Item Tag: NE555 CD4017

Circuit: mainly composed of pulse generator and a decimalism counter circuit.Pulse generator is made up of NE555 and peripheral components.When press S1,Q1 will be connected,NE555 3 pins output pulse,and then CD4017 5pcs output ports will output high level in turn.By resistor and triode different combinations,it can drive 7pcs LEDs and let them on so as to display 1-6 number.