Most of today's batch is hashtag-stuffed shorts and clickbait, but this one actually centers on a foundational power-electronics building block: using an N-channel MOSFET to control DC motor speed. The IRFZ44N is one of the most ubiquitous logic-level-friendly power MOSFETs in the hobbyist world — rated around 49A continuous and 55V, with a low R_DS(on) that makes it forgiving for learners experimenting without heatsinks at modest currents.

A speed controller built around it is a great vehicle for learning several concepts at once: how a MOSFET behaves as a switch versus in its linear region, why gate drive voltage matters, and how a simple potentiometer-and-555 (or analog) circuit translates to PWM duty cycle on the gate. Even if the host walks through it as a basic build, viewers can extract the underlying principles and adapt them to fans, pumps, or small robotics platforms.

The video is in Bangla, but circuit schematics and breadboard layouts are universally readable — auto-translated captions cover the rest. Worth watching if you want to internalize one of the most reusable patterns in low-voltage motor control.