[snip]
> If you don't mind language that you do not understand, please visit
> http://zastos.blogspot.com photos are worth more than thousand
> words.
Unfortunately I in fact don't understand the language :) but - nice work!
>
> UV LEDs can be found much cheaper at eBay, but the UV lamps are much
> cheaper :)
Hmmm, be VERY carefull. I just was reading a post from a guy in a german
PCB forum who used such e-bay LEDs just to find out they did not worked
as expected!
I had a UV lamp based unit already, and switched to the LED variant
mostly for two reasons:
a) with the UV lamp, I had undercuts due to the way the unit was
constructed (tubes were fairly close at the PCB) and the truly non
paralell nature of such lamps.
b) the unit used four lamps which are fairly strong. Exposure time was
only 10 seconds! The fact that the lamps were not going on absolutely
synchronousely was leading to a non even exposure across the PCB which
was almost uncontrollable.
With the LEDs you have an opening angle of only 20 degrees. One could
even use a 10 mm LED pattern and put them into tubes to further narrow
this and/or also increase the distance to the PCB. But again, it turned
out very well. I'm sure though that one could also build an exposure
unit with tubes or lamps that works equally well. It just apeared to me
to be a very simple way for me to get consistant exposure with very
repeateable results.
Markus