Homebrew PCBs

I've used 1/2" thick acrylic with a regular gas discharge desk lamp, the 
type with a magnifying glass in the middle. I don't recall the exact 
exposure times but it was only a few minutes. I wasn't in a hurry so it 
didn't matter much to me how long it took.

As an aside, I had been experimenting with toner transfer but that was 
just taking too much time to be worthwhile. I reverted to UV based 
etching and that worked much better for me. Of course the board material 
is much more expensive and UV exposure isn't trivial either but at least 
I got that to work :)

   Sander

Stefan Trethan wrote:
> On Fri, 15 Sep 2006 13:51:20 +0200, Leon Heller  
> <leon.heller@...> wrote:
>
>   
>> I think that is the case. That's why ordinary glass is OK for UV exposure
>> boxes, it doesn't absorb the longer wavelength UV. I used Perspex at  
>> first,
>> thinking it mattered.
>> Leon
>>     
>
>
> isn't perspex much less transparent to uv than window glass?
> I'm not sure at which wavelengths though.
>
> ST
>
>
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