LEDs without the use of current limiting resistors

magagna:
As an aside, this is easily my favorite thread of the new year.

Not one mention of Sparkfun's place in all of this yet (OP's example was written by a Sparkfun employee).

Sparkfun did sell a no-resistor-multiplexed-led display, their 7 segment serial display. They updated it. Spot the difference :wink: