Homebrew PCBs

----- Original Message ----- 
From: "yllawk" <hkwally@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Saturday, September 30, 2006 3:53 PM
Subject: [Homebrew_PCBs] UV LED arrays?


> Hi Folks,
> I'm mostly a learning lurker on these tech exchange lists, but the
> recent UV source discussion has stimulated a question I've been
> wondering about. I need a really compact UV source for a very portable
> exposure unit. Anyone know of any success using an array of UV LEDs
> as a UV light source for exposures? LEDs are pretty directional, so
> are fairly well collimated as is. And in their visible light forms,
> bright enough to use in traffic lights. But can these UV LEDs put out
> enough light energy to react the photoresist? Anybody have experience
> or know?

Elektor had an article on a unit like that, for PCBs up to single Eurocard 
size.

Leon