Homebrew PCBs

----- Original Message ----- 
From: "patroclus04" <patroclus04@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, April 06, 2006 8:54 AM
Subject: [Homebrew_PCBs] Will this work? (my first photo-resist PCB)


> Hello,
>
> I just got two 8W blacklight tubes, and have build some kind of
> exposure stand. I put the tubes on the bottom, facing up, and 7 cm
> above there is a transparent 0.5mm crystal. On top of it, it will be
> the PCB, facing down, with some weigth on it. Do you think this will work?
>
> I just find some problem with this approach:
> - No reflector, is it really necesary?
> - Maybe 7cm is too close to the blacklight tubes... I really don't
> know if it will be done in 2 minutes, or 6. But anyway, is it too close?

It should work OK, I have a similar arrangement that works very well. My 
distance between the glass and the tubes is greater (13 cm, IIRC). I would 
just try it and see if it works. 6 mins would be a good starting point, but 
you really need to use a test pattern and move a mask along every minute, to 
get it working optimally.

Leon 

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