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Specification
Brand : Mavaol
BulletPoint1 : Convenience – Enjoy seamless audio streaming with Bluetooth 4.2 support, offering up to 20 meters of connectivity range for easy, long-distance music enjoyment.
BulletPoint2 : Versatile Power Options – Power the amplifier via a 5V USB, a 5V supply, or a 3.7V lithium battery, providing flexibility to fit your setup and charging preferences.
BulletPoint3 : High-Quality Sound Output – Experience crisp, stereo sound with support for 2-8 ohm speakers, and suitable for 4 ohm 5W speakers, delivering rich, full-bodied audio in any setting.
BulletPoint4 : USB Sound Card Functionality – Plug-and-play capability turns your module into a USB sound card, allowing easy connection to a computer for amplified music output, ideal for home or car use.
BulletPoint5 : Compact & Easy to Install – Simple to wire and install, with a bare board design for DIY enthusiasts; ideal for compact audio systems, car speakers, or custom audio setups.
BulletPoint6 : Remote Volume Control Ready: Compatible with optional remote master volume control for convenient adjustments
BulletPoint7 : User-Friendly Design: Rear-panel connector blocks simplify speaker connections and configuration
BulletPoint8 : True Loudness Contour Function: Enhances audio clarity on AUX channels for better sound
BulletPoint9 : Lo-Cut Filter: Reduces low-frequency noise on all microphone channels for cleaner audio output
Color : Multi
ConnectorGender : Female-to-Female
ConnectorType : HD15
IncludedComponents : Amplifier
ItemName : Mavaol Bluetooth Amplifier USB Sound Card, Stereo Audio Module, 5V 3.7V Battery Powered, for DIY Speakers Car Audio Portable Setup
ItemPackageDimensions_Height : 3 centimeters
ItemPackageDimensions_Length : 6 centimeters
ItemPackageDimensions_Width : 5 centimeters
ItemTypeKeyword : electronic-component-audio-amplifiers
Manufacturer : Mavaol
Material : Plastic
ModelName : Mavaolyhsdvo3f78
ModelNumber : Mavaolyhsdvo3f78
NumberOfItems : 1
PartNumber : Mavaolyhsdvo3f78
ProductDescription :
Item Type: Digital Amplifier Board
5V: The Positive Pole of the Power Supply is 5V
GND: Negative Pole of Power Supply
VBAT: Lithium Battery Anode 3.7-4.2V
L+ / L-: Left Channel Output (Directly Connected to the Speaker)
R+ / R-: Right Channel Output (Directly Connected to the Speaker)
Audio Output: Output Left and Right Channel Stereo Audio Signals, Which Can Be Connected to Two 2-8 Ohm and 3-5W Speakers Respectively, and 4 Ohm 5W Speakers Are Recommended for Storage.

Package List：
1 x Digital Amplifier Board

2 x Terminal
2 x Wire

Note:
1. Signal interference: The BT antenna is extremely susceptible to interference from high‑frequency or strong electromagnetic signals. Please place it as far away as possible from devices such as transmitters. And the board can not be close to metal objects, keep a certain distance.
2. If there is current noise on the power amplifier board, the cause is caused by ground wire interference. It is recommended that you do not use plug‑in wires at the output of the BT module, but must be soldered, especially the ground wire, and the wire should not be too long, the shorter the better , Try to be thicker. The audio ground must be connected to the ground of the audio input terminal of the power amplifier. This ground point can be welded in different positions to achieve the lowest current sound. It is recommended that the BT and the power amplifier board be powered separately, and the BT ground and the power amplifier ground are isolated.
Since this product is a bare board design, try not to touch the components on the board with your hands, which may cause static electricity to kill the chip and cause burnout.
3. Warning: The charging interface of this product is a current‑limiting charging mode, without charging management! For the safety of your life and property, please be sure to use a lithium battery with a protective plate produced by a regular
ProductSiteLaunchDate : 2025-02-03T23:17:25.860Z
Size : 3.00X2.90X0.50CM
Style : Modern
SupplierDeclaredDgHzRegulation : not_applicable
SupplierDeclaredHasProductIdentifierExemption : 1
UnitCount : 1
UnspscCode : 52161547
WarrantyDescription : No Warranty