{"product_id":"jmx-fn03-u1-2-3-step-fan-speed-control-mini-rechargeable-fan-circuit-3-7v-4-2v-small-fan-motherboard-low-voltage-fan-circuit-3-7v-circuit-rechargeable-circuit-with-3-level-speed-control-for-18650-battery-3-7v-battery","title":"Jmx-fn03-u1.2 3 Step Fan Speed Control Mini Rechargeable Fan Circuit 3.7v-4.2v Small Fan Motherboard Low Voltage Fan Circuit 3.7v Circuit Rechargeable Circuit With 3 Level Speed Control For 18650 Battery 3.7v Battery","description":"\u003cp\u003e \u003cmeta content=\"width=device-width,initial-scale=1\" name=\"viewport\"\u003e\u003cmeta content=\"JMX-FN03-U1.2: compact PWM dimmer for brushed DC motors and a 3.7V single-cell charger controller. Not a boost converter (no coil).\" name=\"description\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShort description:\u003c\/strong\u003e Compact PWM dimmer for brushed DC motors and a controller for 3.7V single-cell battery charging — \u003cem\u003enot\u003c\/em\u003e a boost converter (no coil\/inductor).\u003c\/p\u003e\n\u003cp\u003eThe JMX-FN03-U1.2 is a compact PWM controller designed for motor speed control and simple 3.7V single-cell charge-control tasks. It outputs a pulse-width-modulated signal for smooth, efficient control of brushed DC motors and can be used in basic battery charging arrangements when paired with proper current limiting and protection. This board is \u003cstrong\u003enot\u003c\/strong\u003e a boost converter — it contains \u003cem\u003eno coil\/inductor\u003c\/em\u003e and will not raise voltage.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"912\" height=\"513\" src=\"https:\/\/www.youtube.com\/embed\/GKfRyPMsqyE\" title=\"Mini Speed Controller Circuit Test for 3 7V DC Fan and Light | Full Review  | How It Works\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch2\u003eKey features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTrue PWM dimmer for brushed DC motors — smooth speed control when used with an appropriate MOSFET or switch.\u003c\/li\u003e\n\u003cli\u003eSuitable for 3.7V single-cell battery charge-control with external current limiting and protection.\u003c\/li\u003e\n\u003cli\u003eNot a boost converter — contains no coil\/inductor; does not step up voltage.\u003c\/li\u003e\n\u003cli\u003eCompact PCB for easy embedding in small projects and enclosures.\u003c\/li\u003e\n\u003cli\u003eSimple integration — add current limiting, charge-termination, and protection circuitry for safe charging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical summary\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eModel: JMX-FN03-U1.2\u003c\/li\u003e\n\u003cli\u003eFunction: PWM motor dimmer \u0026amp; 3.7V charger controller\u003c\/li\u003e\n\u003cli\u003eTarget voltage: single-cell 3.7V (Li-ion \/ LiPo)\u003c\/li\u003e\n\u003cli\u003eTopology: PWM switching (no coil \/ not a boost converter)\u003c\/li\u003e\n\u003cli\u003eForm factor: compact PCB — verify dimensions before installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eUsage notes \u0026amp; safety\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIntended for PWM control and basic charge-control — not a full-featured smart charger. Use current limiting and battery protection when charging.\u003c\/li\u003e\n\u003cli\u003eDo not expect voltage boost — use a proper boost converter to step up voltages.\u003c\/li\u003e\n\u003cli\u003eRecommended for hobby\/DIY projects; verify wiring and test with a reliable power source and protection equipment before deployment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- SEO meta copy for marketplaces --\u003e\u003c!-- Title: JMX-FN03-U1.2 \u0026mdash; PWM Motor Dimmer \u0026 3.7V Charger Controller --\u003e\u003c!-- Meta description: Compact PWM dimmer for brushed DC motors and a controller for 3.7V single-cell battery charging. Not a boost converter (no coil). --\u003e","brand":"Digilog Electronics","offers":[{"title":"Default Title","offer_id":43962612416577,"sku":"b649","price":35.0,"currency_code":"PKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0727\/2805\/1777\/files\/5V1AMicroUsb18650LithiumBatteryChargingBoardChargerModule.jpg?v=1779582220","url":"https:\/\/stem.pk\/products\/jmx-fn03-u1-2-3-step-fan-speed-control-mini-rechargeable-fan-circuit-3-7v-4-2v-small-fan-motherboard-low-voltage-fan-circuit-3-7v-circuit-rechargeable-circuit-with-3-level-speed-control-for-18650-battery-3-7v-battery","provider":"stem.pk","version":"1.0","type":"link"}