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NE555 and CD4017 based exhaust fan timing cycle controller circuit

Figure exhaust fan controller for the regular cycle, can be used to conduct regular family room exhaust fan cycle control, it can carry out regular cleaning of indoor air purification, but also eliminates the need for manual control. As long as the actual need to set a good exhaust time and intermittent time, exhaust fan will be in accordance with predetermined procedures and time, automatic cycle to their work. The controller can also set a good time according to the procedures and time, automatically cut off the power supply, both can achieve the control purpose, without wasting energy. Its composition as shown.

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NE555 and CD4017 based exhaust fan timing cycle controller circuit