DC 5V/3.7V TWS Stereo Bluetooth Power Amplifier Board 2×10W Dual-Channel Adjustable and Rechargeable Power Amplifier Board

Product Features:1. Stereo dual-channel, dual-mode input via Bluetooth sound card2. Bluetooth 5.1 wireless connection, ensuring stable transmission of stereo audio signals3. Supports 2×10W output, providing powerful drive for 4Ω speakers4. Supports dual power supply options: 3.7V battery and DC 5V, offering flexible adaptation to various scenarios5. Suitable for portable speakers and DIY Bluetooth audio projectsProduct Specifications:Chip Type: StereoNumber of Channels: 2-channelAudio Input: Wireless Bluetooth / Wired sound cardPower Supply: 3.7V battery / DC 5V (Note: Voltage must not exceed 5V)Speakers: Compatible with 4Ω speakers (2Ω speakers cannot be used)Bluetooth Version: 5.1Output Power: 2 × 10W (peak distortion power up to 2 × 10.6W)Output Impedance: 4ΩPower Consumption (On/Standby): Less than 35mAPower Consumption (Off/Standby): Less than 25µACharging Current: 0.8 ± 0.1ATemperature Rise During Charging: 3,000 mAh battery life reference (with dual 4Ω speakers and default EQ): at half volume, standard tracks > 20 hours; at maximum volume, standard tracks > 8 hoursMobile phone Bluetooth connection range: ≥ 10 metres in a non-metallic, enclosed environmentCodec: Basic SBCProtection mechanisms: Over-temperature and over-current protectionMainboard dimensions: 39 × 46 mm; thickness: 12 mmProduct Notes:The use of hot-melt adhesive is strictly prohibited.For the socket-mounted charging indicator light: if the light is not red, the red LED on the mainboard must be removed for it to illuminate. Furthermore, the charging indicator light will not switch off once the battery is fully charged.If you wish for the light to switch off upon full charge, you must connect a wire across the two terminals of the red LED on the mainboard.You must use a 3.7V battery with an overcurrent rating of 5A or higher and equipped with a protection circuit. Otherwise, the battery will trigger protection at maximum volume.When used without a battery and powered via a 5V 3A mains adapter, the volume must not exceed 50 per cent, otherwise the device will reboot.The amplifier’s signal-to-noise ratio is 67; this means that at very low volumes, white noise may be audible when your ear is approximately 10 centimetres from the speaker. If this is a concern, please do not purchase.The sound tuning software does not support Windows 7 or earlier operating systems.Supports expansion with up to 30 x 5V RGB LEDs.Hidden volume up/down solder pads.Capable of charging the battery.Powered by a single power batterySupports EQ adjustment and saving via computer10-band EQ gain with DRC dynamic compressionPower button (single press to turn on, long press to turn off, triple press for TWS pairing, quadruple press to clear TWS pairing)M button (single press to switch lighting modes, double press for next track, triple press for previous track, long press to switch between sound card and Bluetooth)Integrally moulded inductor with black-gold capacitorsNote: Regarding background noise – please do not purchase if this is a concern① High-sensitivity speaker② In a quiet environment, at a distance of less than 30 cm when held vertically③ A faint hissing white noise may be audible at minimum volumePower supply requirements:1. Battery input: 3.3–4.2 V. The current from the battery connector to the main board must meet the following requirements: continuous discharge of 5 A, peak discharge of 8 A. For example, a 2000 mAh 5C battery or a 3000 mAh 3C battery.Battery protection board: Must have at least four 8-pin MOSFETs.2. Connect the adjustable power supply to the battery socket; the voltage must be between 3.3 V and 4.2 V, and the current must exceed 14 A to meet the peak load requirements.3. The device will not power on without a battery.Battery cable requirements: The cable must be thicker than No. 22 gauge, and the length must be less than 200 mm (Frequently Asked Questions:① Causes of loud noises, reboots, stuttering or shutdowns: Insufficient power supply — please refer to the power supply requirements and verify the parameters of the battery, protection board and battery cable. (Note: Currently, in 1 in 3,000 cases, high speaker volume causes the mainboard to reboot; this is due to very fine copper wire costing just over one yuan.) Apart from this, there are no other known causes.② How to pair? — Disconnect your mobile phone, switch on the speaker, and quickly press the power button three times to initiate pairing — wait 10 seconds and rescan for a Bluetooth connection. The left channel initiates pairing. Pressing the button four times cancels pairing.③ The sound seems very quiet —— This is extremely rare. The mobile phone’s Bluetooth volume synchronisation function must be enabled — Settings > Bluetooth > Advanced > tick ‘VolumeSynchronisation’ or ‘Absolute Volume’, or connect a tactile switch to the volume pad reserved on the main board for control.Product list:1x module2x speaker wires (optional)