VHM-314 Bluetooth 5.0 MP3 Decoder Board – Lossless Audio Receiver, Car Speaker Amplifier Circuit, XY-BT-Mini Upgrade (Wireless Stereo Amp Module)

SKU: FA2006-2
Product Model

VHM-314
Bluetooth Version

5.0 (compatible with 4.2, 4.1, etc.)
Audio Output

Stereo Audio (3.5mm jack + 3-pin pads)
Power Input

DC 3.7V ~ 5V (Micro USB port or solder pads)
Transmission Distance

Up to 15 meters (line of sight)
Signal-to-Noise Ratio (SNR)

90dB
Total Harmonic Distortion (THD+N)

-70dB
Dimensions

Approx. 30mm x 30mm x 3mm
Weight

Approx. 4g
The VHM-314 Bluetooth 5.0 MP3 Decoder Board is a compact, high-quality lossless audio receiver designed to easily add wireless audio streaming capabilities to existing speaker systems, amplifiers, or DIY audio projects. It serves as an excellent upgrade to older XY-BT-Mini models, offering enhanced Bluetooth connectivity and superior sound fidelity.
Description
The VHM-314 Bluetooth 5.0 MP3 Decoder Board offers a simple yet powerful solution for transforming wired audio systems into modern, wireless setups. Utilizing the latest Bluetooth 5.0 technology, this module ensures a stable connection, faster transmission speeds, and high-fidelity, lossless audio reception within an effective range of up to 15 meters.
This board acts purely as an audio receiver and decoder; it does not include an integrated power amplifier, meaning it must be connected to an external amplifier or active speakers for sound output. Its primary function is to receive audio signals wirelessly and output a standard 3.5mm stereo audio signal and 3-pin output pads for easy integration.
Designed for convenience and versatility, the VHM-314 operates on a flexible power input range of 3.7V to 5V DC, making it ideal for both portable, battery-powered projects and standard 5V USB power supplies. The compact size and simple 3-wire connection (Power+, Power-, and Audio Out) make it perfect for discreet installations in car stereos, home theater systems, or custom-built speakers. It is a cost-effective solution for both personal DIY enthusiasts and businesses looking to integrate reliable wireless audio into their products.
Features
  • Advanced Bluetooth 5.0: Ensures a stable connection, faster pairing, and high-quality, low-latency audio transmission.
  • Lossless Audio Decoding: Supports various high-fidelity audio formats to deliver clear and rich sound quality.
  • Wide Compatibility: Works with all Bluetooth-enabled devices, including smartphones, tablets, and computers.
  • Versatile Power Input: Flexible DC power input range (3.7V to 5V), suitable for USB power or single-cell lithium batteries.
  • Dual Output Interfaces: Features a 3.5mm stereo audio jack and dedicated 3-pin output pads for flexible connectivity options.
  • Compact & Lightweight: Ultra-small form factor designed for easy integration into existing enclosures or tight spaces.
  • Simple Operation: Automatic pairing mode upon power-up with a blue LED indicator light.
Usage
Integrating the VHM-314 board into an existing audio system is a straightforward process:
  1. Power Connection: Supply power to the board via the Micro USB port or by soldering a 3.7V-5V DC source to the designated Power+ and Power- pads. A blue LED will light up and flash rapidly when in pairing mode.
  2. Audio Connection: Connect the audio output (either the 3.5mm jack or the 3-pin pads) to the input of an external amplifier or active speakers. Ensure proper grounding (GND) is maintained between the boards to avoid hum or noise.
  3. Pairing: On your smartphone or Bluetooth device, search for a new Bluetooth device named “VHM-314” or a similar identifier.
  4. Playback: Once paired, the LED will stop flashing and remain solid blue. You can now play audio wirelessly through your connected speaker system.
Q: Does this board have an amplifier built-in?

No, the VHM-314 is only an audio receiver and decoder. It outputs a low-level audio signal that must be connected to an external power amplifier or powered speakers to produce audible sound.

Q: What is the recommended power supply for this module?
A stable 5V DC power supply is recommended, typically via a standard Micro USB cable and phone charger. You can also use a 3.7V lithium battery for portable projects. Ensure the power source is clean and free of excessive noise, as this can affect audio quality.
Q: Why do I hear a buzzing or humming sound (noise floor) when connected?

This is often caused by a ground loop issue between the power supplies of the receiver board and the external amplifier. Ensure both devices share a common, single ground point. Using an isolated DC-to-DC power converter or a ground loop isolator on the audio line may resolve the issue

Q: Can I connect this to a car stereo?

Yes, provided your car stereo has an AUX input. You would power the VHM-314 using a regulated 5V supply (like a USB car adapter) and connect the 3.5mm audio jack to the car’s auxiliary input port.

Q: What is the difference between this and the XY-BT-Mini?

The VHM-314 is a direct upgrade featuring Bluetooth 5.0, offering improved connectivity stability, faster pairing, and generally better signal integrity compared to older Bluetooth 4.2 models like the original XY-BT-Mini.

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