> I'm quite sure I'm missing something simple in the way the various
> power and ground nets are supposed to connect together on the board, but
> don't need to be physically connected with a net on the schematic.

Eagle will automatically connect a net and any power pins on devices if
they have the same name.  Personally, I don't like this at all.  First,
power connections should be shown in the schematic properly.  Second,
there may be several power supplies, and I don't like the idea that Eagle
might implicitly hook a chip to one of them.  I always label my power nets
something like "+5V" to avoid any chance of accidentally being connected
to pins named "Vcc".  Unfortunately then Eagle insists on complaining
about a power pin not connected to a net of the same name in the ERC,
which makes it that much more difficult to spot a real problem.  Argh!


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