commonly it are these standard values, multiplied with factor 1,10,100 ...

• 1
• 1,2
• 1,5
• 1,8
• 2,2
• 2,7
• 3,3
• 3,9
• 4,7
• 5,6
• 6,8
• 8,2

You can get more specific values, but they are more expensive (cfr . metal film resistors).

No you don't

It's always better to have a bit more resistance thus having a little bit less light output (not noticable imo)... always driving @ full speed is also not healty :super:

Could you add another option to the poll?
Because, you explained it well, but I already knew it so it wasn't interesting.

So, don't take that "No, this sux" vote as something negative :).

now stop whining, you li'l twit :grum:
j/k ;)

see Anthro's list below:

1.5+1.5+1.5= 4.5 (x100) Ohm

Is it possible to change the No this sux vote to It doesn't suck, ...
Thx :)

... cuz you've got such a pretty smile :o

Determinating Resistor Values
 

As an addition to Anthroplast's tutorial on how to calculate the resisitor value for led's, I'll explain here how to determinate what value a given resistor has.

First you take the resistor and look for the colorband closest to the side of the resistor (closest to the wire that comes out of it).

Now start writing down the color codes, starting with the first one (duh :)).

After that just do this:
let's say we have written down the following red-orange-green-gold.
Then our resistor value would be:
Red: 2
Orange: 3
Green:100K
Gold: 5%

The value then is: 23 * 100K = 2300K resistor with a tolerance of 5%.
This means the actual value can be anything within a range of 5% of 2300K.

There are also resistors with 5 colorbands. When you encounter one of these just place the digit of the first 3 bands after each other and then multiply with the 4th one, instead of with the 3rd one.
Example: red-orange-green-blue-gold
This would be:
Red: 2
Orange: 3
Green:5
Blue: 1M
Gold: 5%

So we get: 235 * 1M = 235M resistor with a tolerance of 5%.

I hope you all understand, if not, let me know and I'll make some pictures.

To make everything even more easy I made a program in VB last night, feel free to download.
It's in Dutch, but English users shouldn't have to much problems to understand it though.

Download.

OR: you don't download anything and use an html page to determine the resistance

http://webhome.idirect.com/~jadams/e...esist_calc.htm