Product Specifications:

Voltage: 2.5-14.5V
PCB Size: 54mm*21mm
Thickness: 1.6mm
Weight per set: 6.7g
This product is an assembly kit and requires soldering by yourself.
Components and quantities included in each DIY kit:

PCB board *1
2P curved pin header *1
1UF capacitor *2
3mm red LED *10
1K resistor *10
2.2K resistor *1
10K resistor *1
50K blue and white potentiometer *1
NE555 *1
CD4017 *1

Structure: This kit mainly consists of a clock generation circuit and a decade counter circuit, and a self-excited multivibrator with NE555 as the core, which charges the capacitor C1 through R2, R3, and R4.

When C1 has just started to charge, the 2 pin of NE555 is still at low level, so the output pin 3 is high. When the power supply charges C1 through R2, R3, and R4, it will be 2/3 of the power supply voltage. The output pin 3 level changes from high to low, the internal discharge tube of the NE555 is turned on, and the capacitor C1 is discharged through R4, R3, and pin 7 of the NE555 until the voltage across C1 is lower than 1/3 of the supply voltage, the level of pin 3 of the NE555 changes from low to high again. C1 is charged again, and this cycle oscillates.

Charge and discharge time: The charge time is 0.695 (R2 + R3 + R4) C1, and the discharge time is 0.695 (R4 + R3) C1. By adjusting R4, you can control the output frequency of the oscillator. The clock oscillation signal of the NE555 is connected to pin 14 of the CD4017.

Output: The 10 output terminals of the CD4017 are connected to 10 LEDs. When the 10 output terminals of the CD4017 generate high levels in sequence under the action of the clock signal, D1 to D10 are lit in sequence to form a water lamp effect.

Adjustable: This flow lamp can adjust the flow rate of the LED lamp by adjusting R4.

Package contain:
3 Sets of NE555 + CD4017 Flowing Water Lamp LED Light Module DIY Kit