Homebrew PCBs

you're right in your assumption. I keep trying to nail the moving 
rabit with negatives... Mike

--- In Homebrew_PCBs@yahoogroups.com, "Jeremy Taylor" <jt@j...> wrote:
> 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@c...>
> 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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