Electronics > PCB/EDA/CAD

PCB Exposing

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Adwaittronics:
In PCB exposing method by using ultraviolet tube which is suitable, UV-A  tube or UV-C tube?
If  I have not mistaken Philips has a Actinic BL series of UV-A tubes and another company called Sylvania has BL 350 series of UV-A tube am I  correct?

jahonen:
UV-A should be sufficient to expose PCB, and better for your health :) UV-C would be the one to erase EPROMs.

Regards,
Janne

Zepnat:
Bug zapper tubes worked best for me, the ones with white phosphor and give a pale blue light.
Black phosphor UV tubes didn't work at all.
Don't know about the clear ones they might work but not good for your health if left visible.

 Edit: a quick google suggest BL is the tube to look for around 340-350nm UVA.

SeanB:
Both will work, but the UV-C tubes will give a finer resolution if the mask and the resist will allow it. Can also be used to erase Eprom as well, and cure some clear epoxies.

homebrew:
Curiously the best results I had with a cheap 300W halogen floodlight (obviously with the UV-Filter Glass removed). Distance 30cm, exposure time 8min. Worked much better for me as a professional UV-exposure unit.

I assume that my inkjet transparency "films" were simply not opaque enough in the UVC range - hence the disappointing results.

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