Knightrider lights for model cars
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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 V DD 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 | V DD | 8 | GND | 16 | V DD |
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