Homebrew PCBs

Hello Tim,

Thursday, April 04, 2002, 5:25:55 PM, you wrote:

TG> Even better is to get some real flourescent UV bulbs. I got mine from a
TG> local lighting supply house. I just looked for light bulbs in the yellow
TG> pages. The bulbs are F20T12/BL and cost me about $10 per tube when I bought
TG> them last year. They are a 2' long bulb and go into a standard fixture that
TG> I got at Home Depot. I added a 5 minute mechanical timer to control the
TG> exposure.

TG> Tim
TG> [Denver, CO]

And I replied:

  Just my \ufffd 0.02.

  Take a trip to the www.thinktink.com
  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 8
  minutes  (still  have to obtain the Stoufer gauge to determine the correct
  time),  but  nevertheless,  the boards that I make are always well exposed
  (covered with 2mm thick ordihary glass).
  The whole unit costed me arround $ 20 (DM 50.-) as follows:

  * Philips TL20/09N                                   DM 10.-
  * Balasts 20W                                        DM 10.-
  * Chipwood for box                                   DM 10.-
  * Various screws, nuts, washers                      DM  4.-
  * Starters for fluorescent lamps                     DM  2.-
  * Power cable                                        DM  2.-
  * PVC pipe 110mm dia 1m length                       DM  3.-
  * Al foil for reflectors                             DM  1.-
                            TOTAL                      DM 42.-

-- 
 Best Regards,
 Zoran A. Scepanovic
 mailto:zasto@...
 http://zasto.bizhosting.com