This is a just-for-fun-project. I wanted to make a small circuit which uses only a few discrete components to make a chasing light like effect.
The PCB is a circle with a radius of 13.5mm. The circuit consists of 7 inverter stages which are connected in a circle. Hence the name "Ring Oscillator".
Each invertar consists of a N-Channel MOSFET, two resistors, one LED and one capacitor.