Thanks, that's a good artcle on this topic! It says different LEDs gives
different votage levels. Even 1.5 V could be achived! Wich leads to another
silly question: do we have to protect the pin of the PIC if it was driven
directly in a normal LED flashing app? So I put the device under the
sunlight, the LED is not currently switched on so there will be a 1.5 on the
PICs pin (well it's not that much or is it?)

Tamas


On 11/22/06, William Chops Westfield <westfw@mac.com> wrote:
>
>
> On Nov 22, 2006, at 3:22 AM, Jinx wrote:
>
> > Pity the schematic text in this pdf is so blurry
> > http://www.edn.com/contents/images/92602di.pdf
> >
> Better versions here:
> http://www.edn.com/article/CA244149.html
>
> BillW
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