VHM-314 Pro Bluetooth 5.0 MP3 Decoder Board – Lossless Audio Amplifier for Car Speaker Upgrade (High-Power Circuit Board) (Pro version)

SKU: FA2006-3-0
Product Model

VHM-314 Pro
Bluetooth Version

5.0
Audio Output

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

DC 3.7V ~ 5V (Micro USB, Type-C, or solder pads)
Transmission Distance

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

90dB
Total Harmonic Distortion (THD+N)

-70dB
Crosstalk

-86dB
Dynamic Range (DNR)

91dB
Supported Profiles

A2DP/AVCTP/AVDTP/AVRCP/HFP
The VHM-314 Pro Bluetooth 5.0 MP3 Decoder Board is a versatile, compact audio receiver module with added features like a microphone input, designed for upgrading existing audio systems to wireless Bluetooth 5.0 connectivity and supporting hands-free calls.
Description
The VHM-314 Pro Bluetooth 5.0 MP3 Decoder Board offers a simple yet powerful solution for transforming wired audio systems into modern, wireless setups. This “Pro” or “Deluxe” version differentiates itself from the standard model by including a built-in microphone and sometimes onboard control buttons, enabling hands-free calling functionality in applications like car audio systems. Utilizing the latest Bluetooth 5.0 technology, this module ensures a stable connection, faster transmission speeds, and high-fidelity, lossless audio reception (supporting formats like WAV, APE, FLAC, and MP3).
This board acts primarily 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 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. The board operates on a flexible power input range of 3.7V to 5V DC, suitable for standard USB power supplies (via Micro USB or Type-C port) or portable battery setups.
Features
  • Advanced Bluetooth 5.0: Ensures a stable connection, faster pairing, and high-quality, low-latency audio transmission.
  • Hands-Free Calling: Integrated microphone allows for speakerphone functionality, a key feature of the Pro version.
  • Lossless Audio Decoding: Supports high-fidelity audio formats including WAV, APE, FLAC, and MP3 for pristine sound quality.
  • Versatile Power Input: Flexible DC power input range (3.7V to 5V) via solder pads, Micro USB, or Type-C port, for use with various power sources.
  • Dual Output Interfaces: Features a standard 3.5mm stereo audio jack and dedicated 3-pin output pads for flexible connectivity.
  • Compact & Lightweight: Ultra-small form factor designed for easy integration into existing enclosures or tight spaces.
  • High Signal Quality: Boasts an impressive Signal-to-Noise Ratio (SNR) of 90dB and low Total Harmonic Distortion plus Noise (THD+N) of -70dB for clear audio.
  • Automatic Reconnection: Features an automatic reconnection function for a hassle-free audio experience.
Usage
Integrating the VHM-314 Pro board into an existing audio system is straightforward:
  1. Power Connection: Supply power to the board using a stable 3.7V-5V DC source via the Micro USB/Type-C port or by soldering wires to the dedicated pads. The blue LED indicator will light up and flash, indicating it is in pairing mode.
  2. Audio Connection: Connect the audio output (3.5mm jack or solder pads) to the input of an external amplifier or powered speakers. Ensure a common ground connection is established between all audio components.
  3. Pairing: On your smartphone or Bluetooth device, search for a new Bluetooth device (typically named “XY_BT” or “VHM-314”) and connect. The LED will remain solid blue once connected successfully.
  4. Playback/Hands-Free: Play audio wirelessly. If using the microphone for calls, your phone will automatically switch to the module’s microphone when a call is received and the device is paired
Q: Does the VHM-314 Pro version have a built-in power amplifier?

No, this board is an audio receiver/decoder only. It provides a line-level output signal and must be connected to an external power amplifier or active speakers to produce sound.

Q: What is the main difference between the standard VHM-314 and the Pro version?

The primary difference is the addition of a built-in microphone for hands-free calling capabilities in the “Pro” or “Deluxe” version

Q: Can I power the module with a lithium battery?

Yes, the board is designed to operate from a DC 3.7V-5V power supply, making it suitable for single-cell lithium batteries

Q: Is the connection voice prompt very loud?

User reviews note that the power-on and connection voice prompts can be very loud and the volume is not adjustable from the module itself. You should manage the initial volume on your connected amplifier or headphones carefully

Q: What audio formats does it support?

The board supports several audio formats for lossless decoding, including MP3, WAV, FLAC, and APE.

Related products