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100ohm Resistors Instead Of 50ohm


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#1 P.DOT

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Posted 10 April 2006 - 03:49 AM

Ok when I should be using 50ohm resistors how much dimmer would the light be if I used 100ohm resistors they are 5,000mcd 3mm blue led's. I Can buy some 50ohm resistors but I already have some 100ohm ones and wanna know if it is worth it. Thanks.

#2 pimpmaul69

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Posted 10 April 2006 - 04:10 AM

your supposedto use a 100 ohm resistor.. where did you get using a 50 ohm resistor

#3 P.DOT

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Posted 10 April 2006 - 04:15 AM

No the reverse of that I am suppose to use a 50ohm but I have a bunch of 100ohm laying around how dim will they mkae the light?

#4 pimpmaul69

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Posted 10 April 2006 - 04:21 AM

no... you are supposed to use 100 ohm resistors in the xbox.. otherwise your asking a question on the wrong forums site

#5 Shadow3223

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Posted 10 April 2006 - 04:22 AM

There really is no difference in brightness. Instead if you use a 50 ohm resistor you could burn up your leds more easily. Use the 100 ohm resistors.

#6 SICKdimension

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Posted 10 April 2006 - 04:24 AM

Guys, if wiring two LEDs in parallel, you are supposed to use 50 ohms, not 100 ohms. If you do use 100 ohms, they will still be bright. You probably won't notice a difference.

#7 pimpmaul69

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Posted 10 April 2006 - 04:26 AM

parallel... dont you mean series...what good would it be doing it in parallel and unless your doin 12v why would you run them in series

Edited by pimpmaul69, 10 April 2006 - 04:28 AM.


#8 trost

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Posted 10 April 2006 - 04:49 AM

well to answer your question...no you wont notice a difference If I where you i would just use the 100 ohm ones

#9 Slacker Master

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Posted 10 April 2006 - 06:20 AM

Damn guys, I think everyone is missing it here. You use the 100ohm resistors when you're using a resistor for every LED used, wiring a resistor to each LED. When wired together, in parallel, you no longer use the 100ohm resistor you would use for just one LED.

To answer your question, no, it won't make it much dimmer at all, you probably wouldn't even notice a difference when using the 100ohm instead of the 50ohm.

#10 SICKdimension

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Posted 10 April 2006 - 06:20 AM

QUOTE(pimpmaul69 @ Apr 9 2006, 07:33 PM) View Post

parallel... dont you mean series...what good would it be doing it in parallel and unless your doin 12v why would you run them in series

By wiring in parallel, you can use one resistor instead of several. That's the advantage.

Also, for future reference, I am only saying you can use the 100 ohm in this scenario of 2 LEDs in parallel. If you had 10 LEDs in parallel, you would fry a 100ohm 1/4watt resistor.

Edited by SICKdimension, 10 April 2006 - 06:24 AM.


#11 pimpmaul69

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Posted 10 April 2006 - 07:47 AM

QUOTE(SICKdimension @ Apr 10 2006, 06:27 AM) View Post

By wiring in parallel, you can use one resistor instead of several. That's the advantage.

Also, for future reference, I am only saying you can use the 100 ohm in this scenario of 2 LEDs in parallel. If you had 10 LEDs in parallel, you would fry a 100ohm 1/4watt resistor.

i wouldnt use a 1/4 watt resistor on leds anyways.. now i am still failing to understand why you would use a 50 ohm resistor.. to drop the voltage correctly on one or even 500 leds in parallel you would use a 100 ohm resistor.. now of coarse you cant run 500 leds on a little resistor just making a point.. now i could be wrong but i know enough about electricity to feel i am right

Edited by pimpmaul69, 10 April 2006 - 07:50 AM.


#12 SICKdimension

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Posted 10 April 2006 - 08:21 AM

QUOTE(pimpmaul69 @ Apr 9 2006, 10:54 PM) View Post

to drop the voltage correctly on one or even 500 leds in parallel you would use a 100 ohm resistor

First, resistors resist current, not voltage. The more LEDs in a circuit, the more current it requires and the lower the resistor rating you need. If you have 10 LEDs in a parallel circuit, the resistor rating will be lower than if you just have one or two.

If you are wiring one resistor PER LED, then you would use a 100 ohm resistor for each LED, but in a parallel circuit, with one resistor for multiple LEDs, you need to calculate which resistor will provide a safe current, while still giving the LEDs their full brightness. The wattage of the resistor also needs to increase, depending on the load running through it. 1/4 watt is OK for a couple LEDs.

#13 pimpmaul69

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Posted 10 April 2006 - 10:37 AM

ok kewl




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