As shown in the figure, an accelerating spot forming circuit consisting of a 555 time base circuit and a decimal counter divider CD4017, which can form a spot of light from left to right, is commonly used in various decorations. .
Accelerated spot forming circuit
As can be seen from the circuit diagram, NE555 and R1, R2, RP and C1 constitute a self-excited oscillator. The output terminals Q0~Q3 of CD4017 are connected to LEDs1, Q4~Q6 are connected to LED2, Q7~Q8 are connected to LED3, and Q9 is connected to LED4.
When the switch S is closed, the self-excited oscillator sends a square wave pulse to the CP terminal of the CD4017, and its output terminals Q0 to Q9 sequentially output a high level. Therefore, LED1 lasts for 4 pulse periods, LED2 is illuminated for 3 pulse periods, LED3 is illuminated for 2 pulse periods, and LED4 is illuminated for 1 pulse period. This will visually create a spot of accelerated motion.
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