Homebrew PCBs

> 
> I went to my local $.99 store and purchased a cheap picture frame w/ two
> pieces of glass.  I used two plastic spring loaded clamps to hold my PCB
> sandwich together.  I find those clamps are perfect.  I have heard the
> tracing paper trick.  I actually have those OH transparency sheets laying
> around because I teach school.  But I am stuck doing one at home I will give
> it a try.
> 
> Is there a adjustment factor when using tracing sheets instead of
> transparency sheets?
> 
> Thanks,
> Chris Maness
> KQ6UP
> 
> 
> [Non-text portions of this message have been removed]
>

I found it was hard to get a solid enough print on transparencies.

Best with any method to do a test exposure. Cut a strip of board, put a test pattern on it, then cover most of it and expose for 30 sec, uncover another increment, expose, repeat until you have a strip with a bunch of segments of incrementing exposure time and note the one with the best results.