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Led help

X

Xandas

n00b
Joined
Feb 29, 2004
Messages
45
Ok I have 6- 2.0 V 20mA LEDS..
I want to put them on my computer's Power supply and I was thinking if I combine all them with electrical tape.. then run a wire from the normal connector in the Yellow and Black Slot.. that Would light them correctly?
 
Originally posted by alphanumeric
If you wire them all in series and get the polarities correct it will work.
Click to expand...
i think u gotta do it in parallel

remember to use a resistor...i learned it the hard way....trying to put two 2.5v leds on a 5v coming from my keyboard

bzzz...gone
 
Just remember that if you wire them in series, you might not get the full voltage to the LEDs further down the line, due to the foward voltage drop and internal resistance of the LEDs. You might be better off wiring them in parallel. just a thought.MIke
 
How many should I re-lay to one Connector? they at 2V each.. also I have resistors but they are like 420 OHMS... How should I connect to the powersupply? help :)
 
Originally posted by Xandas
How many should I re-lay to one Connector? they at 2V each.. also I have resistors but they are like 420 OHMS... How should I connect to the powersupply? help :)
Click to expand...
take all the positive leads from all the leds and solder or wire them together... do the same for negative leads... that way you have combined 6 positive inputs and 6 negative outputs to only one positive input and one negative outputs

that will give you a device that takes 12v... you can use a very very small resistor with it

however, if you're not willing to use all 6 LEDs, then you definitely need a resistor.... lets say you're using one LED thats 2v... then you get a 560 ohms resistor to drop the voltage down
use this to tell you which resistor to use

by the way lets say you somehow need a 840 ohms resistor but only have 420 ohms type... you can take two of them and connect them together to combine to 840

correct me if i m wrong*
 
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