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Subject: Re: [Homebrew_PCBs] Re: UV LED Exposure unit

From: DJ Delorie <dj@...>
Date: 2009-06-15

John Coppens <john@...> writes:
> Look back on the list, and look to DJ Delorie's site. He constructed a UV
> Led illuminator, and seemed happy with it.

Yup, it works great.

http://www.delorie.com/pcb/uvled/

Uses LM317's and 62 ohm resistors to make 20 mA constant current
sources. Each LM317 drives a string of 9 LEDs, 11 strings gives 99
LEDs total. Cheap and reliable.