Double Circle PCB - BitNotes.com

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DESIGN

Each POSITION has two LEDs in parallel and 1 resistor. You can use just one or both LEDs and should pick a resistor to set the current.
Pins for each LED in the outer circle are oriented so you can either stand the LED straight up or bend it over to radiate out over the edge of the board.
Pins for each LED in the inner circle are oriented so you can either stand the LED straight up or bend it over to view the LEDs side on leaving very little gap between segments.
Each LED is 30 degrees from each of its neighbors
The diameter of the inner circle is 45.8 mm (A little over 1 3/4 inches)
THe diameter of the outer circle is 70 mm (A hair over 2 3/4 inches)
The PCB has a diameter of 90 mm
Power can be applied in either of three ways:
1. There is a 5 pin header in the middle that could accomodate a USB breakout board (see kit for example) or just connect at "+" and "-".
2. There is an outline for a 20xx (i.e. CR2032) button cell holder. Those batteries won't last nearly as long as others, but if you have a very low current draw it might work and there would be no wires running off the board.
3. You could also use the battery contacts to direct wire to another power source.
There are 4 holes 90 degrees apart. These are all 3 mm and can be used to mount, stack, hang or just hover above a table for a glowing effect..