The slots machine is a small project I made during my SMD-course. In principle it is just three running lights each with its own 4046 clock source and 4017 decade counter. Every clock source has the same RC-oscillators but because of tolerances they are never identical. That’s why the lights are moving at different speeds. With a Start-button you set off all three lights. To stop them you can stop all of them either at once or independent from each other.

Well… basically that’s it… Schematic and picture as usual: