Hi,
Years ago I tried to locate a UV light to erase Eproms. I
got alot of bad info. The Blacklight for posters is not
the right wavelength. UV bulbs look like a clear florescent
light bulb. They used to come with a drop of mercury in them. After
trying to buy one, I found one in a Tropical Fish store. They
are used in a Sterilizer. Water passes past the bulb and the
germs in the water are killed. Do not look at the light while
it is on!!! It may look like it is not bright but it can give
you welders flash! You will wake up 2 o'clock in the morning with
the feeling sand is in your eyes. Be careful!
John
--- In Homebrew_PCBs@y..., "johnman9146" <johnman@d...> wrote:
> Several of you have written of the benefits and good quality that
can
> be had by using the photoresist copper clad boards. You now have
my
> interest.
>
> I have some of the raw materials to attempt this method including
pre-
> sensitized copper clad, and developer. I even have glass plates to
> keep the transparancy in close contact with the copper.
>
> I do not have a UV light source. I didn't buy one as I didn't want
> to spend the money. Some of you have told me that you made a light
> box. What types of lights/lamps work for exposure? I saw
somewhere
> that a blacklight works. Is this true?
>
> Our old Diazo machine at work seems to have a long
> flourescent "black" light that it uses to expose diazo paper.
> (BLUELINE MACHINE). How would I construct a lightbox for exposure?
>
> Most if not all my PCB's are small. Thje biggest board that I have
> etched was 5x7, so I don't need a giant box.
>
> I don't need any help with making transparancies as I have access
to
> a photoplotter (typesetting machine that directly exposes film).
> There are no issues with film growth as there is no heat in the
> process. There are no issues with pinholes/banding as this is a
> professional imager used to expose printing plates for magazine
> reproduction. All I must do is output 1-to-1 EPS file and the
imager
> does the rest.
>
> So please, if you could help me build a UV light source to expose
> small PCB's, I would appreciate it.
>
> Thanks