Austin, Texas, is the home of the United States Grand Prix and Circuit of The Americas, the country’s only purpose-built F1 track. Construction began on Dec. 21, 2010, and it wasn’t until two ...

There is nary a microcontroller to be found on this circuit sculpture, which uses a pair of astable multivibrator(s) to light two sets of LEDs that represent air being inhaled and exhaled.

The basic switch is then extended with an electrolytic capacitor to make a simple time delay switch, and finally we’re shown how two such circuits combine to make an astable multivibrator and ...