Homebrew PCBs

tin-ELECTROplated-mask is suitable (only) for ammonium-persulfate-etching.
(NH4)2S2O8
  
DJ Delorie <dj@...> wrote:
          
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.


         

       
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