Description: - DIY Kit NE555+CD4017 10 CH LED Light Water Electronic Suite Circuit Board
- Practical Welding practice water lamp
- This package is mainly composed of the clock generation circuit and the decimal counter circuit.
- The NE555 is the self-excited multivibrator with the NE555.
- The power supply is charged to the capacitor C1 through R2, R3 and R4.
- When the C1 is started to charge, the NE pin of the NE555 is still Low level, so the output 3 feet are high, when the power by R2, R3, R4 C1 to charge to 2/3 power supply voltage, the output 3 feet level from high to low, NE555 internal discharge tube conduction , Capacitor C1 by R4, R3, NE555 7 feet discharge, until the voltage at both ends of C1 less than 1/3 of the power supply voltage, NE555 3 feet level from low to high level.
- C1 again charge, So the cycle of the formation of oscillation. (RS + R3 + R4) C1, the discharge time is: 0.695 (R4 + R3) C1, adjust R4 can control the output frequency of the oscillator, NE555 clock oscillation signal is continuously added to the CD4017 14 feet, 10 of the 10 outputs of the CD4017 are connected to 10 LEDs.
- When the 10 outputs of the CD4017 are rotated high by the clock signal, the D1 - D10 is illuminated in order to form the running lamp effect.
- Adjust R4 to adjust the rate of LED lights.
Package Includes:1 piece Circuit Board