On Sat, 16 Jun 2001, Roman Black wrote:

> Vasile Surducan wrote:
> >
> > You can do this very easy, using only one three pins regulator ( like 7805
>
>
> Clever idea using a 3-pin regulator Vasile.
> Maybe go one step further and use a variable
> 3-pin device like a LM317K, you could use a couple
> of resistors and the one PIC pin could select
> regulated 7v, reg 12v and off. I don't think it
> would be hard, there would be almost zero parts
> count and full voltage regulation with short
> circuit protection built-in, all driven from
> one PIC pin.

  Absolutely ! But here, 317 for large currents ( 3 A package ) is hard to
find and using an external power transistor increase the cost of
final project. I have use many times lm317/lm337 and the romanian clones,
and I also like them.
Cheers, Vasile

P.S. one second error free, when ?

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