SJ333 Bluetooth Audio Amplifier Board – Wireless MP3 Decoder Module with USB, TF Card & Audio Control Buttons

The SJ333 Bluetooth Audio Amplifier Board is a compact and feature-rich wireless audio decoding module designed for DIY speaker systems, portable audio devices, multimedia projects, and custom sound systems. Equipped with Bluetooth connectivity, TF card support, USB playback, and easy-to-use control buttons, this board allows seamless audio playback from multiple sources.

Its integrated control interface includes dedicated buttons for Mode Selection, Previous Track, Next Track, and Play/Pause/Call Functions, making audio management simple and convenient. The onboard Bluetooth antenna ensures stable wireless connectivity, while the compact PCB design allows easy integration into various electronic projects.

Whether you’re upgrading an old speaker or building a custom Bluetooth sound system, the SJ333 board provides a practical and reliable audio solution.

✨ Key Features

📶 Wireless Bluetooth Audio Streaming

• Built-in Bluetooth functionality for wireless music playback.
• Quick pairing with smartphones, tablets, laptops, and other Bluetooth-enabled devices.
• Stable signal transmission through the onboard PCB antenna.

🎵 Multiple Playback Modes

• Supports Bluetooth audio playback.
• TF (Micro SD) card music playback.
• USB flash drive audio playback.
• Easily switch between modes using the dedicated Mode button.

🎛️ Easy Audio Control

• Dedicated onboard control buttons:
  • 🔄 Mode Selection
  • ⏮ Previous Track / Volume Down
  • ⏭ Next Track / Volume Up
  • ▶️ Play / Pause / Call Control

💾 TF Card Slot

• Integrated Micro SD card slot for standalone music playback.
• No external device required once music files are stored on the card.

🔌 USB Music Playback

• Built-in USB port supports playback from compatible USB flash drives.
• Convenient plug-and-play operation.

⚡ Micro USB Power Input

• Powered through a Micro USB connector.
• Suitable for portable and fixed audio applications.

🔄 ON/OFF Switch

• Convenient onboard power switch for quick operation.
• Helps conserve power when not in use.

📦 Compact PCB Design

• Small form factor for easy installation.
• Suitable for embedded audio projects and custom speaker enclosures.

🔥 Benefits

✅ Wireless music playback without extra wiring

✅ Supports multiple audio sources

✅ Easy-to-use onboard controls

✅ Compact and lightweight design

✅ Ideal for DIY audio enthusiasts

✅ Simple integration into speaker projects

✅ Cost-effective audio upgrade solution

📋 Technical Specifications

🎯 Why Choose the SJ333 Bluetooth Audio Amplifier Board?

The SJ333 combines Bluetooth streaming, USB playback, TF card support, and user-friendly controls into a single compact module. Its versatile design makes it an excellent choice for DIY speaker upgrades, custom audio projects, and portable music systems while providing convenient wireless and standalone playback options.