{"product_id":"servo-power-adapter-7-4v-8-4v-3a-dc-5-5x2-1","title":"Servo Power Adapter 7.4 V \/ 8.4 V 3 A, DC 5.5×2.1 mm, 100–240 V, for 7.4 V Bus Servos and SO-ARM101 Leader Arm","description":"\u003cp\u003e\u003cstrong\u003eThis is a regulated 7.4 V (or 8.4 V) 3 A DC power adapter with a 5.5 × 2.1 mm barrel plug that replaces a 2S LiPo battery for bench-powering 7.4 V bus servos such as the Feetech STS3215-C001\/C044\/C046 used in SO-ARM101 leader arms, LeKiwi and OpenDuck builds.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA regulated 7.4 V (or 8.4 V) 3 A supply for the 7.4 V Feetech STS3215 servos used in SO-ARM101 leader arms, LeKiwi and OpenDuck builds. It replaces a 2S LiPo on the bench so you can run and calibrate servos all day from mains power. For 12 V servos and follower arms use a 12 V 5 A adapter instead.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePowering the 7.4 V leader arm of an SO-ARM101 \/ SO-101 pair\u003c\/li\u003e\n\u003cli\u003eBench testing and calibrating 7.4 V STS3215 servos before assembly\u003c\/li\u003e\n\u003cli\u003eRunning OpenDuck Mini or other 2S-servo robots from mains during development\u003c\/li\u003e\n\u003cli\u003e8.4 V version for projects that expect a fully charged 2S pack\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eLeRobot builders and robotics students who buy servos separately and need a safe supply for the 7.4 V models without draining LiPo packs.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFeetech STS3215 7.4 V models (C001, C044, C046) and other 6–8.4 V servos\u003c\/li\u003e\n\u003cli\u003eWaveshare Bus Servo Adapter, BusLinker V3.0, FE-URT-1 (barrel jack)\u003c\/li\u003e\n\u003cli\u003eNot for 12 V servos (STS3215-C018, STS3250): use a 12 V 5 A adapter\u003c\/li\u003e\n\u003cli\u003eMains plug: two flat pins (US \/ CA \/ JP \/ CN); use a travel adapter in EU \/ UK \/ AU\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eOutput\u003c\/th\u003e\n\u003ctd\u003e7.4 V DC 3 A (22 W) or 8.4 V DC 3 A (25 W), regulated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInput\u003c\/th\u003e\n\u003ctd\u003e100–240 V AC 50\/60 Hz, universal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePlug\u003c\/th\u003e\n\u003ctd\u003eDC 5.5 × 2.1 mm barrel, centre positive, 1.5 m cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMains plug\u003c\/th\u003e\n\u003ctd\u003eTwo flat pins (fits US \/ CA \/ JP \/ CN sockets; adapter needed for EU \/ UK \/ AU)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProtection\u003c\/th\u003e\n\u003ctd\u003eOver-current, over-voltage, short-circuit, over-temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCertification\u003c\/th\u003e\n\u003ctd\u003eCCC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUse\u003c\/th\u003e\n\u003ctd\u003eFeetech STS3215 7.4 V models (C001\/C044\/C046), SO-ARM101 leader arm, 2S servo projects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7.4 V 3 A (for 7.4 V servos):\u003c\/strong\u003e 1 × 7.4 V 3 A adapter with fixed mains cable and 1.5 m DC lead\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8.4 V 3 A (2S LiPo-equivalent):\u003c\/strong\u003e 1 × 8.4 V 3 A adapter with fixed mains cable and 1.5 m DC lead\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eWhich voltage do I need?\u003c\/h3\u003e\u003cp\u003e7.4 V for the 7.4 V STS3215 models and the SO-ARM101 leader arm; 8.4 V only if your controller expects a fully charged 2S pack. Never feed either to 12 V servos, and never feed 12 V to 7.4 V servos.\u003c\/p\u003e\u003ch3\u003eIs 3 A enough for six servos?\u003c\/h3\u003e\u003cp\u003eFor a leader arm that is moved by hand, yes: the servos are mostly reading position. For a 7.4 V follower doing real lifting, use two adapters or a 5 A supply.\u003c\/p\u003e\u003ch3\u003eDoes the plug fit my socket?\u003c\/h3\u003e\u003cp\u003eThe cable ends in a two-flat-pin plug used in the US, Canada, Japan and China; input is 100–240 V so it works anywhere with a simple plug adapter.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"7.4 V 3 A (for 7.4 V servos)","offer_id":50760955461871,"sku":"PSU-7V4-3A","price":23.0,"currency_code":"SGD","in_stock":true},{"title":"8.4 V 3 A (2S LiPo-equivalent)","offer_id":50760955494639,"sku":"PSU-8V4-3A","price":26.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_adapter.jpg?v=1789437173","url":"https:\/\/armdojo.com\/products\/servo-power-adapter-7-4v-8-4v-3a-dc-5-5x2-1","provider":"ArmDojo","version":"1.0","type":"link"}