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after the etching tank it was time to get on that UV exposure box.
2 hours on a CAD software gave me a rough guidance what I want to build. Last week I was working on the electronics and today made the box and placed everything inside. It has a LCD display showing the exposure time (max 59mins 59secs). The last used time is saved in the EEPROM. I am still waiting for the LEDs. Other than that everything is ready.
Special THANKS goes to Uzzors for his advices in the design
P.S. I hate that I had to cover the plexy with black foil - it looked soo nice... but we don't want UV everywhere...
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Very Nice.
Yes It a shame you had to cover up that beautiful plexi glass, however did you think of just using black plexiglass as an inside cover to block or reduce the uv emitted so that you could still have the sleek look of the clear plexi glass on the outside?
Another idea perhaps couldn't you of just used 1 or 2 layers of the black foil on the inside?
On your boards for the leds are you using 1 resistor for every led?
None the less that is one VERY nice looking uv exposure box!
Now on the questions : - the black plexy I can buy here is 3mm thick (wich is too flimsy to use without other support (and cost almost the same as the 6mm clear ?!?!?!). Also have a great quantity of 6mm plexy laying around sooo keep it cheap the foil costed like 60 cents sooo ....
-i've tryed putting the foil on the inside - but no mater what I did - there were some very small air bubbles left - you can see that on the cover (last pic)- from the outside it is perfectly smooth, but underneath there are quite a few small air pockets - so I decided to put it on the outside.
Yep - a single resistor for every LED (I preffer that way) - I've modifyed the "electronic transformer" so now it gives about 5.2V DC - soo less heat - and if some LED goes dead for some reason (a.k.a. cheap chiness c&^*) others won't follow it
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UV exposure box
the foil costed like 60 cents sooo .... 
