MP3 Decoder Module

Micro SD Card & USB MP3 Decoder Board with Amplifier

Product Overview

This Micro SD Card & USB MP3 Format Decoder Board is a compact PCB amplifier player designed for easy integration and modification. It delivers superior sound quality with an onboard mono amplifier and supports multiple playback sources, making it suitable for a wide range of audio projects.

Key Features

• Superior sound quality output

• Built-in 2W mono amplifier (up to 3W with 5V power)

• Direct speaker connection via terminal (recommended 8–16Ω, 3W speaker)

• 3.5mm gold-plated headphone jack for headphones or external stereo audio output

• Micro-USB power input port

• Powered by USB 5V supply or 3.7V lithium battery

• Supports Micro SD / microSD cards and USB disk playback

• No soldering required for speaker terminals, enabling easy wiring

• Designed to facilitate modification

Playback & Functionality

• Supports MP3 format with automatic playback on power-up

• Red LED flashes during MP3 playback

• Default playback mode is SD/microSD card

• Automatically switches to USB disk mode if no SD/microSD card is detected

• Manual mode switching available when both storage devices are installed

• Button controls support song selection, volume adjustment, play/pause, and mode switching

• Menu button allows selection between single-song and all-song play modes

• Default play mode on power-up is all-song mode

• Repeat button adjusts circulating playback mode

Key Operating Instructions

• Prev / V-- Button

  • Press: Previous track

  • Long press (~2 seconds): Volume down

• Next / V++ Button

  • Press: Next track

  • Long press (~2 seconds): Volume up

• P / P / Mode Button

  • Press: Play / Pause

  • Long press: Switch between USB disk and SD/TF card mode

• Repeat Button

  • Press: Toggle single-song / all-song mode

Product Specifications

Design & Build

• Exquisite double-board design

• Large copper area for improved stability and reliability

• Supplied in an anti-static bag to prevent electrostatic damage during transit

Important Notes

• A 5V power supply is recommended when using USB disk mode, as some USB drives do not support 3.7V power

• Overvoltage on the battery input connections will damage the board and is not covered by warranty

Package Contents

• 1 × MP3 Player Board