- A very basic 555 Timer Circuit that generates a PWM SquareWave signal with variable duty cycle useful for dimming LEDs or controlling the speed of a fan/motor The current PCB can control motors up to 500mA of current and with voltages from 6-12V
A few pictures with the PCB (an older version of the board the new one has thicker copper traces for more current):
And some videos that showcase the variable duty cycle with the help of a small PC fan :
555_PWM_Generator_1.mp4
555_PWM_Generator_2.mp4
It should be noted that at higher currents the MOSFET gets hot so a heatsink should be mounted
For more current increase the thickness of the copper traces