1. Introduction
This manual provides instructions for the Arvin QCC5181/QCC3084 Bluetooth 5.4 Receive Amplifier Decoding Board. This versatile board functions as a high-fidelity audio receiver and digital-to-analog converter, supporting advanced Bluetooth codecs and offering multiple input/output options for integration into various audio systems.
Figure 1: Arvin QCC5181/QCC3084 Bluetooth 5.4 Receive Amplifier Decoding Board
2. Specifications
| Feature | Detail |
|---|---|
| Bluetooth Version | 5.4 (backward compatible with 5.3/5.1/4.2) |
| Bluetooth Codecs Supported | SBC, AAC, aptX, aptX LL, aptX HD, LDAC, aptX Adaptive, LHDC (QCC5181 supports LDAC) |
| Bluetooth Max Sampling Rate | 24-bit/192kHz (LDAC) |
| USB Max Sampling Rate | 24-bit/96kHz |
| Outputs | IIS (I2S), SPDIF (Coaxial) - simultaneous output with custom firmware |
| Inputs | Bluetooth, USB Audio, CD IIS, SPDIF In |
| Power Input | DC 5-20V (no distinction between positive and negative) |
| Dimensions (WxHxD) | 57.1mm x 32.7mm (approx. 2.25" x 1.29") |
| Weight | 50g |
| Compatible Equipment | Amplifiers, Digital-to-Analog Converters (DACs) |
Figure 2: Board dimensions (57.1mm x 32.7mm)
3. Setup and Connections
Carefully follow the instructions below for proper installation and connection of the decoding board. Ensure all power is disconnected before making any connections.
3.1 Component Identification
Figure 3: Board Component Layout
- M3 screw holes
- Remote control reception (optional)
- Bluetooth antenna
- Bluetooth module (QCC5125/QCC5171 - Note: Product uses QCC3084/QCC5181)
- Key control line (up and down, play, pause)
- USB sound card input
- IIS Input
- IIS Output
- Coaxial output
- Coaxial Input
- Bluetooth connection light (flashing when not connected, always on when connected)
- Power supply 5-12V (no distinction between positive and negative)
3.2 Wiring Diagram
Refer to the detailed wiring diagram for all electrical connections. Pay close attention to polarity where indicated, although the main power input is non-polar.
Figure 4: Detailed Wiring Diagram
- Power Input (DC IN): Connect 5-20V DC power. The board supports non-polarized input.
- Bluetooth Antenna (BT ANT 2.4G): Connect the included 2.4G Bluetooth antenna for optimal signal reception.
- Key Control (KEY VOL-, KEY VOL+, KEY PLAY): Connect external buttons for volume control and playback functions.
- USB Audio: Connect to a computer via USB for audio decoding.
- IIS Output (MCK OUT, BCK OUT, LRCK OUT, DATA OUT, GND): Standard 4-wire IIS output. If your decoding chip does not require MCK, it can be left unconnected.
- SPDIF Output (SPDIF OUT, GND): Connect to a coaxial digital input on your amplifier or DAC.
- SPDIF Input (SPDIF IN, GND): Connect external coaxial digital audio sources.
- Indicator Light (LED+, LED-): Connect an external LED for status indication.
Important Note on Input Switching:
The board supports switching between coaxial and IIS inputs using jump caps. However, any change to the jump cap configuration requires the board to be re-powered for the new setting to take effect.
4. Operation
4.1 Bluetooth Connection
- Ensure the board is powered on. The Bluetooth connection light (11 in Figure 3) will flash, indicating it is ready for pairing.
- On your source device (smartphone, tablet, etc.), search for Bluetooth devices. The Bluetooth name will be "QCC3084" or "QCC5181".
- Select the appropriate Bluetooth name to pair. Once successfully connected, the Bluetooth connection light will remain steadily on.
4.2 Input Priority and Automatic Switching
The board prioritizes Bluetooth input. If a Bluetooth connection is active, it will play audio from the Bluetooth source.
- If Bluetooth is not connected, the board can decode audio from the computer's USB input.
- If the Bluetooth connection is disconnected, the board will automatically switch to other available inputs, such as the sound card IIS or coaxial input.
4.3 Key Control
If external key control lines are connected (5 in Figure 3), you can use them to:
- Adjust volume (KEY VOL+, KEY VOL-)
- Control playback (KEY PLAY for play/pause)
5. Maintenance
To ensure the longevity and optimal performance of your decoding board, follow these maintenance guidelines:
- Keep Dry: Avoid exposing the board to moisture or liquids.
- Clean Gently: Use a soft, dry cloth to clean the board. Do not use harsh chemicals or abrasive materials.
- Handle with Care: Electronic components are sensitive. Avoid dropping the board or subjecting it to physical shock.
- Static Electricity: When handling the board, especially during installation, take precautions against static discharge (e.g., use an anti-static wrist strap).
- Ventilation: Ensure adequate airflow around the board if enclosed in a case to prevent overheating.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power/Board not turning on | Incorrect power supply voltage or connection. | Verify power input is within 5-20V DC. Check power cable connections. |
| Bluetooth not pairing/connecting | Bluetooth antenna not connected; board not in pairing mode; interference; already connected to another device. | Ensure Bluetooth antenna is securely connected. Check if the LED is flashing (pairing mode). Disconnect from other devices. Reduce distance to source. |
| No audio output | Incorrect output connection (IIS/SPDIF); wrong input selected; volume too low; connected device issues. | Check IIS/SPDIF wiring to your amplifier/DAC. Ensure the correct input is active (Bluetooth priority). Increase volume on source and receiving device. Test with different audio sources. |
| Input switching not working | Jump caps changed without re-powering. | After adjusting jump caps for coaxial/IIS input selection, power cycle the board. |
| SPDIF output voltage level | Uncertainty about signal specifications. | The SPDIF output adheres to standard digital audio specifications, typically 0.5Vp-p into a 75-ohm impedance. Ensure your receiving device is compatible with this standard. |
7. User Tips
- For the best audio quality, especially with high-resolution codecs like LDAC, ensure your source device also supports these codecs.
- When using the USB audio input, ensure your computer's audio settings are configured to output to the decoding board.
- Experiment with different power supplies within the 5-20V range to find the one that provides the most stable performance for your setup.
- If experiencing intermittent Bluetooth connection, try relocating the antenna or the board to a less obstructed area.
8. Warranty and Support
For warranty information, technical support, or any inquiries regarding your Arvin QCC5181/QCC3084 Bluetooth Decoding Board, please contact the seller directly. Keep your purchase records for reference.
Seller: BEAYEAU Store
