1. Introduction
The Kebidu JQ-D129BT is a versatile 10W digital amplifier and MP3 decoder board designed for various audio applications, including car audio systems and DIY home projects. It features Bluetooth 5.0 connectivity, FM radio, USB and TF card playback, LINE IN audio input, and microphone support for hands-free calling and karaoke functions. This manual provides detailed instructions for setting up and operating your device.
2. Features
- Digital Amplifier: 2*5W output, capable of connecting two 5W speakers simultaneously.
- Bluetooth 5.0: For wireless audio streaming and hands-free calling.
- MP3 Decoder: Supports MP3, WMA, WAV, APE, and FLAC lossless music formats.
- FM Radio: Frequency range 87.5—107.5 MHz with automatic station scanning.
- Multiple Inputs: USB port (up to 32GB), TF card slot (up to 32GB), and LINE IN (AUX) audio input.
- Microphone Support: Includes a microphone interface for karaoke and hands-free communication.
- Remote Control: Full-function infrared remote control for convenient operation.
- Folder Switching: Easily navigate through music folders on USB/TF storage.
- LED Display: Color screen display with red digital readouts for status and track information.
3. Package Contents
Please check the package for the following items:
- 1 x Kebidu 10W Digital Amplifier MP3 Decoder Board (JQ-D129BT)
- 1 x Remote Controller
- 1 x Wiring Harness Set (for power and speaker connections)
4. Specifications
| Parameter | Value |
|---|---|
| Model | JQ-D129BT |
| Power Supply Voltage | DC 5V (range 3.7V-5V), current ≥ 2A |
| Output Power | 2 * 5W (supports two 5W speakers) |
| Bluetooth Version | 5.0 |
| Music Formats | MP3, WMA, WAV, APE, FLAC (lossless) |
| FM Radio Frequency | 87.5—107.5 MHz |
| USB/TF Card Support | Up to 32 GB |
| Panel Dimensions (L x W x D) | 94 mm x 35 mm x 38 mm |
| Remote Control Dimensions (L x W) | 85 mm x 39 mm |
| Special Features | Radio Tuner, Microphone Support, Hands-free Calling |
| Certification | CE |
5. Component Overview
Familiarize yourself with the various components and interfaces of the decoder board:
- Microphone Jack: Input for an external microphone (6.5mm interface).
- IR: Infrared receiving module for the remote control.
- LED Display: Color screen display, digital display in red, showing track info, frequency, etc.
- USB Port: Connect a USB flash drive (max 32 GB) for music playback.
- OFF/ON: Power switch for the device.
- VOL- Button: Short press for previous song; Long press to decrease volume; Double-click to switch to the previous folder.
- AUX: Audio input interface for external devices.
- SCAN Button: Short press to switch between pause and play; In FM state, short press for automatic station scanning.
- TF Card Slot: Insert a TF (MicroSD) memory card (max 32 GB) for music playback.
- VOL+ Button: Short press for next song; Long press to increase volume; Double-click to switch to the next folder.
- MODE Button: Short press to cycle through input modes (USB/TF/LINE IN/FM/Bluetooth).
- DC 5V Input: Power input port for the device.
6. Setup Instructions
Follow these steps to set up your Kebidu MP3 Decoder Board:
-
Power Connection:
Connect the provided wiring harness to the DC 5V input terminals on the board (VCC(+) and GND(-)). Ensure the power supply is DC 5V (within 3.7V-5V range) and provides at least 2A current. Incorrect voltage or insufficient current may damage the device or affect performance.
-
Speaker Connection:
Connect your 5W speakers to the R(-)R(+) and L(-)L(+) terminals using the wiring harness. Ensure correct polarity for optimal sound quality. The board supports two 5W speakers.
-
Microphone Connection (Optional):
If using a microphone for karaoke or hands-free calls, plug it into the 6.5mm Microphone Jack on the front panel.
Figure 6.1: Microphone connection. -
Initial Power On:
Once all connections are secure, switch the OFF/ON button to the 'ON' position. The LED display should light up.
7. Operating Instructions
7.1. Basic Operation
- Power ON/OFF: Use the OFF/ON switch on the front panel.
- Mode Switching: Press the 'MODE' button on the front panel or remote control to cycle through available input sources: USB → TF → LINE IN → FM → Bluetooth.
- Volume Control: Use the 'VOL+' and 'VOL-' buttons on the front panel or remote control to adjust the volume. Long press for continuous adjustment.
- Play/Pause: Press the 'SCAN' button on the front panel or the Play/Pause button on the remote control.
- Next/Previous Track: Use the 'VOL+' (next) and 'VOL-' (previous) buttons on the front panel (short press) or the corresponding buttons on the remote control.
7.2. USB/TF Card Playback
- Insert a USB flash drive into the USB port or a TF card into the TF card slot.
- The device will automatically switch to USB/TF mode and begin playing music. If not, press the 'MODE' button to select the correct source.
- Use 'VOL+' / 'VOL-' for track navigation and 'SCAN' for play/pause.
- To switch between folders, double-click the 'VOL+' (next folder) or 'VOL-' (previous folder) buttons.
7.3. Bluetooth Operation
- Switch the device to Bluetooth mode using the 'MODE' button. The LED display will show "BT" or a similar indicator.
- On your smartphone or Bluetooth device, search for available Bluetooth devices. The device name will typically appear as "kebidu BT5.0" or similar.
- Select the device to pair. Once connected, you will hear a confirmation tone.
- You can now play audio from your connected device. Use the board's controls or your phone to manage playback and volume.
- For hands-free calling, accept incoming calls from your phone. The built-in microphone (or external microphone if connected) will be used for communication.
7.4. FM Radio Operation
- Switch the device to FM mode using the 'MODE' button. The LED display will show the current FM frequency.
- Press the 'SCAN' button (short press) to initiate an automatic station scan. The device will search for and save available FM stations.
- Use the 'VOL+' and 'VOL-' buttons (short press) to navigate between saved stations.
7.5. LINE IN (AUX) Mode
- Connect an external audio source (e.g., smartphone, MP3 player) to the AUX input jack using a 3.5mm audio cable (not included).
- Switch the device to LINE IN mode using the 'MODE' button.
- Audio from the external source will now play through the connected speakers. Control playback from your external device.
7.6. Remote Control Functions
The remote control provides convenient access to all major functions:
- Power Button: Turns the device on/off.
- Mode Button: Cycles through input modes.
- Play/Pause Button: Toggles playback.
- Previous/Next Track Buttons: Navigates tracks.
- Volume Up/Down Buttons: Adjusts volume.
- EQ Button: Cycles through equalizer presets (if available).
- Number Buttons (0-9): Direct track selection (in USB/TF mode).
- USB/SD Button: Directly selects USB or TF card mode.
- Scan Button: Auto-scans FM stations.
8. Maintenance
- Keep the device dry. Moisture can damage the electronic circuits.
- Do not expose the device to extreme temperatures.
- Clean the device with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Avoid dropping or subjecting the device to strong impacts.
- When not in use for extended periods, disconnect the power supply.
9. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Incorrect power connection; Insufficient power supply; Device off. | Check VCC(+) and GND(-) connections. Ensure power supply is DC 5V (3.7V-5V) and at least 2A. Turn the OFF/ON switch to 'ON'. |
| No sound | Incorrect speaker wiring; Volume too low; Incorrect mode selected; Faulty audio source. | Check speaker polarity (R(-), R(+), L(-), L(+)). Increase volume. Ensure correct input mode (USB, TF, Bluetooth, AUX). Test with a different audio source. |
| Bluetooth not connecting | Device not in Bluetooth mode; Bluetooth disabled on phone; Device already paired. | Switch the board to Bluetooth mode. Enable Bluetooth on your phone and search for "kebidu BT5.0". Disconnect from other Bluetooth devices if necessary. |
| USB/TF card not playing | Incorrect format; Card/drive not inserted correctly; Card/drive capacity too large. | Ensure music files are MP3/WMA/WAV/APE/FLAC. Reinsert USB/TF card. Max capacity is 32GB. |
| Remote control not working | Battery depleted; Obstruction to IR sensor; Remote too far. | Replace remote control battery. Ensure no obstructions between remote and IR sensor. Operate within range. |
10. User Tips
- For best sound quality, ensure your speakers are rated at 5W and connected with correct polarity.
- When using the microphone, keep the volume at a moderate level to avoid feedback or distortion.
- If experiencing interference with FM radio, try repositioning the device or connecting a simple wire antenna to the FM antenna point (if available on the board, not explicitly labeled in images but common).
- Always safely eject USB drives or TF cards from the device when possible, or power off before removal, to prevent data corruption.
11. Warranty and Support
For any issues or support inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase for warranty claims.
