Circuit introduction:
This kit is composed of NE555 multivibrator and CD4017 decimal counter/pulse distributor.When the first, third, and fifth pulses arrive, Q0, Q2, and Q4 output high level in turn, the blue LED flashes three times, and when the sixth, eighth, and tenth pulses arrive, Q5, Q7, and Q9 output high in turnLevel, the red LED flashes 3 times, and the blue LED flashes again when the 11th, 13th, and 15th pulses arrive, and the blue and red LEDs flash alternately in turn to form a simulated warning light.Changing the size of RP1 can change the oscillation period, thereby changing the speed of LED flashing, and the entire circuit can work with DC9-12V.