Audio Adapter Plus Board for Analog Discovery

Overview

This project presents a custom-designed Audio Adapter Plus Board for the Analog Discovery platform (AD2/AD3), inspired by the original Digilent Audio Adapter+. It provides a simple and reliable way to interface Analog Discovery with external audio systems using standard 3.5mm audio connectors.

The board is optimized for signal integrity, ease of use, and compact form factor, making it ideal for both professional engineers and students working with mixed-signal and audio applications.

Key Features

• Supports both mono and stereo audio configurations
• Standard 3.5mm audio input/output jacks
• Compatible with Analog Discovery 2 and 3 (2×15 MTE interface)
• Enables waveform generation and oscilloscope-based signal analysis
• Integrated signal conditioning using precision resistors and op-amp (TLV9052)
• Pass-through support for digital I/O and power lines
• Compact 2-layer PCB optimized for low noise and stable performance

How It Works

The board connects directly to the Analog Discovery device through a 2×15 header interface. It routes waveform generator outputs and oscilloscope inputs to audio jacks, allowing users to:

• Generate audio signals (sine, square, arbitrary waveforms)
• Analyze external audio signals using oscilloscope inputs
• Perform real-time signal debugging and testing

The onboard op-amp circuitry ensures proper signal buffering and conditioning for accurate measurements and stable output.

Applications

• Audio signal testing and debugging
• Educational labs and university experiments
• DIY audio electronics projects
• Embedded system signal validation
• Mixed-signal prototyping

Design Details

• PCB Type: 2-Layer FR4
• Component Size: 0603 (SMD standard)
• High-quality MLCC capacitors and precision resistors
• Ferrite beads for noise suppression
• Zener protection for input safety

Files Included

• Gerber files
• BOM (Bill of Materials)
• Pick & Place file

Why This Project?

This board simplifies audio interfacing with Analog Discovery, eliminating the need for complex wiring and improving measurement accuracy. It is a reliable, reusable tool for engineers, students, and hobbyists.

Keywords:

Analog Discovery, Audio Adapter, Oscilloscope, Waveform Generator, Stereo Audio, PCB Design, DIY Electronics, Signal Analysis