Bluetooth 5.0 MP3 Decoder Board JQ-D136BT User Manual

1. Introduction

The kebidumei JQ-D136BT is a versatile Bluetooth 5.0 MP3 Decoder Board featuring a 2*25W (50W total) amplifier. Designed for DIY audio projects, car audio systems, and other applications, it integrates MP3 playback from USB/TF cards, FM radio, Bluetooth connectivity for hands-free calling and audio streaming, and a microphone input for recording and karaoke functions. This manual provides detailed instructions for setup, operation, and maintenance of your decoder board.

2. Features

• Bluetooth 5.0 Connectivity: For stable wireless audio streaming and hands-free calling.
• Integrated Amplifier: 2*25W stereo output, capable of driving two 25W speakers.
• Multiple Playback Sources: Supports USB flash drives and TF (MicroSD) cards.
• Audio Format Support: Plays MP3, WMA, WAV, APE, and FLAC lossless music formats.
• FM Radio: Built-in FM tuner with a frequency range of 87.5—107.5 MHz.
• Microphone Input: 6.5mm microphone jack for recording and karaoke.
• Recording Function: Supports audio recording.
• Hands-Free Calling: Built-in microphone for safer driving and convenient calls.
• Digital Display: LED screen with color indicators for status and frequency.
• Remote Control: Full-function remote for convenient operation.
• Folder Switching: Easily navigate through music folders on USB/TF media.
• EQ Presets: Equalizer function for sound customization.

3. Specifications

4. Package Contents

Please check the package for the following items:

• 1 x JQ-D136BT MP3 Decoder Board
• 1 x Remote Control (Small or Big, depending on variant)
• 1 x Set of Wiring Harnesses (for power and speakers)

5. Setup

Careful wiring is essential for proper function and to prevent damage. Refer to the wiring diagram below.

5.1 Wiring Diagram

5.2 Connection Steps

1. Power Connection: Connect the power supply to the designated terminals. Ensure the power source is DC 12V (within 7V-16V) and provides at least 2A.
   • Connect the negative (-) terminal of your power supply to GND(-).
   • Connect the positive (+) terminal of your power supply to VCC(+).

   Caution: Incorrect voltage or reversed polarity can damage the board.

2. Speaker Connection: Connect your 25W speakers to the amplifier output terminals.
   • For the left speaker, connect to L(+) and L(-).
   • For the right speaker, connect to R(+) and R(-).

   Note: Ensure speakers are rated appropriately (25W each) to prevent damage to the amplifier or speakers.
3. Microphone Connection: Insert a 6.5mm microphone into the MIC jack on the front panel.
4. USB/TF Card Insertion: Insert a USB flash drive into the USB port or a TF card into the TF slot for local music playback.
5. Remote Control: Ensure the remote control has batteries and point it towards the IR receiver on the front panel for operation.

6. Operating Instructions

6.1 Front Panel Controls

• VOL+ / NEXT: Short press for next track, long press for volume up.
• Play/Pause: Play or pause current track.
• VOL- / PREV: Short press for previous track, long press for volume down.
• REPEAT: Toggle repeat modes (e.g., repeat one, repeat all).
• EQ: Cycle through equalizer presets.
• MODE: Switch between input modes (Bluetooth, FM, USB, TF, LINE IN).
• MIC: 6.5mm microphone input.
• USB: USB flash drive input.
• TF: TF (MicroSD) card input.
• IR: Infrared receiver for remote control.

6.2 Basic Operation

1. Power On: Once correctly wired, apply 12V DC power. The digital display will light up.
2. Mode Selection: Press the MODE button to cycle through available input sources: Bluetooth, FM Radio, USB, TF Card, and LINE IN.
3. Volume Adjustment: Use the VOL+ and VOL- buttons (long press) on the panel or remote to adjust the volume.

6.3 Bluetooth Mode

1. Switch the board to Bluetooth mode using the MODE button. The display will show 'BT' or a similar indicator.
2. On your mobile device, enable Bluetooth and search for available devices.
3. Select "kebidu BT5.0" from the list to pair. Once connected, the board will indicate successful pairing.
4. You can now play audio from your device through the decoder board.
5. For hands-free calling, accept calls on your paired phone. The built-in microphone on the board will be used for communication.

6.4 FM Radio Mode

1. Switch to FM mode using the MODE button. The display will show the current FM frequency (e.g., 87.5).
2. To auto-scan and save stations, long press the Play/Pause button. The board will scan and store available stations.
3. Use the NEXT and PREV buttons (short press) to navigate between saved stations or manually adjust frequency.

6.5 USB/TF Card Playback

1. Insert a USB flash drive into the USB port or a TF card into the TF slot. The board will automatically switch to the corresponding mode and begin playback.
2. Use NEXT/PREV buttons for track navigation and Play/Pause for playback control.
3. The folder switching function allows you to navigate between different folders on your storage device. Refer to your remote control for specific folder navigation buttons if available.

6.6 Microphone and Recording Function

1. Connect a 6.5mm microphone to the MIC jack.
2. The microphone input can be used for karaoke or public address functions.
3. To initiate recording, ensure a USB drive or TF card is inserted. Specific instructions for activating the recording function may vary by remote control or firmware version; typically, a dedicated 'REC' button on the remote or a long press of a specific panel button is used.

7. Maintenance

• Cleaning: Use a soft, dry cloth to clean the panel. Avoid using harsh chemicals or abrasive cleaners.
• Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
• Handling: Handle the board with care to avoid damaging electronic components. Avoid static discharge.
• Power Supply: Always ensure the power supply meets the specified voltage and current requirements.

8. Troubleshooting

• No Power:
  - Check power connections (GND, VCC) for correct polarity and secure contact.
  - Verify the power supply is providing 12V DC (7V-16V) and at least 2A.
• No Sound:
  - Ensure speakers are correctly wired to L(+)L(-) and R(+)R(-).
  - Check speaker impedance and power rating compatibility.
  - Increase volume using VOL+ button or remote.
  - Confirm the correct input mode is selected (Bluetooth, USB, TF, FM, LINE IN).
• Bluetooth Not Connecting:
  - Ensure the board is in Bluetooth mode.
  - Turn off and on Bluetooth on your mobile device.
  - Make sure no other device is currently paired with the board.
  - Try restarting both the board and your mobile device.
• USB/TF Card Not Playing:
  - Ensure the card/drive is inserted correctly.
  - Check if the audio files are in a supported format (MP3, WMA, WAV, APE, FLAC).
  - Verify the storage device is not corrupted or empty.
• FM Radio Reception is Poor:
  - Extend or adjust the position of the FM antenna (if applicable, usually a wire connected to the board).
  - Move the device away from sources of interference.
• Microphone Not Working:
  - Ensure the microphone is securely plugged into the 6.5mm MIC jack.
  - Check the microphone's functionality with another device if possible.

9. User Tips

• For optimal sound quality, use high-quality audio files and speakers that match the amplifier's power output.
• When using the recording function, ensure your USB drive or TF card has sufficient free space.
• If experiencing issues with the remote control, check battery levels and ensure a clear line of sight to the IR receiver.
• Consider adding a small heatsink to the amplifier chip if operating at high volumes for extended periods, especially in enclosed spaces, to prevent overheating.

10. Warranty and Support

For warranty information or technical support, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.