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How To Wire Leds:


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#1 liquid-core

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Posted 18 June 2006 - 09:46 PM

Several people on these forums ask “How do I wire LEDs?” I decided I would write a brief tutorial so they will understand how to wire and the different methods of wiring. I will also explain the resistor calculator because it seems some people don’t understand how to use it. Let’s begin with the various wiring methods.

There are three different wiring methods. These methods are single (for one LED), series (for multiple LEDs) and parallel (for multiple LEDs). I am only going to talk about series and parallel circuits.

SERIES

When wiring in series the voltage of the source is dispersed equally throughout all of the LEDs. In order to find out how much power will be going to each LED you divide the voltage of the source by the number of LEDs. In a hypothetical situation, we have a 12V source and 6 LEDs (each requiring 2V to run off of). Divide the voltage source by the number of LEDs and you will get 2V, which means that 2V will be going to each LED. Great, each LED works perfectly and has the required voltage needed to run.

What happens when you have 3 LEDs (requiring 3.7V to run) and a 12V source? You will have too much power going to each LED. Divide 12V by 3 (LEDs) and you will get 4V going to each LED. Because there will be to much power going to each LED you will most likely smell something burning and will have to go out to buy a new LED. To fix this problem a little thing called a resistor was invented. A resistor is a “circuit component which offers resistance to the flow of electric current. A resistor also has a powerhandling rating measured in watts, which indicates the amount of power which can safely be dissipated as heat by the resistor.” In order to figure out what kind of resistor you will need you will need to know several things about the LED and the voltage source:

A) What is the voltage of the power source?
B) How many LEDs will you be wiring?
C) What wiring method will you be using?
D) What is the voltage drop of the LED (How much power does it take to run it)?
E) What is the recommended milliamps (mA)?

Once you know these things you will be able to use a resistor calculator to calculate the resistor that you need (I will go into more detail about this later).

When wiring LEDs together in series you wire from the - leg on one LED to + leg on another (the longer leg on the LED is the + leg). Here is a diagram courtesy of LsDiodes that will clarify what I am trying to say.
IPB Image
If you place an LED backwards nothing bad will happen. The LEDs just won’t turn on. If you need resistor wire this into the circuit before the LEDs. Wire to your power source and a ground to finish up your circuit. Now your circuit is complete and your LEDs will work just fine. I would recommend using electrical tape or shrink tubing to put around your soldering joints to prevent a short.

PARALLEL

Now on to a parallel circuit! A parallel circuit allows you freedom when choosing how many LEDs you would like to wire. Many people wire in parallel because of this “freedom”. This kind of circuit works great if you have a small voltage source and need multiple LEDs. If you had a 5V source and wanted to wire 3 LEDs (requiring 2V to run off of) there wouldn’t be enough power to power your LEDs. That’s true with a series circuit, not so with parallel. A parallel circuit works like so: “while every LED receives the same amount of voltage, the current of the source is dispersed between the LEDs.” What this is saying is that you will draw more power from you source. When wiring to a point on the XBOX 360 this won’t be an issue, only if you were getting your power from batteries or a similar power source that couldn’t replenish itself would you possibly need to consider this.

Because parallel doesn’t have any tricks for finding out how many volts is going through each LED I am going to skip to how to wire it. When wiring in parallel you always need a resistor. When wiring in parallel you wire the + legs together and the – legs together. Here is another diagram courtesy of LsDiodes.
IPB Image


RESISTOR CALCULATOR

Now that you know about the various wiring methods I am going to talk about resistor calculators. In order to use a resistor calculator you need to know several things (I mentioned these above but here they are again):

A) What is the voltage of the power source?
B) How many LEDs will you be wiring?
C) What wiring method will you be using?
D) What is the voltage drop of the LED (How much power does it take to run it)?
E) What are the recommended milliamps (the desired current)?

Do you know this information? If so lets move on. I am going to be explaining everything from here on, based on this particular resistor calculator. Find on the page the wiring method that you will be using (series is in the middle and parallel is towards the bottom). Enter in the information that it asks (that would be my A,B,D,E). Double check the information that you have entered and hit “Click to Calculate”.

The information that you are looking for is this, the “Nearest higher rated 10% resistor” and also “Calculated Resistor Wattage” and “Safe pick is a resistor with power rating of”. When purchasing a resistor I look for a resistor that has an ohmage of the “Nearest higher rated resistor” and a wattage between the “Calculated Resistor Wattage” and the “Safe pick”.

That concludes my tutorial. If you have questions please feel free to ask.

Pictures from LSDiodes.com
Other reference sites used: connectors.tycoelectronics.com/glossary/glossary-r.stm
Resistor Calculator: http://metku.net/ind...dcalc/index_eng

O’Malley

Edited by G0t M4xx 21, 13 August 2006 - 04:17 AM.


#2 sicknasty413

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Posted 18 June 2006 - 09:50 PM

hahaha i love how you said a BRIEF tutorial. lol.

Anyways, awesome tut. Im sure this will help tons of people.

This deffinetly deserves to be pinned.. woot woot!!

#3 snow rider221

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Posted 18 June 2006 - 09:57 PM

Great turorial, and SickMod's resistor calc. is easier to use for our purposes IMO, so here ya go everyone!

http://sickmods.net/...te=resistorcalc


Pin this !

#4 liquid-core

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Posted 19 June 2006 - 02:56 AM

@ Snow rider: The resistor calculator that you recommended is easier to use. Thanks for the link.

For people who would like a basic resistor calculator I would recommend the one mentioned by Snowrider.

Thanks for the comments everyone.

O'Malley

#5 Arjun

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Posted 19 June 2006 - 03:32 AM

Dude, those are some funky ass LEDs! I love it!

#6 snow rider221

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Posted 19 June 2006 - 04:03 AM

QUOTE(Arjun @ Jun 19 2006, 03:39 AM) View Post

Dude, those are some funky ass LEDs! I love it!



they look like thse binky-things that babies suck on

#7 manhunt009

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Posted 19 June 2006 - 03:29 PM

nice tutorial.

#8 Chancer

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Posted 19 June 2006 - 07:38 PM

I have added to the pinned thread.

#9 [-elmo-]

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Posted 20 June 2006 - 12:56 AM

nice tut. great pics from lsdiodes.

#10 xboxexpert

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Posted 20 June 2006 - 01:07 AM

Added to Tutorial Thread under Case mods.

#11 liquid-core

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Posted 20 June 2006 - 02:20 AM

Thanks for adding it to the tuts area and for pinning it. Glad everyone likes it.

O'Mallley

#12 GSX

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Posted 20 June 2006 - 02:42 AM

Praise the lord!!! Maybe now I won't get pm's ever day asking"which resistor do I use in the hdd ".... laugh.gif Sorry to everyone that asked, but its true.

#13 Chancer

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Posted 20 June 2006 - 04:28 PM

QUOTE(xboxexpert @ Jun 20 2006, 01:14 AM) View Post

Added to Tutorial Thread under Case mods.

HeHe Already added. See my earlier post smile.gif

#14 robivy64

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Posted 20 June 2006 - 05:57 PM

Great tutorial! Thanks for taking the time to write it.

-R

#15 WAMMADBADGER

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Posted 30 June 2006 - 08:15 PM

Very cool looking indead, im going to attempt to try it myself but i don't know much about this type of thing, it shouldn't be to tough to figure out, but i need the LED lights, what type is used here and where should i get them from? i did a quick search on the net and found 3mm blue led lights (quantity of 6) for 11.10. can you help me out with the lights?




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