{"product_id":"bluetooth-amplifier-board-aux-audio-input-power-amplifier-board-3-7v","title":"Bluetooth Amplifier Board AUX Audio Input Power Amplifier Board 3.7V","description":"\u003cp\u003eIn this review the author tested the Bluetooth Amplifier Board to see if it delivers usable audio power for DIY speaker projects. The board is clearly aimed at hobbyists and small speaker builders who need a compact, low-voltage solution: it uses \u003cstrong\u003eBluetooth 5.0\u003c\/strong\u003e and runs from a 3.7V lithium cell or a 4.5 to 5V regulated supply. The single biggest reason to buy is straightforward: it can drive two small speakers with up to 5W per channel when provided with adequate current, giving an easy way to add wireless input and modest amplification into battery-powered enclosures.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth 5.0:\u003c\/strong\u003e Provides a modern wireless input with reliable pairing and lower latency than older modules, useful for streaming from phones or media players.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow voltage operation:\u003c\/strong\u003e Runs from DC 3.7V to 5V so it integrates directly with single-cell lithium batteries or common 5V regulators for portable designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfigurable output:\u003c\/strong\u003e The board can be set up to provide two channels at 5W each when fed with sufficient current and matched 4 ohm speakers, enabling a stereo pair in a compact PCB form.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal amplifier option:\u003c\/strong\u003e Has an OUT audio output on a 3P block for easy modification to drive a larger external power amplifier if more volume is needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHands-free and button support:\u003c\/strong\u003e Supports call handling and external button connections for play\/pause and track control in integrated speaker builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicro power switch control:\u003c\/strong\u003e Simple onboard switching makes power management straightforward for battery-powered projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis board is best for electronics hobbyists, makers and small-scale speaker builders who want a compact Bluetooth front end with modest amplification for DIY projects. It fits projects where space is limited and where a single lithium cell or a 5V regulator is the intended power source.\u003c\/p\u003e\n\u003cp\u003eIt is less suitable for audiophiles or anyone who needs high-fidelity, high-power output for large rooms. Buyers who require more than 5W per channel or very low distortion should pair this board with an external amplifier via the provided OUT terminals or choose a higher-power amplifier module instead.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompact PCB design makes it easy to fit inside small enclosures and custom speaker boxes.\u003c\/li\u003e\n\u003cli\u003eWorks from a single-cell lithium battery or a 5V supply, simplifying portable builds.\u003c\/li\u003e\n\u003cli\u003eIncludes Bluetooth 5.0 and hands-free support, adding modern wireless convenience and call handling.\u003c\/li\u003e\n\u003cli\u003eOUT audio output lets builders expand to an external amplifier when more power is needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRequires a robust power source (1.5A to 2A or higher) to reach full output, so battery selection and wiring matter.\u003c\/li\u003e\n\u003cli\u003eNot intended as a high-end audio solution; sound quality is appropriate for casual listening and portable use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSanpyl\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003eDC 3.7V to 5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent\u003c\/td\u003e\n\u003ctd\u003e1.5A to 2A (recommended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax power\u003c\/td\u003e\n\u003ctd\u003e10W total (5W x 2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePCBA size\u003c\/td\u003e\n\u003ctd\u003eapprox. 40 x 34 x 9mm (including terminal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage weight\u003c\/td\u003e\n\u003ctd\u003eapprox. 40 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Bluetooth Amplifier Board is a practical, affordable module for DIY speakers and portable audio projects that need wireless input and modest output. It offers modern \u003cstrong\u003eBluetooth 5.0\u003c\/strong\u003e, simple battery operation and an option to feed an external amplifier, making it good value for makers who prioritize compact size and flexibility over high-end sound.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat battery voltage does it need?\u003c\/strong\u003e\u003cbr\u003eThe board runs on a single-cell lithium battery at 3.7V or a regulated 4.5 to 5V supply; ensure the battery can deliver 1.5A to 2A for two speakers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I connect larger speakers?\u003c\/strong\u003e\u003cbr\u003eYou can use the OUT audio terminals to feed an external power amplifier for larger speakers; the onboard amp is designed for 4 ohm small speakers up to 5W per channel.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it support call controls?\u003c\/strong\u003e\u003cbr\u003eYes, the module supports hands-free calling and external button connections for basic playback and call functions.\u003c\/p\u003e","brand":"Sanpyl","offers":[{"title":"Default Title","offer_id":46778548191451,"sku":"B085DQN84S","price":11.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61aZ7bMQ5tL._SL1001.jpg?v=1747855356","url":"https:\/\/gearmusthave.com\/products\/bluetooth-amplifier-board-aux-audio-input-power-amplifier-board-3-7v","provider":"GearMustHave","version":"1.0","type":"link"}