Pork Barrel: vias and c21

[divanorosso]

Hello, with reference to the double-sided rev.1 project (the last one was released and downloadable).
Please, i have two questions:
1) There are at least 10 vias that are not connected with red or blu lines. Are they vias of ground that connect the upper and rear ground planes?
2) Can you explain what the hole under C21 is for?
Thanks a lot.

[somnif]

1) There are at least 10 vias that are not connected with red or blu lines. Are they vias of ground that connect the upper and rear ground planes?

Yep. Ground planes can get cut off by traces, so connecting upper and lower in strategic places lets you end up with one contiguous unit.

2) Can you explain what the hole under C21 is for?
Thanks a lot.

Used to be a Via on older version of the board, but it gives you an option of a standard 5mm wide cap instead of the slightly larger size the outer holes denote.

[divanorosso]

1) There are at least 10 vias that are not connected with red or blu lines. Are they vias of ground that connect the upper and rear ground planes?

Yep. Ground planes can get cut off by traces, so connecting upper and lower in strategic places lets you end up with one contiguous unit.

2) Can you explain what the hole under C21 is for?
Thanks a lot.

Used to be a Via on older version of the board, but it gives you an option of a standard 5mm wide cap instead of the slightly larger size the outer holes denote.

Ok, thank you very much for your very clear explanation.
Now, thanks to you too, I can complete the pcb and build my first Pork Barrel.