This is the “Infinity Disco Lights”, or “how to abuse a digital counter”. Who doesn’t like circuits with LEDs, especially if they flash in a cool, let’s say infinity, pattern? Well, I do. Since music is one of my passions, I wanted to build something that connects the two. Enters the disco light. This neat circuit listens to music via an electret microphone, and flashes the LEDs in an infinity pattern following the rhythm.