Stoppi has once again impressed with a simple yet fascinating project – a magnetic levitator showcased in the video below. The design employs classic components including a 5 V regulator IC, a Hall effect sensor, a 741 op amp, and a MOSFET to control the electromagnet. Alongside these are a few passive components and a diode, keeping the setup uncomplicated.
The Hall effect sensor provides a voltage output that varies around a 2.5 V center depending on the polarity and strength of the magnetic field. Acting as a comparator, the op amp, with a potentiometer setting the trip point, detects changes in voltage as the magnetic field interacts with the levitating object. When the ball approaches the coil, triggering the comparator, the FET is turned off, halting the electromagnet’s current and allowing the ball to fall.
As the ball descends, the sensor’s voltage decreases, eventually activating the electromagnet once again. This cyclic process stabilizes the ball in a relatively steady position, demonstrating the simplicity and effectiveness of magnetic levitation achieved through basic electronic components.
Read more: Simple Magnetic Levitator