Very good, guys, 220V or 110V grinders use just over 20K | Ngoc Quang Electronics 

Very good, guys, 220V or 110V grinders use just over 20K | Ngoc Quang Electronics
This is how to control the speed of a universal asynchronous motor, at a very low cost with just over 20k
Device application for the following devices:
Attention : 220V electrical appliances and 110V domestic appliances can still be used, pay attention to some renovations, see the following video
List :
Brush motor speed control
Grinder speed control
Iron cutting machine speed control
Super bottle speed control
Versatile asynchronous dynamic speed control
Universal asynchronous motor speed control
Incandescent light bulb control
Controls.....
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