7812 and 7805 for powering a stamp and 2 IC''s
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I'm not following you here. Are you pointing out to me that the 7805 doesn't
generate 12V (if so, I understand that). Tim's original post didn't give any
reason why 12V was needed, so I was wondering, out loud, why he needed the two
voltages?
He's since posted that he's using a 12V relay, so now the other voltage makes
more sense to me.
Kevin
Phil Keller wrote:
>
> The data sheet that I have for a 78MxxC/LM340 lists the Vo at 4.8 to
> 5.2 at 5mA < Io < 1A.
>
> I can forward the data-sheet if you would like (or go to the
> National Semiconductor site and down load it.)
>
> Phil
>
> --- In basicstamps@y..., Kevin Olalde <kolalde@h...> wrote:
> > Can the 7812 be skipped? I'm not saying that's what the original
> problem is,
> > just wondering why the whole curcuit can't just be run from the same
> 7805 (or is
> > there a specific need for 12V)?
> >
> > Kevin
> >
generate 12V (if so, I understand that). Tim's original post didn't give any
reason why 12V was needed, so I was wondering, out loud, why he needed the two
voltages?
He's since posted that he's using a 12V relay, so now the other voltage makes
more sense to me.
Kevin
Phil Keller wrote:
>
> The data sheet that I have for a 78MxxC/LM340 lists the Vo at 4.8 to
> 5.2 at 5mA < Io < 1A.
>
> I can forward the data-sheet if you would like (or go to the
> National Semiconductor site and down load it.)
>
> Phil
>
> --- In basicstamps@y..., Kevin Olalde <kolalde@h...> wrote:
> > Can the 7812 be skipped? I'm not saying that's what the original
> problem is,
> > just wondering why the whole curcuit can't just be run from the same
> 7805 (or is
> > there a specific need for 12V)?
> >
> > Kevin
> >