Icstation NE555 Adjustable Duty Cycle Frequency Square Wave Pulse Generator Module Board Kits

This is a diy kit based on the the NE555 chip, it can train your soldering skills in the assembling process. Once finished it can become a multivibrator output the saure wave support duty cycle adjusting.It is perfect for electronics teaching and experiment.

Working Principle:
When power on, the VDD power supply will charge the capacitance C through R1 and R2. When Uc<1/3VDD，the module output Vo=1, the discharge tube close. When the capacitance C' voltage Uc≥2/3VDD, The oscillator output Vo=0, while the discharge tube will turn on,enable the discharge end(DIS) connect the GND, capacitance C dicharge the ground through R2, then the capacitance c's voltage will decrease, when Uc≤1/3VDD, the oscillator output Vo=1, the discharge tube will close again, enable the discharge end(DIS) do not connect to the GND, the VDD power supply will charge the capacitance C again, enable its voltage Uc increase from 1/3VDD to 2/3VDD, then the the oscillator output Vo=0, just repeat this processs, so enable the output port Vo get the continuously changing Oscillation pulse waveform. The pulse width TL≈0.7R2C is depended on the capacitance C discharging time. TH=0.7(R1+R2)C is depended on the capacitance C charging time, the pulse cycle T≈TH+TL.