A new magnetometer using a small ring core and MOS-FETs

A small magnetosensor with a very simple construction, a greatly reduced number of components, and a high sensitivity is presented. The circuit is based on the principle of the transistor core multivibrator, in which MOSFETs are used for switching. The sensitivity of the magnetometer is controlled by selecting the output resistance. The power consumption is very small because the commutation of the circuit is affected by the resonance between the saturation inductance of the core and the gate-source capacitance of the FET. The magnetometer is particularly suitable for obtaining biological information.<
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