it name: NE555+CD4017 water lamp kit/parts
Power supply voltage: 2.5-14.5V
PCB size: 5.4cm*2.1cm
PCB thickness: 1.6mm
This kit is mainly composed of a clock generation circuit and a decimal counter circuit. It is a self-excited multivibrator with NE555 as the core. The power supply charges the capacitor C1 through R2, R3, and R4. When C1 is just turned on
When charging starts, the 2 pin of NE555 is still at low level, so the output pin 3 is high. When the power is charged to C1 through R2, R3, R4 to 2/3 of the power supply voltage, the level of output pin 3 is changed from High change
Low, NE555 internal discharge tube is turned on, capacitor C1 is discharged through R4, R3, NE555 pin 7 until the voltage at both ends of C1 is lower than 1/3 of the power supply voltage, NE555 pin 3 level changes from low level again
High level. C1 is charged again, and this 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 vibration
The output frequency of the oscillator, the NE555 clock oscillation signal is continuously added to the 14 feet of the CD4017, and 10 LEDs are connected to the 10 output terminals of the CD4017. When the 10 outputs of the CD4017
Under the action of the clock signal, the terminals generate high level in turn, then D1--D10 are lit in turn, thereby forming a water lamp effect.
Adjust R4 to adjust the flow speed of LED lights.
List of spare parts:
Component name Quantity
PCB board 1
2P curved pin header 1
1UF capacitor 2
3mmLED red 10
1K resistor 10
2.2K resistor 1
10K resistor 1
50K blue and white potentiometer 1
NE555 1
123456