Green LED's -> what resistor ?

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katarakt
 
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Green LED's -> what resistor ?

Post by katarakt »

My first x0x seems to be finished in the next few weeks and i want to build the second x0x with complete green LED's but what resistor is best for green diffused LED's. I want to order them from mouser, someone know the mouser partnr. and what resistor?

niksun
 
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Re: Green LED's -> what resistor ?

Post by niksun »

See this post. But if you want green diffused resistors, what's wrong with these. Using Ohm's law, you technically only need ~140 Ohm resistors, but that's probably too low. A 1K should be fine. If you built the variable PSU along with the project, set it to 5V and hook up and LED with a 20K pot or so. Vary the pot so that the LED is at the intensity/brightness you want and then measure its resistance with a multimeter. Then get the closest valued resistor to this.

katarakt
 
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Re: Green LED's -> what resistor ?

Post by katarakt »

Hm, thanks so far...i've to look for a 10-20 kpot to try this but my hope was that someone's posting here who have done a x0x with green LED's. As i'm going to order all parts from mouser i'll order the green LED's from mouser too.

niksun
 
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Re: Green LED's -> what resistor ?

Post by niksun »

I say that 1K resistors should be fine.

katarakt
 
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Re: Green LED's -> what resistor ?

Post by katarakt »

ok thanks

zbr
 
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Re: Green LED's -> what resistor ?

Post by zbr »

for me 1k was a bit too much for green LED, I had to go around 400ohms to get healthy brightness (and I don't mean excessive brightness, just healthy). beware, same resistance for red burns it in a second

textile
 
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Re: Green LED's -> what resistor ?

Post by textile »

I use 470ohm with mine. 2mm green led diffused by Lumex .

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richms
 
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Re: Green LED's -> what resistor ?

Post by richms »

It will depend on the green LED - ickky lime green ones have a different Vf to the nice deep green ones.

But the deep green ones are much more efficiant than the lime green ones.

Trial is best IMO.

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