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).

Here's the circuit:

 

 

Note that VDD and GND for the ICs are not shown in the circuit drawing.

 

Pin-outs:
(7)555		4017
1	GND	1	Q5	9	Q8
2	TRIGGER	2	Q1	10	Q4
3	OUTPUT	3	Q0	11	Q9
4	RESET	4	Q2	12	CO
5	CONTROL VOLTAGE	5	Q6	13	NOT ENABLE
6	THRESHOLD	6	Q7	14	CLK
7	DISCHARGE	7	Q3	15	RESET
8	VDD	8	GND	16	VDD

 

by Oscar den Uijl, odu@xs4all.nl