fig:- Running light circuit diagram We use two ICs one is 555 timer IC for frequency generator and another is CD4017 which is a decade counter.and the arrangement of circuit is made as shown in above figure. Here the 555 timer IC is operated in astable mode,that means it doesn't have stable state.the output continuously switches state between high and low without any intervention from the user, called a "square wave".it can use as a clock pulse for a digital ICs and circuit. fig square wave output from pin 3 of 555 IC. The output of timer IC is then connect to the 4017 IC. The 4017 is a deca...
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