Try an LM338 (replaces the LM317 and it handles 5 amps). It can surge to at least
7 amps and is in a TO220 package.  Check JDR. Price is under $2 in single
quantities.
Ron

Vasile Surducan wrote:

> 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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