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Tested on real breadboard :-)
In real life, it goes smoothly and a little faster than in the emulator. In the emulator sticks a little bit on the last led, but this does not happen on the breadboard.
The 12 NOT logic gates are actually one 4050 IC non-inverting buffer. They are equivalent.
Between 390R and 270R at the input, we have 5V for the 4050 Pin-1.
Every voltage divisor in the rows go to the input pins 3, 5, 7, 14, 11, 9, and the out pins 2, 4, 6, 15, 12, 10 go to the LEDs.
Pin 8 is connected to the ground.
How does it work?
The inductor in series with 560R progressively increases the voltage and charges the capacitor.
Then when the switch is off, the capacitor discharges slowly through the 1K resistor.
The 4050 is fed at 5V and considers HIGH-level when input is >=3.5V
Therefore, when the voltage curve is progressively above 3.5V, the LEDs are turned on one after another.
And when the voltage curve is progressively below 3.5V, the LEDs are turned off.
You can see a video of the working breadboard here: https://youtu.be/jnvrf2GxHZQ
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