Knight Rider Running Light Schematic

Posted on Feb 4, 2014

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 CD 4017. The input of the counter is called the CLOCK line (555). 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

Knight Rider Running Light Schematic
Click here to download the full size of the above Circuit.

to the output without a current-limiting resistor (220 © in the circuit above). 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 6 LEDs, the display can be placed in the front of a model car to give a very realistic effect.

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