{"product_id":"mono-bluetooth-power-amplifier-pcba-4ohm-3w-lithium-battery-charging","title":"Mono Bluetooth Amplifier PCBA – 4Ω 3W with Battery Charging","description":"\u003ch2\u003eMono Bluetooth Power Amplifier PCBA – 4Ω 3W with Integrated Lithium Battery Charging\u003c\/h2\u003e\n\u003cp\u003eTake your DIY audio projects to the next level with this compact \u003cstrong\u003eMono Bluetooth Power Amplifier PCBA\u003c\/strong\u003e. Delivering \u003cstrong\u003e3W of output power into a 4-ohm load\u003c\/strong\u003e, this surface-mount board integrates a Bluetooth module and a \u003cstrong\u003e3.7V lithium battery charging circuit\u003c\/strong\u003e all in one — making it ideal for building portable speakers, desktop audio devices, and custom electronics projects.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're a hobbyist, maker, or electronics engineer, this all-in-one amplifier board saves you hours of design time by combining wireless audio reception, amplification, and battery management on a single PCB.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Power:\u003c\/strong\u003e 3W mono into a 4Ω (ohm) load\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e 3.7V (compatible with standard single-cell lithium batteries)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Bluetooth Module:\u003c\/strong\u003e Wireless audio streaming built right onto the board\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOnboard Lithium Battery Charging:\u003c\/strong\u003e Charges your 3.7V Li-Ion\/LiPo battery directly from the board — no external charger needed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSMD Package:\u003c\/strong\u003e Compact surface-mount design for space-efficient builds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNew Condition:\u003c\/strong\u003e Ships brand new, ready for integration\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo High-Concern Chemicals:\u003c\/strong\u003e Clean, RoHS-compliant build\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDIY portable Bluetooth speakers\u003c\/li\u003e\n  \u003cli\u003eDesktop computer audio upgrades\u003c\/li\u003e\n  \u003cli\u003eCustom battery-powered audio devices\u003c\/li\u003e\n  \u003cli\u003eElectronics prototyping and maker projects\u003c\/li\u003e\n  \u003cli\u003eSTEM education and hobbyist builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3W\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eImpedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 Ohms (Mono)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.7V (Lithium Battery Input)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Charging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntegrated 3.7V Li-Ion\/LiPo Charging Circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWireless\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBluetooth Module Included\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSMD (Surface Mount Device)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.energystar.gov\/products\" target=\"_blank\" rel=\"noopener\"\u003eENERGY STAR product efficiency guidance\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What battery type is compatible with this Bluetooth amplifier PCBA?\u003c\/h4\u003e\n\u003cp\u003eA: This board is designed to work with standard 3.7V single-cell lithium-ion (Li-Ion) or lithium polymer (LiPo) batteries. The integrated charging circuit manages safe charging directly on the board, so no external charger is required.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use this amplifier board to build a portable Bluetooth speaker?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. The board combines a Bluetooth audio receiver, a 3W mono amplifier (4Ω), and a lithium battery charger on one compact SMD PCBA — everything you need for a self-contained portable Bluetooth speaker build, minus the enclosure and speaker driver.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the maximum speaker impedance this board supports?\u003c\/h4\u003e\n\u003cp\u003eA: This amplifier PCBA is rated for a \u003cstrong\u003e4-ohm mono speaker load\u003c\/strong\u003e at 3W output. Using a speaker with different impedance may affect output power and performance, so a 4Ω speaker is recommended for optimal results.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What battery type is compatible with this Bluetooth amplifier PCBA?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This board is designed to work with standard 3.7V single-cell lithium-ion (Li-Ion) or lithium polymer (LiPo) batteries. The integrated charging circuit manages safe charging directly on the board, so no external charger is required.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use this amplifier board to build a portable Bluetooth speaker?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Absolutely. The board combines a Bluetooth audio receiver, a 3W mono amplifier (4Ω), and a lithium battery charger on one compact SMD PCBA — everything you need for a self-contained portable Bluetooth speaker build, minus the enclosure and speaker driver.\"}}, {\"@type\": \"Question\", \"name\": \"What is the maximum speaker impedance this board supports?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This amplifier PCBA is rated for a 4-ohm mono speaker load at 3W output. Using a speaker with different impedance may affect output power and performance, so a 4Ω speaker is recommended for optimal results.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/n8ande-60.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/n8ande-60.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Mono Bluetooth Amplifier PCBA – 4Ω 3W with Battery Charging\", \"item\": \"https:\/\/n8ande-60.myshopify.com\/products\/mono-bluetooth-power-amplifier-pcba-4ohm-3w-lithium-battery-charging\"}]}\u003c\/script\u003e","brand":"Axl","offers":[{"title":"Default Title","offer_id":44167214334039,"sku":"\u003cnone\u003e","price":13.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0676\/6008\/7383\/files\/S37d16ad6e3a64b38b38e32ed59e2d64ag.webp?v=1786759580","url":"https:\/\/axlcustomersupport.com\/products\/mono-bluetooth-power-amplifier-pcba-4ohm-3w-lithium-battery-charging","provider":"Axl","version":"1.0","type":"link"}