One Laser + Hourglass + Circuits = Crazy Gijs Noise Generator
Now, here’s the way to do an analog noise generator oscillator: use grains of sand.
As falling sand interrupts the flow of a laser to a light-sensitive sensor (a photodetector), the circuit produces random oscillations of sound. It’s the latest brilliant creation of mad Dutch scientist Gijs Gieskes, the industrial designer-turned-musician whose inventions often center on some physical and mechanical apparatus. Just for good measure, the project is mounted to a clear frame so it can be fit to a Eurorack modular setup.
You can try building this yourself; as with all of Gijs’ projects, the circuit is freely available online.