This is a video of wiring 555 IC for PWM. The video shows how to wire the 555 chip for PWM. The pin 1 is connected to ground. pin number 2 is connected to pin number 6. Next, pin number 3 connected to the output. pin number 4 is connected to VCC. Pin number 6 is connected to 7 and the potentiometer. pin number 8 is connected to VCC. Here is the video: