>
> > OK, how does this sound:
> >
> > I run all of my sensors off of the aux 5A v.reg and attach a
small radioshack part # 276-1368) with thermal epoxy for good
> > measure. The main power is a a 9V 1A connected to the primary
power connector with a second 9V 1A source connected to one of the
optional power pins (7 or 8). This seems like a reasonable
approach. I ran
> > three of the large sensors on the board with just a single 9V 1A
> > source with no apparent heat or performance problems. I have
removed the LEDs and switches on lines 5 and 6 and replaced them with
header pins to allow for 6 A2D lines. There are actually no servos
involved in this project. I am using the sensors and ooPIC-R for data
> acquisition.
> >
>
>
> I'm not sure how you would mount a heatsink but the PCB copper is
> already doing this job. I think you are overanalyzing a problem
that doesn't exist. Even if you had 6 sensors at 50 mA each (AVG)
you are only talking about 300 mA - with a 5A regulator. You're
worried about a 5A regulator sourced with a 1A power supply.
>
> Hook 'em up and see if the regulator gets hot. I'll bet it doesn't.
>
> Richard
>
Yeah, the first thing is to test it and see how hot it gets. If it
doesn't even feel hot, it's certainly ok. If it burns your finger,
then watch out. Even at full-load = 1A, the large v.reg is only
dissipating Pd = (9-5v)*1A = 4 watts. The pcb might be able to absorb
that much heat ok.
Also Richard, you should be able to epoxy a regular [.5"x.1"] TO220
heatsink to the "top" of a TO220 without too much interference with
other parts on the pcb - although I don't have an oopic-r to try it.
Also, the little smt v.reg will get hot very quickly under loading,
esp at 9v in. Those things are rated at something around 0.3W, and
that would be total load I = 0.3W / (9-5v) = 75-mA, not very much.
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