Homebrew PCBs

Tue, 27 May 2008 10:37:39 -0000, you wrote:

>Hi There,
>
>I've been creating my own pcb's for a while now using photosensitive
>boards and a uv light. My current uv light consists of a old scanner
>with three uv tubes in it. I'm currently looking to rebuild it and i
>found this website :
>
>http://www.prototrains.com/etch2/uv1.html
>
>This looks like a nice unit, but I don't understand what the grid
>between the light and the boards are for? Won't it break the light
>going to the board ?

A little.  It looks like it's trying to minimize off axis UV, so the
UV is mostly perpendicular to the board.  That and perhaps a little
diffusion,

I have 4 UV longwave lights that I've used.  They seem to work well.
I've got a modified vacuum frame for single sided exposures.

Doing DS toner transfer, though, for now.

Harvey

>
>Any other ideas on possible improvements for a uv exposure unit while
>I'm redesigning?
>
>Thanks,
>Tom
>