LED voltage?

kappage · Post by **kappage** » Fri Jun 01, 2007 2:25 am

Hello, i was given some LED rail thingy's its got on LED that shines light into a solid plastic tube looks cool on the portable H/D but how many volts are they? i was wondering this because i want to mount them im my case, their sweet they flash different colours!

Dragon_Cooler · Post by **Dragon_Cooler** » Fri Jun 01, 2007 5:58 am

Depending on the color will depend on the voltage, blue is usually a little higher around 3.2-3.4 volts.

If it is just one led you will need an inline 470ohm resistor.

This site is pretty helpful:
http://www.kpsec.freeuk.com/components/led.htm

just what ever you do dont hook the LED straight up without a resistor, if it doesnt already have one!!!

kappage · Post by **kappage** » Fri Jun 01, 2007 7:57 am

yea ive blown lots before i learnt their less them 12v then their less then 6v

Dragon_Cooler · Post by **Dragon_Cooler** » Fri Jun 01, 2007 3:37 pm

let me know if you need some resistors, i have tons for my LEDs fedish. prob just have you pay shipping or something, i know i wont use them all soon.

kappage · Post by **kappage** » Fri Jun 01, 2007 7:35 pm

yea about the shipping im in Australia!

Zertz · Post by **Zertz** » Fri Jun 01, 2007 7:37 pm

http://led.linear1.org/1led.wiz
http://led.linear1.org/led.wiz

kappage · Post by **kappage** » Mon Jun 04, 2007 3:16 am

Would it work to run 2 LEDS of six volts without them blowing out?

Zertz · Post by **Zertz** » Mon Jun 04, 2007 3:56 pm

If you run 2 LEDs without a resistor, you'll blow them because the current will be infinite since LEDs don't have an internal resistor.

LEDs need between 1.6V and 3.2V to run, depending on the color, but that's not really important since you'll be running on 12V.

Basically take your source voltage (12V) divide by 20mA (that's about the current a LED needs to produce decent lighting), so you'd need a 600 ohm (not sure if those exist, but I know for sure 680 exists and would work) resistor.

Also, I read you original post and the LED doesn't flash by itself, it's most likely controlled by a simple circuit.

Dragon_Cooler · Post by **Dragon_Cooler** » Mon Jun 04, 2007 8:24 pm

kappage wrote:yea about the shipping im in Australia!

WOW!!!

ummm i doubt you would want to pay for shipping to AUS for a 5 cent piece. LOL

kappage · Post by **kappage** » Wed Jun 06, 2007 2:10 am

i think it would be like $5 or somthing