Grumpy_Mike:
The first thing I spotted is that power supply for the right hand most 4017 is going through a resistor, it needs to be connected directly
Is it the leftmost resistor with red cables? It is a 0 Ohm resistor that I use only to manage the cables in the CAD. I've just updated the TinkerCAD to not use it. But, the result is still the same.
Post' image and link were also just updated, thanks!
Grumpy_Mike:
and in the real world each of those chips needs a 0.1uF ceramic across the power and ground pins.
What do you mean by across power and ground pins - where should it be? And why is it needed?
Thank you!