Ah, now i think i get it.
You only connect the via to the outer layers, so you can solder, not
to the layers in between. If you want to connect to the middle layers
you drill a large hole for soldering access. Interesting idea.
But can you really gain much over using wire links? This sounds like lotsa work.
ST
On 20 Nov 2007 12:59:04 -0500, DJ Delorie <dj@...> wrote:
>
> "Stefan Trethan" <stefan_trethan@...> writes:
> > I don't understand how you can solder the VIAs in between the boards,
> > for example.
> >
> > Maybe you can like sketch a cross section?
>
> I'll try... = is copper, - is some other boundary, # is solder, W is
> wire, copper marked with ∗ is drilled before taping layers together:
>
> Through via:
> #####W#####
> =================== W ====================== signal
> | W | 8 mil FR4
> ==========--======= W =======--============= ground
> | W | 16 mil FR4
> ------------------- W ---------------------- (tape between boards)
> | W | 16 mil FR4
> ==========--======= W =======--============= power
> | W | 8 mil FR4
> =================== W ====================== signal
> #####W#####
>
> Blind via:
> ###################
> =============== ######### ================== ∗
> | ######### |
> ============================================
>
> --------------------------------------------
>
> ============================================
>
> ============================================
>
>
> Far-plane via:
> #####W#####
> =================== W ======================
> | W |
> ==========--======= W =======--=============
> | W |
> ------------------- W ----------------------
> | W |
> =================== W ======================
> | #####W##### |
> =========== ============ ∗
>
>
>
>
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> http://groups.yahoo.com/group/Homebrew_PCBs
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>
>
>
>
>