Knightrider lights for model cars
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