[pure-silver] Re: Ilford Multigrade


> 
>       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.




                
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