>
>
> --- In oopic@yahoogroups.com, "design.wonk" <design.wonk@> wrote:
> >
> >
> > --- In oopic@yahoogroups.com, "rtstofer" <rstofer@> wrote:
> > >
> > > --- In oopic@yahoogroups.com, "design.wonk" <design.wonk@> wrote:
> > > >
> > > > When adding regulated servo power I assume that I would
> > > > 1) Add a regulator
> > > > 2) Move the PSL jumper form +SP to +SPR
> > > > 3) Move jumpers s1 to s4 as needed
> > > > 4) Connect a secondary 9V power source to pins 6 and 7 of the
> > > > optional power pins.
> > > >
> > > > sound right?
> > > >
> > > >
> > >
> > > Yes
> > >
> > > As long as you don't want to use the existing voltage regulator
> that
> > > is intended to driver peripheral and servo loads.
> > >
> > > But, if you are talking about servo power only, why not plug a 6V
> > > battery into +SP and Gnd and call it a day? You certainly don't
> need
> > > sub 1% regulation for servos.
> > >
> > > The power design of the R board is quite flexible. Well thought
> out...
> > >
> > > I think Dan's point is to be absolutely certain that the pinout
> on the
> > > R board for the 3d regulator actually matches a 7805 and not one
> of
> > > the others. I don't have an R board so I can't check. But for
> servo
> > > power I wouldn't be adding a regulator anyway.
> > >
> > > Richard
> > >
> >
> > Richard,
> >
> > Actually, I am not using it for servos. I want to run 6 Sharp IR
> > sensors on a single ooPIC-R (the big GP2Y0A700K0F sensors that draw
> > about 350mA each).
> >
> You are going to have a lot of trouble getting 2.1A out of a 7805 (1A
> Max). You may need to look into building an off board regulator for
> each one. I don't like to pull more than 0.5A from one regulator.
> It also depends on your supply voltage as to how much current you can
> get from a regulator. The higher your supply, the more power the
> regulator has to dissipate. Pd = (Vs - 5) * Io. If I am going to be
> pulling more than 50mA, I will usually put a heat sink on it.
>
Maybe I am way over my head on this one, but I was going to try to
split the sensors between the existing regulator and the additional
optional regulator. I had no problems running three of the sensors on
the ooPIC-R using just the existing regulator. But maybe I am reading
the datasheet wrong. When running the three sensors, the regulator
never even felt warm.
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