Audio Latency Tester Board

Copyright (c) 2024-2025 Antmicro

Overview

This project contains open hardware design files for an audio latency processing board. The system allows driving an external speaker and collecting audio samples from a pair of PDM or I2S microphones. The board was designed to work with a host processing platform that generates playback and processes the captured audio samples.

The design files were prepared in KiCad 8.x.

Key features

• 2x RP2040 MCU
• MAX98357A, I2S Class D Amplifier
• Zero insertion force connectors for a 5 pin, 0.5 mm pitch FFC
• 32Mb SerialRAM for playback sample buffering
• Various I/O configurations for trigger signals
• Small form factor: 80mm x 40mm

Project structure

The main directory contains KiCad PCB project files, a LICENSE, and a README. The remaining files are stored in the following directories:

• doc - contains schematics in PDF format
• assets - contains visual assets for showcasing this design on Open Hardware Portal and System Designer

Licensing

This project is published under the Apache-2.0 license.