[sdiy] PCB exposure

[Scott Bernardi]

You can use a standard fluorescent light fixture - the exposure times
just increase over pure UV. I use a unit I got from Circuit Specialists
http://www.web-tronics.com/exposuresystem.html. Exposure time is 8 - 10
minutes. 
With a true UV lamp setup, these times would decrease down to a couple
of minutes. Circuit Specialists also has a "deluxe" exposure unit ($429
http://www.web-tronics.com/deluvexunwit.html).

An etchant tank with a heater and agitator is a much. Again, Circuit
Specialists has all the stuff , plus presensitized PCB's, developer,
etchant (ammonium persulfate - lots nicer than ferric chloride).
http://www.web-tronics.com/printed-circuit-board-supplies.html


BRAVINE wrote:
> 
> hi everyone,
> 
> For making my own PCBs, I think it would be best to buy positively
> sensitized PCBs and transfer the artwork from a properly scaled ink-jeted
> transparency.  Now I'm trying to decide whether I should try to build an
> exposure unit or use a pre-made solarium (small-sized, of course).
> 
> Only problem with the exposure unit is gathering the right parts - I'm not
> exactly sure of the right ones.  I know I need coils and a starter and a
> couple UV lamps (flood-type, or use aluminum foil for reflection), but where
> would I find these items?  Maybe a photo supply shop?  I'm really
> considering finding a cheap solarium.
> 
> Any comments or suggestions regarding PCB fabrication in general would be
> very appreciated.  Thanks.
> 
> jeff
> 
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-- 
Scott Bernardi
sbernardi at home.net