The circuit for detecting the magnetic field using a linear UGN3501M sensor is shown in the figure. It consists of a zero-drift voltage compensation terminal and a constant voltage circuit on the chip, so the accuracy and stability are high. The output is in the differential form, and the input voltage is 1.3 to 1.4V for a 1KG magnetic field.
In the circuit shown, when detecting a DC or AC magnetic field, a DC voltmeter or an AC voltmeter can be connected to the output, or it can be connected to an oscilloscope. If the detection magnetic field is 2 to 3KG, the UGN3501M output is saturated.
The circuit example of detecting the rotation of the object by the switch type DN834 sensor is as shown in the figure. When the magnetic field is below 100G, the output of DN834 is high level, when the magnetic field is above 750G, the output is low level, and the magnetic field is between 100G and 750G. High and low transition points with hysteresis to stabilize operation. If the output of the DN834 is connected to a one-shot. During the rotation of the object, the DN834 outputs a square wave pulse as a trigger signal for the one-shot trigger. Keep Q at 1. When the object stops, Q=0 because there is no trigger signal.
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