Nick2618

I went out and bought some LED lights at radio shack to play around with. But when i connect them to a 9v battery the will turn on bright for a couple of seconds then fade and burn out. It seems to me that to much power is getting to the lite and killing? Any help would be great. Thanks

mattnin

Place a 10k ohm resistor in series and that will stop it from burning out.

Nick2618

What dose in series mean? Sorry.

Nick2618

I assume this [link=http://resistor]http://www.radioshack.com/product/index.jsp?productId=2062347&cp=&sr=1&origkw=10k+oh m+resistor&kw=10k+ohm+resistor&parentPage=search[/link] would work? Just how do i wire it exactly would i do it if i used 1 9v battery with a red and black wire comming out and then 4 small led lights.

THanks

Nick

paintstikker

That 9v is way too much for those LEDs. I believe that the LEDs from Radioshack handle up to 4 volts; which is what most LEDs can.

There are two ways to do this; series or parallel. If you do it in series, each light connected to the other will be dimmer, because the one before that is drawing the power. If you do it by parallel, it should all be even, but not as bright as possible. If you do it by series, you run 1 resistor; if you run it by parallel, you run a resistor to each LED. The parallel has more material, but the outcome will be the best.

Nick2618

So basically the resiator will bring the volts down so that i can use the 9v battery? Also the resiators i found above would work good?

Thanks for the help.

paintstikker

Yes, but that link brings me to wikipedia:
http://en.wikipedia.org/wiki/Resistor

Nick2618

try it now http://www.radioshack.com/product/in...entPage=search

paintstikker

Yeah 10k will work, I'm thinking that you can go a little lower, but I'm spacing on my electronics knowledge right now...

Here's a diagram I made; a bit rough but it should do. I'd rather use parallel so each LED gets the same amount of voltage, and not have each LED after the next be dimmer.

Nick2618

Alright Thanks for the help... I think i got it down. I will post more if i need some help or of some sort of finished product.

mattnin

He doesn't need a resistor for each LED in series. Yea, he can use less than a 10k, a 1k would do the trick too. You can wire it up like this:

Kevin.

use a 330 ohm resistor with a 9v

calvino

I use a 1k in series paralel with a square of lights for a different aplication and the time that I have run the LED's (white) for they are not warm at all. Just thought it would help. LED are the best for lights on an RC because they don't have a fillament that can burn out.

Nick2618

would these work?

Nick2618

Also i only need to use the resiators on the + right?

And what do i need for a 12v light? with 120 vac

mattnin

For the 120VAC you are going to need an AC to 12V DC converter

Nick2618

Think you could give me a link to one? I could not find it on radioshacks website.

Thanks

Kevin.

Actually you can put a resistor on either the negative, or positive side

alpattugay

Hi!
I am a technician and i make Light kits for every kind of RC. I can help to anyone