Got to solder in a large quantity of LED's and they come with a pack of resistors, so I can feed them off a 12v supply. My question is can I just use the 1 resistor on the main feed wire or do I have to use 1 resistor per LED? Will it effect brighness?

 

Cheers

 

Vijay

Vijay .. u will only need 3 leds in series .. this will give 4v to each LED .. no resistors needed

 

No, MAX 2.3v forward voltage per led! ;)

No, MAX 2.3v forward voltage per led! ;)

 

*****x .. that'l teach me to "flick read through " :xxx: :smash: :tongue: :dance:

..

200 Ohm for each row of 5 wired in series :) When the car is running the battery voltage is 14v, so 4 Volt drop required @ 20mA

 

4/0.02=200

 

:)

 

 

At no point did he say this was running from a car -he said a 12v supply ! ;)

sorry, it is from a car and thanks to everyone :)

you're all a bunch of geeks :x:

you're all a bunch of geeks :x:

 

Says the "man" in a bungle outfit :x: :rofl: ;)

Says the "man" in a bungle outfit :x: :rofl: ;)

 

roflpmsl :rofl:

Missed this thread yesterday, send me a PM with what you are planning and i'l let you know what to do. :)

OK, back to this again. What size resistor would I need if I had 4 of these LED's in series and 3 LED's in series?

 

Cheers

 

Vijay

OK, back to this again. What size resistor would I need if I had 4 of these LED's in series and 3 LED's in series?

 

Cheers

 

Vijay

 

 

3 LED needs 415 ohm so nearest available is 470ohm

4 LED needs 320ohm so neerest available is 330ohm

 

1/4 watt should do

thanks bud :)