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Magnetic Sensors Sensors & Detectors

Electromagnetic field detector
Electromagnetic Field Detector #1
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
Method offers Fail Safe Variable Reluctance Sensors:  11/27/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit
MilliGauss Meter
:  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 Demagnetizationsignal Polarity:  04/12/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circui

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