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Old 10-19-2009, 11:07 AM
artoodeeto artoodeeto is offline
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Help newbie wiring questions

I'm fairly new to LEDs, at least as far as actually setting them up and wiring them myself. Hopefully this is the right place to post it. So here's what I'm doing, and what I need help with:

I'm custom building a model jawa sandcrawler computer case. I have 88 LEDs of the small yellow variety (2V each I think?), lighting up the case. The 20 LEDs in the cockpit section are running in 4 sets of 5 lights each, wired in series. The 4 sets themselves are wired in parallel. the rest of the lights in the case are wired in parallel: two strands of 20 lights, and one strand of 28 lights. Each strand is hooked up to an individual rheostat, actually a Zalman fan speed controller. For the most part this setup works, but recently I plugged the lights in through the Zalmans to the various fan headers on the motherboard, which supply about 12V, and one set of parallel lights fried, I'm not sure why. The Zalmans have worked reliably up til now to bring the voltage down to something that the LEDs can handle, but given how much of a pain it is to rewire, I need something more reliable. So....

Any recommendations on how I should at least re-wire the ones I just fried? This includes advice on what gauge wire to use, I've been using a gauge that I suspect is too thick. I have 5 available fan headers that put out about 12V each (probably a little less), although I'd prefer to use as few as possible - if there was a way to wire all 88 together and plug them into 1 fan header, that'd be perfect. But, I know that wiring more than a few lights purely in series kicks the voltage per light down so much that they're very dim, and I'd like them as bright as possible. Thanks in advance!
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Old 10-20-2009, 04:11 PM
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Ken_McE Ken_McE is offline
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Default Re: newbie wiring questions

I'm custom building a model jawa sandcrawler computer case.

We want piccies.


Any recommendations on how I should... re-wire the ones I just fried?

Try stopping by: http://www.gizmology.net/LEDs.htm/ and scroll down to "Using LEDs"


This includes advice on what gauge wire to use, I've been using a gauge that I suspect is too thick.


LEDs don't need much wire, because they're not pulling much power, but you will hurt nothing whatsoever by using heavier wires.


I know that wiring more than a few lights purely in series kicks the voltage per light down so much that they're very dim, and I'd like them as bright as possible.

I would like to suggest you consider a current regulated power supply. As you have found, voltage is a good rough guide to powering LEDs. The LEDs however are exquisitely current sensitive. What seems like a small change in voltage, maybe a one volt difference, can run the full range from wimpy-dim-underdriven, through full power, and up into overdriven before you know it. You may also find it helpful to check up on the exact specs for your LEDs so you know the maximum safe level to drive them at.


I have listed a few possible suppliers below.


http://ledsupply.com/led-drivers.php

http://www.leddynamics.com/LuxDrive/drivers.php

http://www.superbrightleds.com/hobby.htm

http://theledguy.chainreactionweb.com/index.php

Last edited by Ken_McE; 10-20-2009 at 07:01 PM.
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