Introduction

This board is part of a personal electronics project aimed at exploring mixed-signal design with STM32 microcontrollers. It was developed as a compact audio effects platform, capable of capturing an analog signal (e.g. from a musical instrument), processing it digitally, and outputting the modified result through a DAC.

Key Features

• 🎛️ Analog input path with anti-aliasing filters and buffering
• 🎚️ High-resolution ADC (12-bit) to digitize audio signals
• 🎧 Dual-channel DAC output with Butterworth reconstruction filter
• 🔄 STM32 microcontroller for real-time digital signal processing (DSP)
• ⚡ Powered via USB-C with onboard linear and switching regulators
• 🔐 Proper decoupling, ESD protection, and impedance matching for signal integrity

This board is not only a demo of signal chain design — from analog front-end to digital processing and back — but also a flexible teaching and prototyping platform for embedded DSP, audio experimentation, or real-time control systems.

Designed to fit in a single compact PCB and built with a modular mindset, this board reflects my interest in practical mixed-signal applications.