VHM-314 Bluetooth 5.0 MP3 Decoder Board – Lossless Audio Amplifier Circuit for Car Speaker Upgrade (Black PCB)

SKU: FA2006-3
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
PCB Color

Black
The VHM-314 Bluetooth 5.0 MP3 Decoder Board (Black PCB) is a compact, high-fidelity wireless audio receiver module designed to seamlessly add Bluetooth streaming capabilities to existing audio systems, car speakers, or DIY amplifier projects.
Description
The VHM-314 Bluetooth 5.0 MP3 Decoder Board is an essential component for modernizing audio equipment. This black PCB version utilizes advanced Bluetooth 5.0 technology, ensuring a robust, high-speed connection and the transmission of lossless audio signals for superior sound quality. This module functions as an audio receiver and decoder, providing a standard stereo output signal (via a 3.5mm jack or solder pads) that must be connected to an external amplifier or powered speakers for audible sound.
Designed for ease of integration, the VHM-314 operates within a versatile DC power range of 3.7V to 5V, making it highly compatible with standard USB power sources or portable lithium-ion batteries. Its ultra-compact form factor makes it ideal for discreet installation inside speaker enclosures, vehicle dashboards, or existing stereo units. With an effective range of up to 15 meters, users can enjoy the convenience of wireless music streaming from their smartphones, tablets, or computers without compromising audio fidelity.
Features
  • Advanced Bluetooth 5.0: Ensures a stable connection, faster pairing, and high-quality, low-latency audio transmission.
  • Lossless Audio Decoding: Supports 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 (Black PCB for sleek look).
  • 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: Is there any password required for Bluetooth pairing?

No, the VHM-314 module automatically enters pairing mode when powered on and does not require a password to connect.

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