Homebrew PCBs

--- Philip Pemberton <ygroups@...> wrote:


> 
> 
> Does this sound plausible? Seems it might work a bit
> better than my 
> tape-the-two-transfers-together method, which seems
> to fail dismally on 
> anything PCB blank thicker than ~0.8mm.
> 
I did some exposures using polyester paper, which
works really well.  I used push pins to get the
alignment (holes in the copper) and I put a few drops
of water on the board.  The surface tension holds the
polyester to the board during exposure.

Again, at that time I had the luxury of a calibrated
exposure system, but the exposure area was no more
than 4" x 4" at a time.

I had the luxury at one time to be able to "spin-coat"
small boards with resist, but drilling of the
alignment holes should be done after the resist is
applied otherwise the holes create undesired abnormalities.


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