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Circulatory timing flashlight circuit diagram

2017-02-01 22:02  
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Circulatory timing flashlight circuit diagram
In accordance with the picture, the circulatory timing control circuit can be composed of very few components. The circuit is composed of MOS time base circuit 7555, CMOS decimal counter (pulse distributor) 4017 and last-stage VMOS power transistor. Power transistor can control lamp bulb of current up to 2A. The resistance Rave between the lamp bulb and power +UB is used to control the current. The time base circuit frequency is modulated by potentiometer RP (about 0.5 ~ 10Hz), and the nine-stage circulatory register is controlled by the square wave output signal via clock input end, so as to make every output ends turn to high level in turn. Because the pin11 reset input end is connected with pin 15, the first lamp gives out light when the 10th pulse comes.