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/diy/ - Do-It-Yourself - LED Control Module

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File: Led-Lights.jpg-(47 KB, 360x360)
LED Control Module
LED Control Module Anonymous 05/17/14(Sat)14:42 UTC+1 No.639471 Report

I am looking to add some LED lights to something. I am thinking a dozen or so. What is out there that i can plug some LEDs ito and provide power to them? I tried hacking up an old 9volt power supply but i think it burned the LED out almost immediately. Need something with a switch.
Anonymous 05/17/14(Sat)15:01 UTC+1 No.639475 Report

The simplest option is to use resistors to limit current. You can play with this: http://led.linear1.org/led.wiz
The LED voltage and current values depend on what you have, but you can start with 3.5V and 20mA.
Anonymous 05/17/14(Sat)15:07 UTC+1 No.639476 Report


use the led series and parallel calculator

it will show you how to wire it up and what size resistor to use.

see attached pic for an example. to add a switch just throw on in on the front or the end.
Anonymous 05/17/14(Sat)15:18 UTC+1 No.639478 Report

okay wow, i didnt realize it was this complicated. I Salvaged some LEDs from an old server case and have no clue what their forward voltage or anything like that is. Is there a drop in solution i could purchase? My google fu skills are prevailing today.q
Anonymous 05/17/14(Sat)15:36 UTC+1 No.639483 Report

to do it simple just add a resistor with the leds when plugging them into whatever power source you have. LEDs will pull more current then they can actually handle. you saw this when you plugged it straight into the 9 volt and it burnt out. A resistor just acts as a current limiter

if you don't want to do the math just guess, too high it will be really dim or not light up at all, too low it will burn out. just play with different values until you get somewhere comfortable.
Anonymous 05/17/14(Sat)20:00 UTC+1 No.639566 Report

Get a coin cell battery (there is probably one on that server mobo you snagged these out of.

Those have high internal resistance, so you can safely run an LED off of them without a current limiting resistor.

use that to check that the LED is working, and to figure out the polarity if the ends are snipped.
nooooo 05/18/14(Sun)00:24 UTC+1 No.639650 Report

Bro, yiu should always use a resistor with led. But, budget builds and only running 12, you shoukd be fine using any old togle switch and 3v lithium watch batteries from almost any store, walmart and dg have them. Some led only work with the right polarity, nif they dont turn on, switch yiur wires. Led have one long wire and one short one. Conect all short together and all long together. Connect one group of those to the battery. Connect the other to the switch. Conect the other side of switch to other side of battery. If they du
Ont turn on then flip the battery wires to tue other sides of the battery.
Anonymous 05/18/14(Sun)01:52 UTC+1 No.639677 Report

>Some led only work with the right polarity

ALL LEDs only work one way. They're inherently polarized devices. Short lead is negative, long is positive. Most, but not all, also have a flat ground onto the base to indicate the cathode (negative).


It's...really not complicated, especially if you aren't dealing with power LEDs and don't need exact numbers. Just stick each one in series with a 1k? resistor and hook each of those up to 9-12V.
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