Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

----- Original Message -----
From: "Terry Mickelson" <tmdslca@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, January 20, 2005 9:33 PM
Subject: [Homebrew_PCBs] UV lamps?


>
> I'd like to build a UV box to do positive resist exposure. The
> presensitized boards are 5 by 7 inches, so the box and lamps need not
> be too large. Also not too hot as this box is only open on the bottom.
> LED's are under consideration but so far a pre-made PC board to hold
> 400 or so is too expensive. The board is nothing more than etched
> parallel lines with drilled holes every .1 inch. UV lamps are a second
> choice but they tend to fade and burn out over time.
> What are your recommendations?

UV LEDs are the wrong wavelength and don't generate enough power. I've been
using the same UV tubes for about three years and am still using the same
exposure time. They do deteriorate, but is is quite slow, especially as the
usage tends to be very intermittent.

Leon



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