On Fri, Apr 2, 2010 at 5:57 PM, Russell Shaw <
rjshaw@...> wrote:
> Chris Maness wrote:
> > I made up a board on a CAD transfer program, and printed it off on a
> > transparency. I exposed it to my homebrew UV LED array for 1'30" and
> > transferred it to a store baught developer. I agitated it in the
> developer
> > at the recommended 10:1 concentration for well over 5 minutes and the
> light
> > sensitive coating showed no sign of coming off. I exposed it again for a
> > solid 5 minutes, and again put it in the developer with no sign of any
> > action. I have left in the back yard now to see if it will finally come
> > off. It does look like some milky looking material is slowly coming off,
> > but this is MUCH longer than I expected. I am asuming all the positive
> > boards require the same NaOH solution, so I don't think that's the
> problem,
> > but I am not sure.
>
> Positive resist or negative?
>
I'm an idiot. I did not realize that there is a sticker covering the
sensitive side. However, after developing, my traces look a little on the
thin side. Maybe my masque was not dark enough, or I over exposed. I ran
1m30s, using 15 LEDs on a 4x5 perf board.
Regards,
Chris Maness
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