"Tiny Cooling Fan" DIY small production technology gizmos small production puzzle handmade scientific electronic light control fan kit materials, the products involved in light control, electric and other knowledge principle, need-it-yourself wiring. Suitable for third grade students in science and technology over the production and experimentation. Electric light control "Tiny Cooling Fan" is realized by a fan switch light control circuit. The main components motor, impeller, switches, brackets, light control circuit boards and other components. When the sun or a flashlight illuminating light Control Manager, "Tiny Cooling Fan" circuit automatically turns to drive the high-speed rotating impeller wind the motor is energized to produce wind, accelerate heat dissipation, makes people feel cool. When there is no bright light, fan circuit automatically shut down, stop running.