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Received some goodies in the mail from our brethren in the Far East today :p I have never tried photolithography for producing PCB's, so I figured for a few bucks, I could give it a go. I used twenty 1w 395nM UV emitting LED's mounting on aluminum PCB which I then mounted with a heat sink epoxy...

A quick lighting of our jack o lantern this year, courtesy of 9 leds :) I used three leds in series together with a resistor. I repeated this 3x to have three separate strands powered in parallel from a 9v battery. I included a switch to make it easy for the family to turn it on/off. In each...