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06-03-2006, 04:39 PM | #1 |
Drives: Blank Join Date: Feb 2006
Location: Not here
Posts: 74
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What size resistor?
Okay I have a 2.5v LED that I need to hook up, but i need to know what size resistor to use, ive google ive asked im confused.... PLEASE HELP!
Thanks, Rick! |
06-03-2006, 05:52 PM | #2 |
lil' town up north
Drives: 07 Yaris LB 5 speed Meteorite Join Date: Apr 2006
Location: Northern Vermont
Posts: 92
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use this to find out
http://ourworld.compuserve.com/homep...Bowden/led.htm v = volts mA = milliampere(Milliampere, an SI unit of electric current, worth 0.001 Amp) Ohm = electrical resistance or electrical impedance with 1 led, at 2.5v, a 15 mA current, and a 14.2v source(the alternator will push 14.2 volts), it says a 750 Ohm. I would use a resistor higher than that number. I personaly would just use a 1k (1000 Ohm) resistor that way your safe. Last edited by Leenis24; 06-03-2006 at 06:32 PM. |
06-04-2006, 02:25 AM | #3 |
Drives: 2007 Yaris S Join Date: May 2006
Location: Milwaukee WI
Posts: 582
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check this out http://led.linear1.org/led.wiz
very handy little helper when it comes to wiring LED's it will give values for resistors, and pratical array patterns if you are wiring multiple LED's it will even help you with resitor color codes, and give you a wire diagram for the layout :) |
06-04-2006, 08:02 AM | #4 |
lil' town up north
Drives: 07 Yaris LB 5 speed Meteorite Join Date: Apr 2006
Location: Northern Vermont
Posts: 92
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hey johnnyfive, that site is really cool, i bookmarked it.
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06-04-2006, 10:30 AM | #5 | |
Podiatrist
Drives: Turbo IS300 Join Date: May 2006
Location: MA
Posts: 83
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Quote:
A 1/4 watt resistor is plenty. If you go up in wattage it won't do anything...so if you can only find 1/2 watt it won't make a difference. If you are putting multiple LED's in...I suggest wiring them up in series (connect the + of one LED to the - on another and create a chain) because it seems easier than running them in parallel. What is your project? Pics? LED's rock |
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06-04-2006, 04:53 PM | #6 | |
Drives: Blank Join Date: Feb 2006
Location: Not here
Posts: 74
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Quote:
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06-07-2006, 01:33 AM | #7 |
Drives: 07 Civic Si Coupe(Black Pearl) Join Date: May 2006
Location: Chicago, IL
Posts: 159
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So you use hot glue to hold em in place? I was thinkin of tryin somehting like this. Bought some LED bulbs, they suck, not bright at all.
also, how many do you think it would take to look nice and bright? and take it the wider the angel the better? I was lookin at some of the 5 mm leds @ http://www.superbrightleds.com/leds.htm |
06-07-2006, 01:42 AM | #8 | |
Podiatrist
Drives: Turbo IS300 Join Date: May 2006
Location: MA
Posts: 83
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Quote:
I use superbrightleds.com LED's in 5mm. |
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06-07-2006, 03:13 PM | #9 |
Drives: 07 Civic Si Coupe(Black Pearl) Join Date: May 2006
Location: Chicago, IL
Posts: 159
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So how do you get em to stay in place?
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06-07-2006, 07:14 PM | #10 |
Podiatrist
Drives: Turbo IS300 Join Date: May 2006
Location: MA
Posts: 83
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Depending on the surface, you can buy LED surface mount holders.
Do a radio shack search or something. |
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