4017 LED Knight Rider Running Light Circuit Diagram
In this 4017 Knight Rider circuit diagram, the 555 uses as an oscillator. It can adjust to give the desired speed for the display. Because the output of the 555 is directly connect to the input of a Johnson Counter (CD 4017).
|D1 – D10||1N4148|
|D11 – D16||LED|
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 connect to the output without a current-limiting resistor (220Ω in the circuit above).
CD4017 pinout and description
The first 6 outputs of the chip connect 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.
Also 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.
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