Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Henrik Olsson" <henrik-
olsson@...> wrote:
>
> Yep, the LED's they used where: Kingbright L-7113UVC.
> That particular LED has a 20 degree "beam", they put 24 of them in 
a grid 
> ~32mm appart. The distance from the LED to the PCB where 80mm and 
exposure 
> time around 6min. Or so the claim...
> 
>     /Henrik Olsson.
> 
> ----- Original Message ----- 
> From: "Leon Heller" <leon.heller@...>
> > Elektor had an article on a unit like that, for PCBs up to single 
Eurocard
> > size.
> >

Just thought You would like to know. I bought one of these UV LEDs 
out of curiosity, along with many other non-curious stuff, and it 
does perform as stated on that magazine. 
In my case I made just a small 2cm x 2cm exposure and it turn out 
great. If I ever consider building an UV exposure unit, it will be 
with UV LEDs.
Make sure their wavelength falls in your photo resistivity product.

Nuno T.