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:

Schematic

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


Sorry, comments are closed!