🚀 go-pugleaf

agodwin@acorn.co.uk (Adrian Godwin) writes:

>I'm still trying to get the plotter to work before trying the direct-plot method, 
>but I see that several people have made double-sided boards using one or other 
>of these methods : how did you manage to get good registration between the two sides ?

  The best technique I've used is to etch and drill one side of the board
(the other side being covered by masking tape) then use the drilled holes
for alignment of the second side.  Masking tape on the etched side keeps
those traces intact when you etch the second side.

  Instead of drilling all the holes, I usually include four registration pads
at the extreme corners of the PCB so that if a little etchant leaks through
the hole from the side being etched, nothing critical is damaged.