MP3 Decoder Board with 2W Amplifier | TF Card & USB Player
MP3 Decoder Board with 2W Amplifier | TF Card & USB Player
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Short Product Description
Short Product Description
The GPD2856C MP3 Decoder Board is a compact, all-in-one audio module featuring a built-in 2W mono amplifier and a 3.5mm headphone jack. It plays lossless MP3 files directly from a TF (Micro SD) card or USB flash drive. Operating on a flexible 3.7V to 5.5V power supply via Micro USB or lithium battery, it includes screw terminals for solderless speaker connection. Perfect for DIY audio projects, custom toys, and portable speakers. Available in-stock at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司).
Key Features
Key Features
- Direct MP3 Playback: Automatically decodes and plays MP3 files from TF (Micro SD) cards and USB flash drives.
- Integrated Mono Amplifier: Onboard 2W amplifier drives speakers directly without extra circuitry (up to 3W at 5V).
- Solderless Speaker Terminals: Easy-to-use screw terminals allow for quick and secure speaker wiring.
- Dual Audio Outputs: Features both direct speaker terminals and a gold-plated 3.5mm headphone/AUX jack.
- Flexible Power Options: Power via the Micro USB port (5V) or solder a 3.7V lithium battery directly to the board.
- Onboard Control Buttons: Four tactile buttons control play/pause, volume, track skipping, and loop modes.
Full Product Description
Full Product Description
Plug-and-Play MP3 Audio Decoding
This MP3 decoder board makes adding high-quality audio to your DIY projects incredibly easy. Powered by the reliable GPD2856C chip, it automatically detects and plays MP3 files the moment you insert a TF card (up to 16GB) or a USB flash drive (up to 32GB). The board defaults to the TF card but will seamlessly switch to the USB drive if no card is present. The onboard tactile buttons give you full control over volume, track selection, and playback modes (single track or all-track loop).
Built-in 2W Amplifier and Solderless Connections
You don't need an external amplifier to hear your audio. The board features an integrated 2W mono amplifier (capable of up to 3W when powered by 5V) that can drive a standard 4Ω 3W speaker directly. The speaker connects via a convenient screw terminal block, completely eliminating the need for soldering. For private listening or connecting to a larger external sound system, a gold-plated 3.5mm audio jack is also provided.
Technician Tip
When powering this module, you have two flexible options: you can use a standard 5V Micro USB cable connected to a power bank, or you can wire a 3.7V lithium battery directly to the BAT+/BAT- pads. However, if you plan to use a USB flash drive to play music, we highly recommend using a 5V power supply, as many USB drives will not function correctly on 3.7V. If you need compatible 4Ω 3W speakers or lithium batteries for your audio project, visit our physical store at Sun Cheong Computer Co. Ltd. in Sham Shui Po.
Technical Specifications
Technical Specifications
- Decoder Chip: GPD2856C
- Supported Audio Format: MP3 (Lossless decoding)
- Power Supply Range: DC 3.7V - 5.5V
- Power Input: Micro USB (5V) or Battery Pads (3.7V)
- Amplifier Output: 2W Mono (Up to 3W at 5V)
- Recommended Speaker: 4Ω 3W
- Storage Support: TF Card (up to 16GB) / USB Flash Drive (up to 32GB)
- Audio Outputs: Screw terminal block (Speaker) / 3.5mm Jack (Headphones/AUX)
- Dimensions: 47mm x 34mm
Delivery Options
Delivery Options
- Local delivery within Hong Kong and in-store pickup.
- Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
- Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
- Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
- In-store pickup details (location and time) will be confirmed by email or phone message.
- Delivery times are estimates and may be affected by weather or unforeseen circumstances.
FAQ Section
FAQ Section
Can I power this board with a 3.7V 18650 lithium battery?
Yes, you can solder a 3.7V lithium battery directly to the BAT+ and BAT- pads on the board. However, please note that if you are playing music from a USB flash drive, a 3.7V battery might not provide enough voltage for the USB drive to read properly; 5V via Micro USB is recommended for USB drives.
Do I need to solder the speaker wires to the board?
No soldering is required for the speaker. The board features a blue screw terminal block. You simply insert your speaker wires into the block and tighten the screws with a small screwdriver.
How do I switch between the TF card and the USB drive?
If both a TF card and a USB drive are inserted, the board will default to the TF card. To switch to the USB drive, press and hold the "P/P/Mode" button for approximately 2 seconds.
How do I adjust the volume?
To increase the volume, press and hold the "Next/v++" button for about 2 seconds. To decrease the volume, press and hold the "Prev/V--" button. A quick, short press on these buttons will skip to the next or previous track instead.
Is this MP3 decoder board available at your Sham Shui Po store?
Yes, we stock this GPD2856C MP3 decoder board at our Sham Shui Po physical store. You can order it online for delivery or visit us during business hours for immediate pickup.
Target Users / Applications
Target Users / Applications
- DIY Audio Enthusiasts: Building custom portable Bluetooth-style speakers using repurposed 18650 batteries and 4Ω speakers.
- Interactive Toy Makers: Adding custom sound effects or voice lines to plush toys or 3D-printed props.
- Escape Room Designers: Creating hidden audio clues that trigger when a specific USB drive is inserted into a prop.
- STEM Educators: Teaching students about audio amplification, digital storage, and basic circuit wiring without requiring soldering skills.
