Homebrew PCBs

Hi Thomas,
My posting was meant to open a discussion in order to avoid making films or 
other transparencies.
Of course, multiple UV LEDs will do the job, with suitable summing optics.
Unfortunately I live in Romania, where is very hard to find UV leds or 
lasers. Optics, cheap, to allow experimenting, NO way.
E-bay is there, but no PalPay for Romania, so.....
The medium monthly salary here is $150, so everything is expensive for us. 
We have to go straight to the target, no funds for experimenting.
What remains for me is to initiate a discussion hoping someone there, with 
more possibilities....
Cristian

Hi Christian

>   Calculations:
>   Photoresist needs maximum 100mJ/sqcm, that means 4 seconds/sqcm with 
> 25mW laser.

mW/sqcm =mJ


>   That means 240 seconds for 100x60mm. Four minutes of XY Plotter work.
>   If my calculations are correct, that is not too much.
>   Cristian



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