[sdiy] PCBoards at home

[ChristianH]

IIRC, years ago I used acetone to remove it.

Chris



On Mon, 28 May 2007 19:47:36 -0700 "dj hohum" <djhohum at gmail.com> wrote:

> Is there anything that will dissolve it?
> 
> On 5/28/07, HL-SDK Synths <syntroniks at gmail.com> wrote:
> > steel wool, maybe a green plastic abrasive 3m pad. or some sandpaper
> >
> > On 5/28/07, dj hohum <djhohum at gmail.com> wrote:
> > >
> > > 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"