Chris,
        The Eveready data book shows a #522 9 volt battery with a 8 ma load as
running 55 hours to a terminal voltage of 6.6 volts.  I do not know if
the 7805 will function below that voltage.  I would expect that your 16
ma load would run for just less than one half the time.  I would guess
about 20 hours.

bill jacobs


Tony Nixon wrote:
>
> Chris Carr wrote:
> >
> > > Hi all,
> > >
> > > Has anyone got a rough idea on a 9V battery life when the circuit draws
> > > about 16mA. I can reduce by a few milliamps by substituting a 78L05 with
> > > another type.
> > >
> > 5000 Hours.
> >
> > Tony, with all due respect,  your question is meaningless (as is my answer).
> > You  have to give more information, as do I to make my answer sensible.
> >
> > I have not told you, the nominal battery capacity, the chemistry, nor the
> > manufacturer and model..
> >
> > As it stands your question is akin to "I have a vehicle how fast will it go
> > ?"
> >
> > The vehicle could be a bicycle or a Space Shuttle  8-)
> >
> >  Regards
> >
> > Chris Carr
>
> Point taken. After I posted the question, I thought hmmmm.. silly thing
> to ask :-|
>
> I know the battery I will be using, (9V Duracell), so I'll just leave
> the PIC idling along and see how far it goes. I guess that should answer
> my own question. The circuit doesn't have to be on all the time, just
> when needed for it's purpose, which may take 5 mins to 1/2 hour(?), and
> this may be frequent, or infrequent.
>
> --
> Best regards
>
> Tony
>
> mICros
> http://www.bubblesoftonline.com
> mailto:sales@bubblesoftonline.com
>
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