Universal DC Motor Speed Controller (PWM) — 12V–40V, 10A, B100K potentiometer Why this controller helps Provides reliable PWM speed control for DC motors and other DC loads, allowing precise adjustment of motor speed without changing supply voltage. Delivers a continuous 10A output so small-to-medium DC motors can run under varying loads while maintaining torque and minimizing overheating. Compact design and efficient thermal behavior reduce installation space and cooling requirements in machines and projects. Key features and benefits Function: Pulse width modulation (PWM) speed controller for DC motors and DC loads. Voltage compatibility: DC 12V–40V — supports a wide range of 12V to 40V systems. Current rating: Maximum continuous current 10A. Potentiometer: B100K for manual speed adjustment; turning the knob clockwise increases duty cycle (higher speed). Physical size: 60 × 55 × 30 mm (L × W × H) — compact and easy to mount. Thermal performance: Engineered for high efficiency, steady torque, and low heat build-up; includes a heat sink — avoid contact between wiring and heat sink. Industrial-grade updates: Multiple iterative upgrades improve reliability for industrial and production use. Installation and operation notes Adjust speed with the potentiometer knob; clockwise rotation increases motor speed (duty cycle). Ensure wiring does not touch the heat sink to prevent short circuits or damage. Suitable for continuous operation up to the specified 10A; stay within the 12V–40V voltage range. Practical applications (examples) Conveyor or production line speed control in small industrial equipment where stable torque and adjustable speed are required. Fan, pump, or blower speed regulation in HVAC or cooling systems powered by DC supplies. Hobby and robotics projects that use 12V–40V DC motors and need manual speed adjustment. Package contents 2 × DC motor speed controllers (PWM, DC 12V–40V, 10A, potentiometer B100K) Specifications (concise) Voltage: DC 12V–40V Maximum current: 10A (continuous) Potentiometer resistance: B100K Dimensions: 60 × 55 × 30 mm (L × W × H) Quantity: 2 units per package Follow safe wiring and mounting practices and operate within the specified voltage and current limits to ensure reliable performance.