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 € 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