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Old 7th Jul 2017, 1:56 am   #8
Terry_VK5TM
Hexode
 
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 429
Default Re: UV Dry Film PCB technique - experiences to date.

Quote:
Originally Posted by David G4EBT View Post
I always warm up the tubes for five minutes before I use the box. No idea whether the need to do that is just an 'urban myth' or whether it does make a difference
I've always warmed my lightbox tubes too (although for 15 mins) and did find that if they weren't warmed, the exposure results were variable at times.

One place I worked at had theirs permanently on during the day (it had shutters that opened and closed to admit the light to the pcb material).

Terry
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