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NE555+CD4017 Light Water Flowing Light LED Module DIY Kit - Dark Blue
Board size. 53mm*19mm Supply Voltage: 2.5~14 .5V This package is mainly decimal counter circuit and circuit generated by the clock£¬ from the core of the self-excited NE555 multivibrator power through R2£¬ R3£¬ R4 charge the capacitor C1£¬ C1 started when charging£¬ NE555 2 feet still in low£¬ so the output pin 3 goes high when power through R2£¬ R3£¬ R4 to charge C1 to 2/3 of the supply voltage£¬ the output pin 3 level from high to low£¬ NE555 conducting internal discharge£¬ capacitor C1 through R4£¬ R3£¬ NE555 7 feet discharge until the voltage across C1 is less than 1 /3 of the supply voltage£¬ NE555 and 3 feet level from low to high. C1 and charge again this cycle oscillations formed. Charging time: 0.695 (R2 + R3 + R4) C1£¬ discharge time: 0.695 (R4 + R3) C1£¬ R4 can be adjusted to control the output frequency of the oscillator£¬ the oscillation clock signal is applied continuously NE555 CD4017 14 feet£¬ the output terminal 10 is connected with the CD4017 10 LED£¬ when the output terminal 10 turns CD4017 generated clock signal is applied at a high level£¬ the D1 - D10 are sequentially lit to form a water -light effect. You can adjust the flow rate adjustment R4 LED lights.