This simple circuit drives 6 LEDs in 'Knightrider scanner mode'. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS version).
Circuit diagram
Note that VDD and GND for the ICs are not shown in the circuit drawing.
Pin-outs:- (7)555
- 1 GND
- 2 TRIGGER
- 3 OUTPUT
- 4 RESET
- 5 CONTROL VOLTAGE
- 6 THRESHOLD
- 7 DISCHARGE
- 8 VDD
- 4017
- 1 Q5
- 2 Q1
- 3 Q0
- 4 Q2
- 5 Q6
- 6 Q7
- 7 Q3
- 8 GND
- 9 Q8
- 10 Q4
- 11 Q9
- 12 CO
- 13 NOT ENABLE
- 14 CLK
- 15 RESET
- 16 VDD