Kit Name: NE555+CD4017 running lights kit/bulk
Supply Voltage: 2.5--14.5V
PCB Size: 5.4cm*2.1cm
PCB thickness: 1.6mm

Circuit Principle:
This kit is mainly composed of a clock circuit and decimal counter circuit, by the NE555 as the core of the self-excited polytunnel oscillator, power supply through R2, R3, R4 to the capacitor C1 charging, when the C1 just started charging, NE555 2 feet is still at a low level, so the output terminal 3 feet is a high level, when the power supply through the R2, R3, R4 to the C1 charging to the 2/3 power supply voltage, output 3 feet Level from high to low, NE555 internal discharge tube conduction, capacitance C1 by R4, R3, NE555 7 feet discharge, until the voltage on both sides of the C1 is lower than 1/3 supply voltage, NE555 3 feet of the level and from low to high level. C1 and charge again, so the cycle of the formation of the oscillation. Charging time is: 0.695 (R2 + R3 + R4) C1, discharge time is: 0.695 (R4 + R3) C1, adjust the R4 can control the output frequency of the oscillator, NE555 clock oscillation signal is constantly added to the 14 feet of the CD4017 in the CD4017 10 outputs are connected to the 10 LEDs, when the 10 outputs CD4017 in the clock signal. When the 10 outputs of CD4017 under the action of the clock signal take turns to produce a high level, then D1 - D10 is lit in turn, thus forming the effect of running lights.
Adjust R4 to adjust the flow rate of LED lights.

List of loose components:
Component Name: Quantity
PCB board: 1              
2P curved pin: 1  
1UF capacitor: 2
3mmLED Red: 10
1K resistor; 10
2.2K Resistor: 1
10K Resistor: 1
50K Lan White Potentiometer: 1
NE555: 1
CD4017: 1