Circuit principle: After power on, NE555 and peripheral circuits form a multivibrator. The oscillation frequency is mainly determined by R1, RP and C2. Adjusting RP can change the oscillation frequency. The oscillation signal of the oscillator is output from pin 3 of NE555 and sent to CD4017. At the counting input terminal (pin 14), every time a pulse arrives, the high level of the Q0-9 output of the counter moves one bit in sequence, lighting up the corresponding light-emitting diode, thereby creating the feeling of running water. L11 is connected to the 4017 counting output terminal CO. When L1-5 lights up, the CO terminal of 4017 outputs a high level and lights up L11. When L6-10 lights up, the CO terminal outputs a low level and L11 does not light up. If you think L11 is unsightly, you don’t need to install it, and it won’t affect the circuit operation at all.
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