Homebrew PCBs

When you do four layers, how do you connect to the internal layers?

Regards,
Royce

--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
> 
> My stock includes 0.008 and 0.016 thick SS clad.  I have some 0.032
> DS.  What I normally do is mask and etch the two (or four) sides
> separately, then adhere them with double-sided sticky tape and drill.
> For small boards, I do both sides on one piece of PCB and cut them
> apart, saving time.
> 
> Two 0.16 taped together yeild a 1/32" DS.  If you add two 0.008 outer
> layers it's a bit thinner than standard 1/16" boards (the copper and
> tape add thickness).  However, it's much easier to cut 0.008 and 0.016
> than 1/16" - so I do most of the cutting *before* taping, then sand or
> file the edges smooth afterwards.
> 
> Also, the thinner boards work much better in the laminator.
> 
> I do have some 1/16" stock but as it doesn't fit in the laminator, I
> only use it when I need the extra strength.
>