[chbot] UV EPROM eraser to give away

[Charles Manning]

I have had the same issue and ended up just using the big Sunlamp In the Sky.

Another issue is that most small UV erasers use a pretty low intensity tube. 
That tends to give error of paralax if you hold it close, as per what Chris 
says. The exposure is also inconsistent. Areas directly below the tube gets 
high exposure while that further away is only lightly exposed.



On Wednesday 19 January 2011 07:31:54 Chris Hellyar wrote:
> Hurro..
>
> For a bit of trivia, generally UV erasers are not a point source of
> light, they're a tube of some sort...  This means your negative/positive
> has to be well flattened/ held against the sensitive PCB otherwise you
> get a fuzzy image on the resist in one axis (The long axis of the tube).
>
> I used to use a UV suntan lamp for riston board for that reason, as it
> was a relatively directional light..  I trued a UV tube and found that
> it was hard to get the negative really flat on the riston, and putting
> glass on top increased the exposure time by 3x although modern
> photoresist might be better in that sense...
>
> As always, YMMV and the experimentation is always half the fun. :-)
>
> Cheers, Chris H.
>
> On Wed, 2011-01-19 at 00:21 +1300, Paul Davey wrote:
> > On Wed, Jan 19, 2011 at 12:06 AM, Volker Kuhlmann
> >
> > <list0570 at paradise.net.nz> wrote:
> > > I realise this is museum equipment that I saved from going straight to
> > > landfill, but in case anyone still has a use for it - I guess here
> > > might be a good place to ask. Free to a new home:
> > >
> > > UV EPROM eraser, mains powered with NZ mains plug, timer. Functional.
> > >
> > > Email me offlist.
> > >
> > > Volker
> > >
> > > --
> > > Volker Kuhlmann
> > > http://volker.dnsalias.net/
> >
> > I'll take it if no one wants it, I don't have any EPROMs but it should
> > be able to easily formed into a UV lightbox for exposing
> > photosensitive PCBs without doing it any damage.
> >
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