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Instructions
Cut out of wood or plastic, glue in LEDs, and wire up as appropriate.
If you're using the segment boards, populate them before putting them in the layout. They're designed to run off of 5V, which is why it's set up as five parallel sets of two LEDs in series. (That's why we need five resistors-- to keep the current stable.) I run the segments off of serial-in current-limited drivers; use whatever seems easiest to you.