Homebrew PCBs

Markus Zingg wrote:
> 
> Yes, the main advantage is that it's easier to handle. No need to
> isolate. I.e. if say at some spot there is no glue in the inner layer,
> it would not necesairly be catastrophic. It really boils down of
> applying glue to both inner layer sides, tap the outer ones on it and
> press it together as good as you manage.
> 
> The inner "double sided" material is 0.5mm sized and the outer ones
> 0.3mm together with the glue you end up with something about the
> thikness of a standard PCB.
> 

I was just going to say you can try making a 4 layer PCB using 
two 0.8mm double sided panels and laying a piece of glass cloth 
between the them. But now I've starting writing this email I 
realized the added difficulty in having to etch the inner layers 
separate from the outer layers. Your "three ply" technique (0.3mm 
+ 0.5mm + 0.3mm) still looks like the best way.

Did you have trouble finding a supplier for single sided 0.3mm 
and double sided 0.5mm board material ?  I assume these are of 
18um copper foil.

Adam