Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

More random thoughts...

I was thinking about plated-through holes and how big fabs do them.
You drill, plate the holes, ∗then∗ etch. They use a tin electroplate
as the mask. Can we do something similar?

The idea:

Drill and electroplate the pcb.

Use a standard photomask, but in negative - expose where you want
copper to stay. Develop. Not sure if TT would stand up to the tin
plating.

Immerse in "Liquid Tin" to tin-plate the copper that's going to
remain.

Strip the mask and etch the board.