DIY Electromagnetic Levitation Device

This DIY electromagnetic levitation device operates on a continuous feedback loop to suspend a neodymium magnet in mid-air. At the core of the system is a custom electromagnet made by wrapping 26 or 27 gauge magnet wire around a structural core of cardboard or PVC piping. The electromagnet is powered through an analog circuit built on a dotted Vero board. As the neodymium magnet floats closer to or further from the electromagnet, its magnetic field changes. This change is detected by a Hall Effect Sensor A3144, which acts as a magnetic field detector. Because the sensor's output varies depending on the proximity of the floating magnet, it drives the gate of an IRFZ44N MOSFET transistor through a 1k resistor. The MOSFET acts as an electronic switch, rapidly modulating the current flowing through the magnet wire coil to dynamically adjust the strength of the electromagnet. A 330-ohm resistor limits current to the 5mm indicating LED, which shows when the power is active, while a 1N4007 flyback diode is placed across the electromagnet coil to protect the MOSFET from voltage spikes and back-EMF generated when the magnetic field collapses. Together, these analog components constantly measure the position of the floating object and adjust the magnetic pull in real time to keep it suspended.