VHM-314 Bluetooth 4.1 Audio Decoder Board – Lossless Stereo Receiver Module (3.7V–5V) for DIY Bluetooth Speakers and Wireless Audio Upgrades

Parameter	Detailed Specification
Model	VHM-314
Bluetooth Version	4.1 (Backward compatible with 4.0/3.0)
Operating Voltage	3.7V to 5.0V DC
Audio Output	3.5mm Stereo Jack / Solder Pads
SNR (Signal-to-Noise Ratio)	90 dB
THD+N	-70 dB
Support Profile	A2DP / AVCTP / AVDTP / AVRCP / HFP
Transmission Distance	15m (Open Area)

Price

₹ 114.41

(Tax included)

Product Description

Transform any wired audio system into a wireless powerhouse with the VHM-314 Bluetooth 4.1 Audio Decoder Board. This ultra-compact module is designed for audiophiles and DIYers looking for a high-fidelity, lossless stereo receiver solution. It supports 3.7V Lithium battery power or 5V Micro-USB input, making it incredibly versatile for portable Bluetooth speakers or car audio upgrades. At Robogears, we recommend the VHM-314 for its superior signal-to-noise ratio and "lossless" decoding capabilities, ensuring that your wireless music remains crisp and undistorted. The board features an onboard status LED and a standard 3.5mm jack, allowing for immediate "plug-and-play" connectivity with headphones or external power amplifiers.

Detailed Key Features

Bluetooth 4.1 Lossless Decoding: Utilizes advanced 4.1 technology to provide stable, high-bitrate audio transmission with minimal latency and high fidelity.
Dual Power Input Modes: Can be powered via a 5V Micro-USB cable for stationary use or a 3.7V Lithium battery (using the dedicated solder pads) for portable projects.
Plug-and-Play Stereo Output: Includes a gold-plated 3.5mm audio jack for high-quality contact, along with L/R/Gnd solder pads for integrated permanent installations.
Onboard LED Status Indicator: Features a blue LED that flashes during pairing mode and stays solid when a successful connection is established.
Ultra-Miniature Footprint: Small enough to be embedded inside existing old speakers, headphones, or car dashboard panels without taking up significant space.

All Technical Details

Crosstalk Performance: -86 dB for excellent channel separation.
Power Protection: Includes basic voltage regulation to ensure stable decoding even as battery levels fluctuate.
Automatic Reconnect: Remembers the last paired device and connects automatically when powered on.
Decoding Format: Supports standard high-definition audio formats transmitted via A2DP profiles.
Interface: Standard Micro-USB (Power) + 3.5mm (Audio) + Battery Solder Pads.

Prototyping & Engineering Tips (Robogears Exclusive)

Ground Loop Noise: If you hear a "humming" or "whining" noise when using this in a car or with a shared power supply at your Pimpri workshop, it is likely a ground loop. Use an Isolated DC-DC Converter or a separate battery to ensure a crystal-clear audio signal.
Antenna Orientation: Avoid placing the module behind thick metal plates or large capacitors, as these can block the 2.4GHz Bluetooth signal and reduce the 15m range.
Battery Safety: When powering via the 3.7V pads, ensure you use a Li-ion battery with a protection circuit (BMS). The module itself does not have a battery charging circuit; it only draws power.
Amplifier Pairing: This module provides a "Line-Level" output. It can drive headphones directly, but for speakers, you must connect this to a power amplifier board (like a PAM8403 or TPA3116).

Package Includes

1 x VHM-314 Bluetooth 4.1 Audio Decoder Board

Image Disclaimer

Product images are shown for illustrative purposes only. The silkscreen (text on the PCB) or the color of the 3.5mm jack may vary depending on the hardware revision, though all technical specifications and the VHM-314 decoder type remain as described.

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