If you tinker around with electronics long enough, you'll eventually accumulate a bin full of random spare parts. Today I take out some components from my 25+ year old collection. I bring back to life an old single-digit 7-segment display that I cut out of something rather. I haven't really touched this part for decades... turns out it still works just fine.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/tutorials/show/giving-life-to-an-old-digit-display