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

Try vellum paper.

On Tue, Feb 21, 2012 at 9:27 PM, tda7000 <Tda7000@...> wrote:

> ∗∗
>
>
> Recently I had my first try at a UV-exposed board
>
> (because I have nightmares from trying to align paper properly for a
> double-sided board with the laminator, ha ha)
>
> I used this photoresist film:
> http://www.ebay.com/itm/10pcs-Dry-Film-Photoresist-Sheets-for-DIY-PCB-6x8-q-/320735055777which worked pretty nicely, although it took me a couple of goes to get it
> on the copper without bubbles!
>
> Some UV LEDs on a sheet of protoboard for the exposure lamp, and to test
> out different spacings etc (Thanks to Chris for the LEDs!) - hopefully I
> can make a proper exposure box once (if?) I get the other issues sorted.
>
> I used my Canon iP2000 inkjet printer and inkjet transparency sheets to
> make the transparency, unfortunately it did not come out as good as I had
> hoped, as solid black fills had many quite light parts in them when held up
> to the light, and when exposed left a speckled pattern on the developed
> board.
>
> I used a solution of Sodium Carbonate (Washing Soda) to do developing.
>
> Today I tried with a Laser printer but again, holding the transparency up
> to the light I see too many light areas. I haven't tried exposing using
> that printout but I feel it will have a similar problem to the previous one.
>
> What does everyone else do to get their printouts opaque enough for the UV
> process?
>
>
>


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