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Magnetic Detectors & Sensors Circuits

Electromagnetic Field Detector #2: This circuit is sensitive to low frequency electromagnetic radiation and will detect for example hidden wiring or the field that encompasses a transformer. Pickup is by a radial type inductor, used as a probe which responds well to low frequency changing magnetic and electric fields. Ordinary headphones are used to for detection. The field that surrounds a transformer is heard as a50 or 60Hz buzz.  

Geomagnetic field detector:

Magnetic Gun: When optimally tuned, it will propel a small slug about 1.5 metres high, or 2.5 metres horizontally

Magnetometer: 

Method offers Fail Safe Variable Reluctance Sensors: 11/27/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

MilliGauss Meter

RC Network Eliminates Precision Reference: 08/04/94 EDN-Design Ideas

Simple Circuit Creates Magnetic-Card Lock: 11/08/99 Electronic Design - Ideas for Design / This is a simple but interesting circuit to make a magnetic card lock. Using this lock system, shown in the figure, you can open a door, switch on a. . .

Two Diodes Change Demagnetization signal Polarity: 04/12/01 EDN-Design Ideas / PDF contains multiple circuits.


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