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Need led wiring help please

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psychobilly65

Joined: Nov 03 2007
Posts: 13


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Post Sat Nov 03, 2007 7:17 am

You guys really look like you know what you are talking about. This is not for an automotive project, it is for my fish tank(can't find help anywhere else). A friend just gave me a do it yourself moonlight kit with no instructions. The kit contains a 4 volt power supply hooked to 7 blue LEDs all postitives are hooked together and all negatives together (parralel I think) also the kit has 7 resistors that need to be hooked up. The resistor color bands are red, red, black then a space then a gold stripe. I went to one calculator and it said to put the resistors on the negative side and someone else told me the go on the positive side. Any help would be greatly appreciated!!!
alkatmsu

Joined: Nov 08 2005
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Post Sat Nov 03, 2007 8:19 am

Check out the LED wiring diagrams in http://www.oznium.com/forum/topic20 that thread, and see if it helps. I don't think it matters which side of the LED you put the resistor on, as long as you're consistent. I always put it on the positive side. I find it odd that the LEDs positive and negatives are already hooked up, but they didn't put in the resistors. Could you get us a picture of what you have?
PwrRngr

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Post Sat Nov 03, 2007 9:00 am

It doesn't matter which side you hook the resistor to. Just connect a resistor to one side of the bundle of LEDs. With only a 4 volt power supply you could get away without resistors (4V is the max for blue LEDs).
alkatmsu

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Post Sat Nov 03, 2007 9:11 am

Does that apply for any blue led, or just oz ones? Wouldn't want him to burn his out.
PwrRngr

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Post Sat Nov 03, 2007 10:24 am

It's pretty standard for blue LEDs. Some won't be that way but most are. Hook a resistor in series with the bundle of LEDs if you want to be safe.
psychobilly65

Joined: Nov 03 2007
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Post Sat Nov 03, 2007 5:19 pm

Wow cool didn't think I would get this much help, you guys are great. I can get a picture but I am not sure how to attach it.
banned from SG

Joined: Jul 01 2003
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Post Sat Nov 03, 2007 6:17 pm

It's easy. Upload it somewhere like www.tinypic.com and it'll give you all sorts of formats to upload with. You'll want the ones with the [img] and [/img] tags around it. (example)

User posted image
Then just paste into Quick Reply box
psychobilly65

Joined: Nov 03 2007
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Post Sat Nov 03, 2007 7:31 pm

Ok here goes my first try. Bare with me, not sure if the photos will help much. I tried them without the resistors and fried them. I have four more LED's left that I am going to hook a resistor to each positive lead of the diode then to the positive from the power supply.
IMG]http://i77.photobucket.com/albums/j74/psychobilly65/leds002.jpg[/IMG]
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mx107marlin

Joined: Aug 12 2007
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Post Sat Nov 03, 2007 7:41 pm

Very close...

Missed the first bracket on the first img code tag....

Try reposting the other 2, they should work, just try them again.
psychobilly65

Joined: Nov 03 2007
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Post Sat Nov 03, 2007 7:50 pm

Maybe this time
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mx107marlin

Joined: Aug 12 2007
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Post Sat Nov 03, 2007 7:53 pm

got it, now what is it of?

And don't dare say LED biglaugh.gif
psychobilly65

Joined: Nov 03 2007
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Post Sat Nov 03, 2007 7:54 pm

Here is a bad pic of the power supply

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mx107marlin

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Post Sat Nov 03, 2007 7:55 pm

How about one of the WHOLE thing....
psychobilly65

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Post Sat Nov 03, 2007 7:58 pm

A friend just gave me a do it yourself moonlight kit with no instructions. The kit contains a 4 volt power supply hooked to 7 blue LEDs all postitives are hooked together and all negatives together (parralel I think) also the kit has 7 resistors that need to be hooked up.

this is just a pic of one of the diodes my question was how to hook up the resistors which are color striped red,red,black with a gold stripe
psychobilly65

Joined: Nov 03 2007
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Post Sat Nov 03, 2007 8:02 pm

ok let me try it is pretty long if it helps until I get it the wire come off of the power supply positve goes to the first led then back out to the next and same with negative. The power supply is rated at 4 volt 700ma. I have no info on the led's themselvs. let me go try to take a pic.

By the way thank you very much for your time and help!
mx107marlin

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Post Sat Nov 03, 2007 8:11 pm

No problem on the pic, I'm pretty sure with them wired that way that you can take one of the resistors and connect it between the power supply and the positive wire that goes to the LED's

There isn't a positive and negative to the resistors, they'll work either way.
psychobilly65

Joined: Nov 03 2007
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Post Sat Nov 03, 2007 8:17 pm

ok got some pics. now let me see if I have this clear. I am now going to try 4 led's with the same power supply. So I can run a positive wire to all the positives and a negative to all the negatives with only one resistor between the power supply and the first led on the positive side.
psychobilly65

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Post Sat Nov 03, 2007 8:19 pm

IMG]http://i77.photobucket.com/albums/j74/psychobilly65/leds001.jpg[/IMG]

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psychobilly65

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Post Sat Nov 03, 2007 8:20 pm

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psychobilly65

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Post Sat Nov 03, 2007 8:21 pm

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psychobilly65

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Post Sat Nov 03, 2007 8:21 pm

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psychobilly65

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Post Sat Nov 03, 2007 8:22 pm

Wow the one before the last got me dizzy
mx107marlin

Joined: Aug 12 2007
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Post Sat Nov 03, 2007 8:48 pm

Yeah, I think you can do like I said..

Insert a resistor somewhere in the red wire before it hits the first LED

Maybe PwrRngr can back me up for that, but I'm about 90 percent sure that will work.
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Post Mon Nov 05, 2007 5:52 pm

Wow, that looks like a hack job if i've ever seen one
Floyd

Joined: Jul 23 2004
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Post Tue Nov 06, 2007 11:16 am

banned from SG wrote:
Wow, that looks like a hack job if i've ever seen one


Worse than a hack job... Using the wrong butts, and even then Id solder them and heatshrink them anyways.
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