Product Overview
The Acxico VHM-314 is a compact Bluetooth 5.0 audio receiver board designed for DIY audio projects. It supports MP3 lossless decoding and provides dual-channel stereo audio output.
Key Features
- Bluetooth 5.0 connectivity (backward compatible with Bluetooth 4.1 and below)
- MP3 lossless audio decoding
- Dual-channel stereo audio output
- Power supply voltage: DC 3.7-5V
- Micro USB power input or 2.54mm pin port
- 3.5mm audio jack output
Package Contents
- 2 x Acxico VHM-314 Bluetooth Audio Receiver Board 5.0
Image: The Acxico VHM-314 Bluetooth Audio Receiver Board, showcasing its compact design and various connection points.
Safety Information
Important: Installation of electronic modules requires basic knowledge and a certain level of electronic professional foundation and hands-on ability. Please proceed with caution.
- Ensure the power supply voltage is within the specified range (DC 3.7-5V) to prevent damage.
- Avoid short-circuiting the power terminals.
- Keep the board away from moisture and extreme temperatures.
- Handle the board by its edges to avoid damaging components.
Setup
Component Identification
Image: A detailed diagram of the VHM-314 board, indicating the Bluetooth antenna, power supply input (3.7-5V), Micro USB port, negative power supply, ground, left channel, and 3.5mm dual-channel headphone jack.
Power Supply Connection
The VHM-314 board can be powered via two methods:
- Micro USB Port: Connect a standard Micro USB cable to the Micro USB port on the board and to a DC 3.7-5V power source.
- 2.54mm Pin Port: Use the designated 2.54mm pin ports for DC 3.7-5V power input. Ensure correct polarity: connect the positive (+) terminal to the 'BAT+' pin and the negative (-) terminal to the 'BAT-' pin or ground ('G').
Audio Output Connection
Connect your audio output device (e.g., headphones, amplifier, speakers) to the 3.5mm dual-channel headphone jack on the board. The output provides stereo audio.
For custom connections, the 'L', 'G', and 'R' pins provide Left, Ground, and Right audio channels respectively, which can be connected to an external amplifier.
Operating Instructions
Bluetooth Pairing
- Power On: Once the board is powered, a blue LED indicator will illuminate, signifying it is ready for pairing.
- Search for Device: On your mobile phone or other Bluetooth-enabled device, search for available Bluetooth devices. The board will appear as "BM3".
- Connect: Select "BM3" from the list. If prompted for a password, enter "1688".
- Confirmation: A successful connection is typically indicated by an audible tone or a change in the LED indicator's behavior (e.g., solid blue).
Audio Playback
Once successfully paired, any audio played on your connected device will be transmitted wirelessly to the VHM-314 board and output through the 3.5mm audio jack.
- Adjust volume directly from your connected Bluetooth device.
- The board supports MP3 lossless decoding for high-quality audio.
Specifications
| Feature | Detail |
|---|---|
| Model Number | VHM-314 (Internal: YY385) |
| Brand | Acxico |
| Bluetooth Version | 5.0 (Supports 4.1 and below) |
| Bluetooth Name | BM3 |
| Bluetooth Password | 1688 |
| Power Supply Voltage | DC 3.7-5V |
| Power Supply Interface | Micro USB port or 2.54mm pin port |
| Audio Output | 3.5mm dual-channel headphone jack, L/G/R pins |
| Audio Output Mode | Stereo (2 Channel) |
| Audio Decoding | MP3 Lossless |
| Communication Distance | 3-12 meters (environment dependent) |
| Compatible Devices | Smartphone, Speaker |
| PCB Thickness | 1.6mm |
| Item Weight | 0.02 Kilograms |
Image: The VHM-314 board with approximate dimensions of 30mm x 30mm (1.18 inches x 1.18 inches).
Troubleshooting
- No Power: Ensure the power supply is connected correctly and provides 3.7-5V DC. Check Micro USB cable or pin connections for proper polarity.
- Cannot Pair: Make sure the board is powered on and the blue LED is active. Ensure your device's Bluetooth is enabled and within range (3-12 meters). Try restarting both the board and your device. Confirm the Bluetooth name "BM3" and password "1688".
- No Audio Output: Verify the 3.5mm audio jack connection to your speakers/headphones. Check the volume level on your connected Bluetooth device. Ensure the device is successfully paired and playing audio.
- Poor Audio Quality: Ensure your Bluetooth device is within optimal range. Reduce interference from other wireless devices.
- Intermittent Connection: Move closer to the board. Avoid physical obstructions between the board and your Bluetooth device.
Maintenance
The Acxico VHM-314 Bluetooth Audio Receiver Board requires minimal maintenance.
- Keep the board clean and free from dust. Use a soft, dry cloth for cleaning.
- Avoid exposing the board to liquids or excessive humidity.
- Store the board in a dry, cool environment when not in use.
- Do not attempt to modify the board's circuitry, as this may void any implied warranty and cause damage.
Warranty and Support
Acxico products are designed for reliability and performance. While specific warranty details are not provided in this manual, please retain your proof of purchase for any warranty claims.
For technical support or inquiries regarding your Acxico VHM-314 Bluetooth Audio Receiver Board, please contact your retailer or the manufacturer directly through their official support channels.
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