[pure-silver] Re: Ilford Multigrade

On Monday 22 August 2005 09:56, Sauerwald Mark wrote:
> >     Plus I think the LEDs are 12v? So no need for a
> > fancy power supply. Could
> > just use a battery.
>
> LEDs are current devices, so the voltage drop across
> them varies depending on the output - usually about
> 2V.  If you are going to use a battery, you need to
> put a current limiting resistor in series.


http://led.linear1.org/led.wiz

There is that web page for calculating the resistor. It would seem easy enough 
to do. I'm just hoping the price of LEDs drop some more -)

Nick
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