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Which resistors for this LED?

post #1 of 9
Thread Starter 
http://jab-tech.com/300MCD-5mm-UV-le...k-pr-2392.html

what resistor do I need for it?

also, if I were to hook up a few in parallel, does anyone know how to tell me what resistor I would put on the hot wire?
    
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post #2 of 9
provided you wire it to the +5V line; it has a forward voltage of 3.5V @ 20mA, so you need a resistor to drop the supply voltage by 1.5V; i.e. R = 1.5V/0.02A = 75 Ohm. If you want to use 1 resistor for multiple parallel LED, then divide 75 Ohm by the number of LEDs to get the necessary resistance.
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post #3 of 9
Thread Starter 
I just counted 8 LED lights so... 9.375ohm?

What kind of resisitor do i get?
    
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post #4 of 9
The most common kind of resistor is a carbon film resistor - they look like this and are what you would want for this project.

EDIT: Actually, I take that back. After some more math you'll want a 1w resistor - your total wattage will be .56w if you use a 10 ohm resistor, which is over the 1/2w rating of most carbon films. Radio Shack has some metal oxide 10ohm 1w resistors that will work well (assuming the 5v input that radodrill mentioned).
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by Chipp View Post
The most common kind of resistor is a carbon film resistor - they look like this and are what you would want for this project.
Sorry,


Which resistor value should I get? and what colors would it be?
    
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post #6 of 9
Use ledcalc.com

The forward voltage is 3.5v and current is 20mA

I did a small calculation for you If you hookup 5 LED's in parallel to a 12V source. You will need an 85 Ohm 1Watt resistor

OT : These LED's are expensive for 300mcd. mcd is the intensity of the LED's .
ebay has really cheap LED's their typical mcd is around 4000
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by wastedtime View Post
Use ledcalc.com

The forward voltage is 3.5v and current is 20mA

I did a small calculation for you If you hookup 5 LED's in parallel to a 12V source. You will need an 85 Ohm 1Watt resistor

OT : These LED's are expensive for 300mcd. mcd is the intensity of the LED's .
ebay has really cheap LED's their typical mcd is around 4000
I got em from somewhere else...

and I like parallel wiring, its easier for me.... and you calculated for 5 LED's which is useless because Im using 8 but thanks for link +1
    
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post #8 of 9
Thread Starter 


does this look right?
    
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post #9 of 9
use a 10 Ohm 1/2W resistor (total power dissipated is 0.24W so a 1/4W would probably work, but 1/2W is recommended); the color code for a 10 Ohm is Brown Black Black
Edited by radodrill - 7/25/08 at 8:35pm
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