1203BB DC Motor Speed Controller — precise PWM control for 6–28 V DC motors Key benefits Smooth, precise speed control: PWM regulation lets you set motor speed accurately without stalling or hunting. Wide compatibility: works with any DC power source from 6–28 V and motors or devices drawing up to 3 A (continuous), supporting a maximum output power of 80 W. Safer operation: built-in 3 A fuse protects the controller and load from overcurrent conditions. Simple integration: connects inline between a DC power supply and the motor or load for immediate speed control. What it does and why you need it Provides reliable pulse-width modulation (PWM) speed control for DC motors, fans and small pumps, letting you match output to the task for quieter, more efficient operation. Prevents overspeed and excessive current draw by limiting continuous output to 3 A and total power to 80 W, protecting both your motor and power source. Improves performance and flexibility of existing equipment without replacing motors or complex wiring. Technical highlights Input voltage range: DC 6–28 V Maximum continuous output current: 3 A Maximum output power: 80 W Control method: PWM (pulse width modulation) Built-in 3 A fuse for overcurrent protection Typical applications and scenarios Fan speed control: reduce noise and power use in ventilation or cooling systems by tuning fan RPM to actual needs. Aquarium oxygen pump regulation: lower pump speed at night or when less oxygenation is required to reduce noise and wear. Hobby and small motor projects: adjust speed for small DC motors in robotics, model making, or other DIY applications to match load and extend motor life. Practical notes Intended for DC motors and DC devices only; not suitable for AC motors. Do not exceed the 3 A continuous current or 80 W maximum power rating to avoid blowing the internal fuse or damaging the controller. Install inline between your DC power source and the motor; ensure correct polarity and secure connections. This 1203BB controller delivers safe, flexible PWM speed control for a wide range of low-voltage DC applications where precise speed adjustment and reliable protection are required.