Homebrew PCBs

Dave,

I think undercutt becomes a real issue if you apraoch 4mil traces. I 
don't think it's an issue above 10mils provided you take the usual care 
(make sure your film is printed in a way where the ink is on the side of 
the photosensitive surface of the PCB).

A not good enough film quality will also cause trouble, but I would not 
call that "undercut". So, in this context, LEDs have the advanteage to 
let you aproach really fine traces and one obviousely can build a box 
that is physically smaller than a tube based setup.

With the prices given from these e-bay sellers it's IMHO a no brainer 
though.

Markus

Dave McD schrieb:
>
> Chris and others,
>
> Won't increasing the emission angle of the LEDs increase the 
> undercutting effect and ultimately the resolution achievable when 
> exposing a board using these LEDs? Since we are talking homebrew 
> boards, how much do we really need to worry about light collumation vs 
> the granularity (resolution) of the artwork? Is there some sort of 
> rough formula?
>
> dave mc
>
>
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