> On an aside, would it be possible to expose sensitized PCBs with a
> photographic enlarger? I know it would likely be impractical, as you'd
> have to get the sizing and focus perfectly right, which means it would
> likely be easier to just use a contact layout to shield the board. Plus,
> I don't have an enlarger :)

I experimented with that a very long time ago (mid 1970s).  It can be done,
but requires exposures measured in numbers of half hours with ordinary
enlarger lamps.


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