Normal 0 I made this Night Runner circuit for my car and scooter. At night it gives a very good effect and can also be used in the daytime. I have a switch to switch it on whenever I want to. In the Knight Runner circuit, the 555 is wired as an oscillator. It can be adjusted to give the desired speed for the display through a 500k variable resistor. The output of the 555 is directly connected to the input of an IC. CD 4017 Each output can deliver about 20mA but a LED should not be connected to the output without a current-limiting resistor 330R in the circuit above. Using six 5mm LED’s, the display can be placed in the front of a car to give a very artistic effect.