[sdiy] Dual ground planes

[Paul Perry]

Copper areas on boards are like commas when you are 
writing prose, or spices when you are cooking: you 
probably need them, but it's worse than useless if you
throw them around randomly.

It's well worth THINKING about what you are doing - 
or, what the copper is doing.
An unconnected  floating area is unlikley to do any good at all.

Think star grounding - and why one needs it.
If you have digital and analog on the same board, think
about possible interference if parts of the ground return
is common. And remember that the power rails can be as troublesome 
as the ground.

There are only two things that can reduce me to tears - women
and ground problems. Ground problems can be solved.

paul perry Melbourne Australia