Studying the Effect of Magnetic Filed on the Electrical Properties of Germanium Diode

The germanium P-N junction diode is used as a gauss meter probe. Depending on the magneto resistance of the diode a differential amplifier circuit has been designed and built for this purpose. The differential amplifier can detect and measure changes in electrical properties of the diode. Due to the fact that these changes are not linear to magnetic field, the circuit is further modified to produce out put reading that have linear relationships to magnetic field values.