AVR-Chat

At 12:26 AM 2/12/2004 -0300, Ricardo Callejo wrote:

>Can you suggest where can i find some examples of good and wrong pcbs?

Not offhand.

PCB design is somewhat of an art.

I'm not at home, so I can't refer you to any books directly, but the 
general idea is that the micro should not have large currents passing by or 
through it.
The currents translate to voltage according to the resistance of the 
traces, and to magnetic fields according to the loop area.

The loop area refers to how a high current source and return path form a loop.

You might do something like this:

/---------------------------------\
|                                  |
PS                             RY
|                                  |
\---------------------------------/

which has a large loop area.

Or like this:

/-PS-\                          |/\
|       \-------------------------/  RY
\-----------------------------------/

which has a much smaller loop area.

Those tracks above would ideally be right next to each other, but I can't 
draw that in ascii.