Product parametersKit Name: ne555+cd4017 water lamp Kit / partsPower supply voltage: 2.5V ~ 14.5VPCV size: 54mm*21mmPCB thickness: 1.6mm

Product introductionThis kit is mainly composed of clock generation circuit and decimal counter circuit. The self-excited multivibrator with NE555 as the core charges capacitor C1 through R2, R3 and R4. When C1 just starts charging,Pin 2 of NE555 is still at low level, so pin 3 of output terminal is at high level. When the power supply is charged to C1 to 2/3 power supply voltage through R2, R3, R4, the level of pin 3 of output terminal changes from high to low, and the internal discharge tube of NE555 is connected,Capacitor C1 is discharged through pin 7 of R4, R3 and NE555 until the voltage at both ends of C1 is lower than 1/3 of the power supply voltage, and the level of pin 3 of NE555 changes from low level to high level. C1 is recharged again, so the cycle forms an oscillation.The charging time is 0.695 (r2+r3+r4) C1, and the discharging time is 0.695 (r4+r3) C1. Adjusting R4 can control the output frequency of the oscillator. The clock oscillation signal of NE555 is constantly added to the 14 pin of CD4017,Ten LEDs are connected to the ten output terminals of the CD4017. When the ten output terminals of the CD4017 generate high levels in turn under the action of the clock signal, d1-d10 are lit in turn, thus forming a flowing light effect.Adjust R4 to adjust the flow speed of LED light.

Kit listComponent name: quantityPCB board: 12p curved needle: 11uF capacitance: 23mmled Red: 101K resistance: 102.2k resistance: 110K resistance: 150K blue white potentiometer: 1NE555：1CD4017：1