4017 LED Knight Rider Circuit Diagram

led knight rider circuit using 4017 and 555 ic's

4017 LED Knight Rider Running Light Circuit Diagram

In this  4017 Knight Rider circuit, the 555 is wired as an oscillator. It can be adjusted to give the desired speed for the display. The output of the 555 is directly connected to the input of a Johnson Counter (CD 4017).

led knight rider circuit diagram using 4017 and 555 ic's

R1 22kΩ
R2 220Ω
C1 1µF 16V
C2 0.01µF (103)
C3 10µF 16V
D1 – D10 1N4148
D11 – D16 LED
IC1 NE555
IC2 CD4017

The input of the counter is called the CLOCK line. The 10 outputs become active, one at a time, on the rising edge of the waveform from the 555. Each output can deliver about 20mA but a LED should not be connected to the output without a current-limiting resistor (220Ω in the circuit above).

CD4017 Counter Divider pin Configuration 4017


The first 6 outputs of the chip are connected directly to the 6 LEDs and these “move” across the display. The next 4 outputs move the effect in the opposite direction and the cycle repeats. The animation above shows how the effect appears on the display.

Using six LEDs, the display can be placed in the front of a model car to give a very realistic effect.

The outputs can be taken to driver transistors to produce a larger version of the display.

led knight rider circuit diagram 4017 led knight rider circuit

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