This Gauss Meter Is Simple To Make

This DIY Gauss meter operates by utilizing a linear Hall effect sensor to detect changes in magnetic field strength and converting that magnetic flux density into a proportional analog voltage output. Powering the circuit begins with a standard 9V battery (6F22) managed by a toggle switch (S1) for power control. Because electronic sensors typically require a stable, reliable supply voltage to prevent measurement drift, an LM1117-5.0 voltage regulator (IC1) steps down the 9V battery output to a steady 5.0V DC rail. This regulated voltage powers the SS49E linear Hall effect sensor (IC2). When placed in a magnetic field, the SS49E outputs an analog voltage level that varies linearly with the magnetic flux it encounters, shifting up or down from its baseline quiescent output depending on field polarity and strength. To read these measurements, a digital voltmeter (DVM) or multimeter (DMM) is interfaced with the circuit using a 2-pin connector (CON1) and a 3-core cable. By probing the output of the sensor, the multimeter displays the corresponding voltage changes. Mechanically, the physical layout is stabilized using a circular piece of plexiglass or cardboard and secured with epoxy glue, creating a handheld or benchtop probe platform. Because no software or microcontrollers are involved, the entire system relies purely on analog DC voltage division, regulation, and direct sensor transduction.