ขาย Dc 4V-12V 5W USB พัดลมระบายความร้อนความเร็วลม ราคาที่ดีที่สุด

USB fan speed regulator wind speed air volume regulator heat dissipation mute multi-stage office dormitory bedside mini Module highlights: USB fan air volume regulator! Strong wind and weak wind can be adjusted at will! USB fan stepless speed controller! Principle of fan speed regulation: The non-adjustable USB fan is a 5V direct-supply fan motor, and the two-speed fan has a booster circuit board inside. When placed in the second gear, the booster board raises the 5V of the USB. Connect the motor, the air volume will be large! The output voltage range of the stepless speed regulator smoothly changes from 2.5V to 8.0V, and the air volume can be set arbitrarily! And the scope is wider! Turn the knob clockwise to increase the air volume, turn it counterclockwise to decrease the air volume, and the knob has a switch function!