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I use a coil (450 r-0.5 mm) a hall sensor inside the coil and a mosfet as a switch for the current to the coil. The diode protects the mosfet from the back emf of the coil. A resistance controls the current to the base of the mosfet. The coil attracts the magnet , then when the supply stops the magnet begin to fall , the supply to the coil begin again and attracts the magnet again .This happens many times per second and the magnet seems to stay in the same place.
YOU CAN WATCH THE VIDEO OF THE LEVITATION HERE :
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