Homebrew PCBs

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.