Homebrew PCBs

On Sun, Jul 7, 2013 at 1:06 PM, fred27murphy <fred27murphy@...> wrote:
>
> FWIW, for my first board I just got results that are easily good enough
> for TSSOP by putting the board on the roof of my van about 20cm below a
> standard fluorescent (i.e. visible light) in my garage.
>
A drive-in printer!! Very cool! 

Back in the 70s, I used to expose offset printing plates using a 300w blue
frosted bulb with a high-UV output. It was just a regular screw-in
(Edison-base) bulb and I used a common clamp-on lamp at about 30." I used a
sheet of 1" sponge foam and a 1/4" thick glass plate to clamp the negative
and plate during exposure. A very crude but also very effective setup. I
just did a Google search for those bulbs and I haven't found them yet. I'll
keep looking. 

73,

Todd
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K7TFC / Medford, Oregon, USA / CN82ni / UTC-8
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QRP (CW & SSB) / EmComm / SOTA / Homebrew / Design


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