does it require?.......
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Offline atomicareprise

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Re: what resistor to use
« Reply #2 on: December 19, 2009, 07:50:58 AM »
well the led is from a motorcycle and led was supplied by a 12v battery..

now i want to use the led using a power supply of 3.6v...

is that possible?
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Offline atomicareprise

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Re: what resistor to use
« Reply #3 on: December 27, 2009, 02:45:49 AM »
bumping my question guys.. :tup:
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Offline pigoesfar

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Re: what resistor to use
« Reply #4 on: December 27, 2009, 07:31:17 PM »
I doubt that the LED can use a 12v power source without there being a resistor already.  The standard voltage for a white and blue led are about 3.3v to 3.6v so find out the required minimum voltage as well as the mA required and plug it into a resistor calculator.
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Offline atomicareprise

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Re: what resistor to use
« Reply #5 on: December 27, 2009, 10:25:03 PM »
i'll upload a pic later...its a 3mm led..i dont see a motorcycle that have a power source lower than 12v..

maybe the led itself has resistors built in...maybe..
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Offline pigoesfar

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Re: what resistor to use
« Reply #6 on: December 28, 2009, 03:58:13 PM »
where exactly did this come from on a motorcycle?  If it was from a lamp on the front or something I'm sure that it connects to a circuit board somewhere where the voltage is either lowered or there is a resistor.  Also, what kind of power supply are you hooking it up to?
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Offline atomicareprise

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Re: what resistor to use
« Reply #7 on: December 28, 2009, 04:24:46 PM »
well the led is actually bought separately for the accessories for the motorcycle...

the led is hook up to a 12v battery..
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Offline pigoesfar

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Re: what resistor to use
« Reply #8 on: December 28, 2009, 08:24:42 PM »
What color is it?  If you can find the info on the package see what voltage it needs at a minimum to work and what mA it takes.  honestly, if it is just a standard 3mm led  just go by the standard guidelines...   For white, it's from 3.3v to 3.6v.  Blue is like 2.5v to like 3.0v.  This is all from memory.  I would look them up or try to find it out by doing some experiments with your voltmeter.  When guessing just going with the higher resistor value.
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Offline atomicareprise

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Re: what resistor to use
« Reply #9 on: December 28, 2009, 08:43:40 PM »
i'll do that buddy..

thanks
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Offline pigoesfar

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Re: what resistor to use
« Reply #10 on: December 28, 2009, 09:50:22 PM »
BTW, I'm going to be skiing all day from here on until sunday so I can only really respond in the afternoon...   
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