Review on Uxcell Common Segment Display Digital Tools & Equipment : Garage & Shop by Geoff Foster
Prepare lots of 2N3904 transistors!
The forward voltage on these LEDs is high enough that you can't even drive these segments with a single 5V DO microcontroller. You have to drive an NPN transistor with your MCU for each segment, which of course adds 16 more components and a bunch of extra wiring (if you put base current limiting resistors on each of your transistors). However, when it comes to build quality and performance, they are top notch. Very bright, very solid and interesting to look at.
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