How to build Knightrider lights for model cars

Description

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

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