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INFO: Resistance for LED's / Determinating Resistor Values INFO: Resistance for LED's / Determinating Resistor Values
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INFO: Resistance for LED's / Determinating Resistor Values
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Old 10th June 2002, 17:22   #11
Anthroplast
 
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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).
 
Old 10th June 2002, 17:25   #12
Anthroplast
 
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Quote:
Originally posted by TeuS
I know, duron

my blue leds need 435 ohm resistors
nearest value: 470

=>NEED THOSE VALUES!
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
 
Old 10th June 2002, 23:00   #13
Devil_H@ck
 
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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 .
 
Old 10th June 2002, 23:21   #14
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now stop whining, you li'l twit :grum:
j/k
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Old 10th June 2002, 23:39   #15
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Quote:
Originally posted by TeuS
I know, duron

my blue leds need 435 ohm resistors
nearest value: 470

=>NEED THOSE VALUES!
see Anthro's list below:

1.5+1.5+1.5= 4.5 (x100) Ohm
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Old 11th June 2002, 13:29   #16
Devil_H@ck
 
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Is it possible to change the No this sux vote to It doesn't suck, ...
Thx
 
Old 11th June 2002, 14:21   #17
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... cuz you've got such a pretty smile
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Old 12th June 2002, 13:55   #18
Devil_H@ck
 
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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%.

Code:
Color Digit Multiplier Tolerance ---------------------------------------------------------------- Black 0 1 Brown 1 10 1% Red 2 100 2% Orange 3 1K Yellow 4 10K Green 5 100K Blue 6 1M Violet 7 Gray 8 White 9 Gold 5% Silver 10%
I hope you all understand, if not, let me know and I'll make some pictures.
 
Old 14th June 2002, 23:55   #19
Devil_H@ck
 
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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.
 
Old 15th June 2002, 07:49   #20
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OR: you don't download anything and use an html page to determine the resistance

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