Stellar CupCake Synth - The Simplest Sound Generating Circuit Step by Step Guide

Stellar CupCake Synth is the simplest sound generating circuit. based on a Flashing LED as the sound source.
This kind of LED comes with a tiny built in MCU that generates PWM sequences.
The Piezo element acts as the output speaker of LED signals .
the Cupcake is used for amplification.
Stellar CupCake Synth was created last summer at PIFcamp 2017 in slovenia.

Step by Step Guide in pdf format