Exploring Speed Control on a Cheap Fan

I bought this fan (actually a few of them) because it has a knob with a clicky switch to make seemingly infinite adjustments to the speed. But how does it work in a fan this cheap? It's actually pretty cool! Also, I dive into investigating some of the protections the little integrated motor controller has to prevent damaging the controller or the motor windings. Check it out!
⚠️ Disclaimer:
This video is for educational purposes only. Any and all work to repair or test a device is performed at your own risk. The Curious Engineer (TCE) is not responsible for any possible harm, damages or injuries caused by the use or misuse of the provided information. Taking action from this video, is accepting that you proceed solely at your own risk.