[Noisebridge-discuss] LED Calculations help

Nicholas Granado ngranado at gmail.com
Mon May 21 05:22:35 PDT 2012


hi phil,

that link states that the forward voltage is rated @ 3.4 volts with a 20ma
draw; however they can be powered at 3.0 volts with approx. 10ma draw.

nick



On Sun, May 20, 2012 at 10:16 PM, Phil Spitler <phil at bonfirelabs.com> 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<http://www.bonfirelabs.com/>
>
>
>
>
>
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>
>
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