The circuit uses
a 555 timer oscillator to supply clock pulses of a variable frequency to the
4017 decade counter. The decade counter only needs to have three outputs so the
fourth output goes into the reset pin to start the cycle all over again. The
central red led is always on. Each row of four leds flash in sequence giving the
impression that the light is rotating. It is an idea that works very well giving
an eye-catching display. It will run continuously for three hours with a
standard pp3 battery
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