I just use an F15T8 bulb in a standard 18" strip light fixture. Wood pieces on both ends make it 4.5" above the surface. I put a bent piece of aluminum (like a cookie sheet) directly over the bulb as a reflector. It actually hangs on the buld. Exposure time is 13 minutes with Injectoral pre-sensitized boards.
John
John
----- Original Message -----
From: David McNab
To: Homebrew_PCBs@yahoogroups.com
Sent: Friday, February 23, 2007 5:31 PM
Subject: [Homebrew_PCBs] cheap UV light sources?
Hi,
I'm looking to try out photo etching and am considering the options.
Can someone please recommend a UV lighting source which:
- is cheap
- has consistent UV output
- is readily available, or easily made up from items from general
hardware stores
- gives good results with low exposure time (preferably 5-10 mins,
I'm not keen on 30 minutes)
Also, is it hard to get good results using spray-on resist? Should I
just cop the extra cost of pre-coated PCBs?
Cheers
David
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