Homebrew PCBs

Hello ghidera2000,

01. January 2003, 20:29:37, you wrote:

ggyc> would qualify as a UV source - it doesn't (silly me :D) Exposed for
ggyc> 60 seconds and tossed it into the developer. Sat there for two 
ggyc> minutes with zero effect. I rinsed it off and re-exposed for 6 
ggyc> minutes (board is gone, may as well experiment). Developed in like 1 
ggyc> minute and it was PERFECT. Couldn't believe it. I expected to see a 
ggyc> ghost of the first exposure but there was none at all.



And I replied:

  There are a lot of info on PCB making. I've made the axposure unit using 2
  Philips  TL20/09N  20W  tubes that are quite radiating in the UV spectrum.
  Peek  output  is  somwhere  arround 340-360nm range. the /09 type of tubes
  have  more UV radiated than /05 type. The tubes are rised approx 20cm from
  the  board covered with the artwork, and the exposure time that I use is 5
  minutes,  determined  with stouffer gauge, and each of the boards that I've
  made  came  out  perfectly. (artwork - graphical film made in the printing
  shop covered with ordinary 2mm glass).

  interesting links:
  www.thinktink.com
  www.stouffer.net

-- 
 Best Regards,
 Zoran
 mailto:zasto@...