This circuit consists of a strip of six LED working through the inverted output signals of a CD4017 counter, so that you will see a dark light running back and forth.
Read more »Running LED circuit using the inverted output signals of the CD4017 decade counter
The CD4017 is a standard part in my stock parts bins. It's such a useful part! I've honestly used the 4017 more than I've used 555 timers! I most frequently use them in nixie tube clocks. Who needs a stinkin' micro when you have a clean time pulse and a series of counter dividers! :D