20 channel MP3 Audio Playback Control board

MP3 Audio Playback Control Board – 2x25W Class D Amplifier with 20 Isolated Inputs

Designed for industrial environments where noise immunity matters, this MP3 audio playback control board accepts DC12~24V and drives two 10–25W speakers directly. The 20 control inputs are optically isolated GND triggers, eliminating ground loops and false triggers. Audio can be stored on either the onboard 128Mbit flash or a microSD/TF card (up to 32GB). Update content easily via USB port – supports MP3/WAV.

At the heart of this board is a 24-bit stereo DAC paired with a high-efficiency Class D amplifier (>85% efficiency), delivering clean 2x25W into 8Ω loads with minimal heat generation. Each of the 20 inputs supports a dedicated “one-to-one” audio file mapping – press a key, play a specific track. The wide power range (12-24V DC) and industrial anti-interference design make it suitable for interactive kiosks, public address systems, factory warning devices, voice guidance for machinery, and automated announcement systems. Firmware and audio files can be reprogrammed through the USB port without desoldering or specialized tools.

Key Features of MP3 audio playback control board

• 2x25W Class D amp – Drives two 8Ω speakers (10–25W each)
• 20 opto-isolated GND trigger inputs – Noise-immune, one-to-one control
• Dual storage – 128Mbit onboard flash + TF card slot (max 32GB)
• USB programmable – Easy audio/firmware updates
• Wide power – DC12~24V for industrial use
• MP3/WAV support – 24-bit stereo DAC
• Industrial design – Strong anti-interference

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