[sdiy] PCBoards at home

[dj hohum]

Indeed, I opened one of them, straight up dark purple. It comes with
some developer chemical which I suspect is equally useless. How does
one normally remove the resist?

Thanks

On 5/28/07, KA4HJH <ka4hjh at gte.net> wrote:
> >Hi All,
> >
> >I have some old  kepro photosensitized pc boards. They are  dated
> >1997. They, of course, are still sealed, but I'm wondering if they are
> >any good.
>
> The resist (at least what they were using back then) goes bad after about
> 12-18 months. If you open one up you'll probably discover it's turned a
> deep purple, the same as if it were (over) exposed.
>
> >It's no loss if they're not, they were free and can still be
> >used in the traditional manner.
>
> Just remove the resist and you've got a blank PC board. Note that it might
> be hard to remove after all this time. Do you have the chemicals? Some
> serious soaking and scrubbing may be required.
>
> >I have a small glass plate with foam
> >back and clamp to sandwich the negative for exposure. What kind of
> >lamp do I need? Can I get something cheap at the hardware store that
> >will work well?
>
> I used a picture frame and sunlight. Since the exposed area turns purple
> it's rather easy to tell if you've got it.
>
> >These are a negative process board. What is the most efficient modern
> >way to diy boards at home? Although I like the idea of having someone
> >else do them, it still seems like it's more expensive for small
> >quantities.
> >
> >Any tips would be appreciated.
>
> As Karl already pointed out the dry transfer method may be the simplest for
> DIY. It's a real pain getting negative shot anymore.
>
> --
>
> Terry Bowman, KA4HJH
> "The Mac Doctor"
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>