1. Introduction
This manual provides detailed instructions for the KEBIDU MP3 WMA Decoder Board, a versatile audio module designed for DIY enthusiasts. It supports Bluetooth 5.3, USB and TF card playback, FM radio, and features a microphone input for various applications, including car audio systems, home entertainment, and karaoke. Please read this manual carefully before use to ensure proper operation and maximize your experience.
2. Safety Information
- Ensure the power supply voltage and current meet the specifications to prevent damage.
- Do not expose the device to water, moisture, or extreme temperatures.
- Avoid disassembling or modifying the board, as this may void the warranty and cause damage.
- Keep out of reach of children.
3. Package Contents
- KEBIDU MP3 WMA Decoder Board (with or without amplifier, depending on model)
- Remote Control
- Wiring Harness (for power and speakers)
Image: KEBIDU MP3 WMA Decoder Board, remote control, and connecting wires.
4. Product Overview
4.1. Control Panel Layout
Image: Front panel of the decoder board showing USB, TF, Clock, Vol-, Scan, Vol+, Mode, Aux, and Microphone input with descriptions of button functions.
- USB Port: For USB flash drive playback.
- TF Card Slot: For TF memory card playback (maximum 32GB).
- CLOCK Button: Short press to enter clock mode; double-click to adjust time/date.
- VOL- Button: Short press for previous song; long press to decrease volume or adjust time/date in clock mode.
- SCAN Button: Play/Pause; long press for microphone sound (in amplifier version).
- VOL+ Button: Short press for next song; long press to increase volume or adjust time/date in clock mode.
- MODE Button: Short press to switch modes (USB/TF/LINE IN/FM/Bluetooth); long press to start/cancel recording.
- AUX Input: External audio input.
- Microphone Input: 6.5mm interface for microphone connection.
4.2. Key Features
Image: Visual representation of the decoder board's main features including Bluetooth 5.3, USB/TF playback, microphone, radio, clock, and remote control.
- Bluetooth 5.3 for stable wireless connection.
- USB and TF card support for local music playback.
- FM Radio Tuner (87.5-107.5 MHz).
- Microphone input for karaoke and vocal accompaniment.
- Recording function (requires TF/USB storage).
- Folder switching for organized music libraries.
- Clock display.
- Remote control for convenient operation.
- Hands-free calling and navigation (via built-in microphone).
5. Specifications
| Feature | Specification |
|---|---|
| Model | JQ-D137BT (with Amplifier), 12V-15V (without Amplifier) |
| Bluetooth Version | 5.3 |
| Power Supply (with Amplifier) | DC 12V-20V, Current ≥ 2A |
| Power Supply (without Amplifier) | DC 12V-15V, Current ≥ 2A |
| Output Power (with Amplifier) | 2*30W (supports two 30W speakers) |
| Supported Audio Formats | MP3, WMA, WAV, APE, FLAC |
| FM Radio Frequency | 87.5 - 107.5 MHz |
| TF Card Support | Maximum 32GB (not included) |
| Microphone Interface | 6.5mm |
| Dimensions (Board) | Approx. 10.8cm (4.25in) x 3cm (1.18in) |
| Dimensions (Remote) | Approx. 12.3cm (4.84in) x 3.8cm (1.49in) x 8.5cm (3.34in) |
Image: Size display of the KEBIDU MP3 WMA Decoder Board and its remote control.
6. Setup Instructions
6.1. Wiring Diagram (with Amplifier version)
Image: Detailed wiring diagram for the amplifier version of the decoder board, indicating power input, speaker outputs, and FM antenna connection.
- Power Connection: Connect a DC 12V-20V power supply to the VCC (positive) and GND (negative) terminals. Ensure the current is not less than 2A.
- Speaker Connection: For the amplifier version, connect two 30W speakers to the R(+) R(-) and L(+) L(-) terminals as shown in the diagram.
- FM Antenna: Connect an FM antenna to the FM terminal for radio reception.
- Audio Output (Line Out): Use L-Out, Audio-GND, and R-Out for connecting to an external amplifier if using the non-amplifier version or for line-level output.
6.2. Microphone Connection
Image: Microphone connected to the 6.5mm interface for vocal accompaniment.
Insert a 6.5mm microphone jack into the dedicated microphone input port on the front panel.
6.3. Media Storage Insertion
- USB Flash Drive: Insert your USB flash drive into the USB port.
- TF Card: Insert your TF memory card (up to 32GB) into the TF card slot.
7. Operating Instructions
7.1. Power On/Off
Once correctly wired, the board will power on automatically when power is supplied. There is no dedicated power button on the board itself; power is controlled by the external power supply.
7.2. Mode Switching
Short press the MODE button on the control panel or remote control to cycle through available modes: USB → TF → LINE IN → FM → Bluetooth.
7.3. Bluetooth Pairing
Image: Bluetooth connectivity for hands-free calling and navigation, showing a phone connected to 'kebidu'.
- Switch the decoder board to Bluetooth mode using the MODE button. The display will show "BLUE" or similar.
- On your mobile device, search for Bluetooth devices and select "kebidu" to pair.
- Once paired, you can stream audio wirelessly and use the built-in microphone for hands-free calls.
7.4. Music Playback (USB/TF)
- Play/Pause: Short press the SCAN button.
- Next Song: Short press the VOL+ button.
- Previous Song: Short press the VOL- button.
- Volume Up: Long press the VOL+ button.
- Volume Down: Long press the VOL- button.
- Folder Switching: Use the dedicated folder switching function (if available via remote or specific button, not explicitly labeled on board image).
7.5. FM Radio Operation
- Switch to FM mode using the MODE button.
- Long press the SCAN button to automatically scan and save available radio stations.
- Short press VOL+ or VOL- to switch between saved stations.
7.6. Recording Function
Recording is only supported in TF or USB mode.
- Ensure a TF card or USB flash drive is inserted.
- Long press the MODE button to start recording.
- Long press the MODE button again to stop recording and play the recorded file.
- To exit recording mode, long press the SCAN (pause) button.
7.7. Microphone and Vocal Accompaniment
Connect a microphone to the 6.5mm input. In amplifier versions, long press the SCAN button to activate or adjust microphone sound. The board supports music accompaniment to eliminate original vocals for karaoke.
7.8. Clock Function
- Short press the CLOCK button to view the current time.
- Double-click the CLOCK button to enter time/date adjustment mode. Use VOL+ and VOL- to adjust values.
8. Maintenance
- Clean the device with a soft, dry cloth. Do not use liquid cleaners.
- Store the device in a cool, dry place away from direct sunlight.
- Periodically check wiring connections for security.
9. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Incorrect power supply voltage/current; loose connection. | Verify power supply (DC 12V-20V or 12V-15V, ≥2A); check wiring. |
| No sound | Incorrect speaker wiring; volume too low; wrong mode selected. | Check speaker connections; increase volume; switch to correct input mode (USB/TF/BT/AUX/FM). |
| Bluetooth not connecting | Not in Bluetooth mode; device too far; already connected to another device. | Ensure board is in Bluetooth mode; bring devices closer; disconnect from other devices. |
| Recording not working | No TF/USB storage inserted; not in TF/USB mode. | Insert TF card or USB drive; ensure board is in TF or USB playback mode. |
| Remote control not working | Battery depleted; obstruction; too far. | Replace remote battery; ensure clear line of sight; operate within range. |
10. User Tips
- For optimal FM radio reception, ensure a proper antenna is connected and positioned well.
- When using the recording function, always ensure you have sufficient free space on your TF card or USB drive.
- The built-in microphone is useful for hands-free calls when connected via Bluetooth.
11. Warranty and Support
This product comes with a standard manufacturer's warranty. For technical support, troubleshooting assistance, or warranty claims, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.
