[Noisebridge-discuss] LED Calculations help

jim jim at systemateka.com
Mon May 21 07:48:59 PDT 2012



    What kind of LEDs? Different types have differing 
voltage drops and current ranges. 



On Sun, 2012-05-20 at 22:16 -0700, Phil Spitler wrote:
> Hi,
> For simple LED projects, I usually use an online LED calculator to get
> the values for the needed resistors.
> 
> 
> I have just ordered some LEDs online but the specifications don't list
> the forward voltage, just the current draw.
> 
> 
> http://www.adafruit.com/products/679
> 
> 
> How would I figure out how to power the LEDs and what resistors to
> use?
> 
> 
> I am thinking of using 10 LEDs and having them all powered, all the
> time.
> 
> 
> I would love to know how to calculate my needs.
> 
> 
> Any ideas?
> 
> 
> Cheers.
> 
> 
> Phil
> 
> 
> 
> 
> 
> Phil Spitler |   Associate Creative Director  |  Bonfire Labs |  t :
> 415.394.8200  |  c : 415.571.3139  |  Bonfirelabs.com
> 
> 
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> 
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