The Adafruit Audio FX Sound Board with 2×2W Amp is a standalone audio trigger with a built-in stereo Class D amplifier — no Arduino or programming required. Simply drag and drop WAV or OGG sound files over USB, wire up buttons and speakers, and you're ready to go. With 16 MB of built-in flash, it holds approximately 15 minutes of compressed stereo audio.

The integrated 2×2W stereo amplifier drives 4–8 ohm speakers directly with only 1% distortion, eliminating the need for an external amp. Stereo line-level output is also broken out for headphone use. The board has 11 trigger inputs and measures 1.9" × 0.85".

Key Features

• Standalone Operation – No microcontroller required; just power, buttons, and speakers
• 2×2W Stereo Class D Amplifier – Drives 4–8 ohm speakers directly with only 1% distortion
• 16 MB Built-in Flash – No SD card needed; approximately 15 minutes of compressed stereo audio
• USB Mass Storage – Drag and drop files via micro USB as if it were a USB drive
• WAV and OGG Vorbis Playback – Up to 44.1 KHz, 16-bit, stereo
• 11 Trigger Inputs – Connect buttons or switches to trigger audio playback
• 5 Trigger Modes – Basic, hold looping, latching loop, play next (sequential), and play random
• Stereo Line Output – Headphone-level output also available
• Compact Size – 1.9" × 0.85" (48 × 22 mm)
• 3–5.5 VDC Power – Works with AAA battery packs or LiPo batteries

Trigger Modes

• Basic – Tnn.WAV / Tnn.OGG – Plays once when trigger pin is grounded
• Hold Loop – TnnHOLDL – Plays and loops while pin is held low
• Latching Loop – TnnLATCH – Toggle on/off with button press, loops until pressed again
• Play Next – TnnNEXT0–TnnNEXT9 – Plays files sequentially on each press
• Play Random – TnnRAND0–TnnRAND9 – Plays a random file on each press

Also Available

• Audio FX Sound Board 16 MB – Headphone Out Only – Same storage without built-in amplifier
• Audio FX Sound Board 2 MB – Headphone Out – Lower-cost version with 2 MB flash
• Audio FX Mini Sound Board 16 MB – Smaller form factor with 8 triggers
• Audio FX Mini Sound Board 2 MB – Smallest and most affordable option

Ideal For

• Props and costume sound effects with direct speaker output
• Interactive toys and exhibits
• Haunted house and holiday decorations
• Portable audio triggers that need built-in amplification

Package Contents

• 1× Adafruit Audio FX Sound Board (16 MB, 2×2W Amp)
• 1× Header strip
• 2× 2-pin terminal blocks (for speaker connections)