Homebrew PCBs

I think the film has the most to do with it. I have a home made 6 bulb (3
per side) box, with 18" bulbs 3" away. I use the boards from circuit
specialists, They say right on the package, 90 seconds with Real UV bulbs,
or (up to) 9 min with standard fluorescent. The black light bulbs seem to
fall somewhere in the middle. I use them - 6-7 min seems to be perfect. I'm
sure real uv bulbs would speed it up, and normal fluorescent would slow it
down (but it'd still work)
I think the difference would be more dramatic with a negative style pro
film.

----- Original Message ----- 
From: "mikezcnc" <eemikez@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, January 21, 2004 11:18 AM
Subject: [Homebrew_PCBs] Re: UV light sources question


> Notice Stefan that he sad  that the Black Light he's got does have
> the Blue Filter on them ie the types are blue... But it still beats
> the sun exposure. By deafult the Black Light is designed for human
> eyes viewing and therefore cannot be the damaging light, ie won't be
> too great as we know now, for PCBs.
>
> Mike
>
> --- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan
> <stefan_trethan@g...> wrote:
> > On Wed, 21 Jan 2004 06:37:37 -0000, Ben H. Lanmon <bhleavi@y...>
> > wrote:
> >
> > >  The tubes that I am using are Black Lite, when I got them at a
> > > lighting dist. I had asked for these with out the blue filter
> which
> > > was what M.G. Chemicals had recommended using but after I picked
> > > them up and got home with them found that they had sold me tubes
> > > with the blue filter.  I tried them and worked OK so here I am
> some
> > > 10 years later and still using them.  They are a Sylvania
> > > Blacklight Blue  F15T8/BLB   I use (4) of these at a distance of
> > > about 7" for about 5 to 6 mins.  I normally do boards 12" x 8" or
> > > 10" x 8" in size and using the M.G. Chemicals 600 series boards.
> > >
> > > Ben
> > >
> >
> > i think with the proper tubes (4 at 7") you should have 30s.
> > i am sure about that, because i used such a unit some time ago.
> > i'm sorry but i can no longer look for the type of tubes and didn't
> then.
> > the board was bungard i think, but standard sensitivity (no
> darkroom or so
> > required).
> > I suspect it must be short-wavelength UV.
> > this has more energy by itself, maybe also the resist is more
> sensitive.
> > the "black light" tubes are, as said before, long wave uv (to
> protect the
> > eyes).
> >
> > ST
>
>
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