Homebrew PCBs

Hello mpdickens,

Wednesday, November 12, 2003, 5:40:56 AM, you wrote:

<snip>

m> I use quantity-4, 8-watt black lights. They emit UV
m> radiation around 325 to 350nM range which is the part
m> of the spectrum this type of resist reacts to. So, my
m> exposures are short: Depending on the size of the card
m> and the distance from the lamps, anywhere from 30
m> seconds to 5 minutes.   


And I replied:

Do  visit  the following location http://www.stoufer.net and try to find the
explanation  on  using  the  21 step Stoufer gauge for determining the right
time  for  wxposure.  The board area is in no relation to eposure time. Only
the distance from the bulbs to ypur artwork/board combo.

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