Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.

Build a ELF monitor. This milligauss meter lets you check extremely-low-frequency electromagnetic emissions from electrical equipment.
COMPUTERCRAFT Oct 1991 (v.1#7) pg. 48

Magnetic field meter. Determine exposure to line-frequency magnetic-fields with this portable ELF (extremely-low frequency) gaussmeter. Sensitive from 0.1 microtesla to 20 milliteslas over a frequency range of 50 Hz to 20 kHz. Est. cost: $79 (kit).
ELECTRONICS EXPERIMENTERS HANDBOOK 1993 pg. 109

Magnetic field meter. Determine your exposure to line-frequency magnetic fields with this easy-to-build ELF (extremely-low frequency) gaussmeter. Est. cost: $79 (kit).
ELECTRONICS EXPERIMENTERS HANDBOOK 1996 pg. 95

Aurora monitor. Build a monitor to sense disturbances in the Earth's geomagnetic field caused by auroras and sun spots. Will also detect changes or anomalies in the magnetic field caused by large metal objects, permanent magnets, AC power lines, etc.
ELECTRONICS NOW Sep 1993 (v.64#9) pg. 66

Earth field magnetometry. A review of the earth's magnetic field properties and possible applications of a new fluxgate sensor.
ELECTRONICS NOW Sep 1996 (v.67#9) pg. 65
Added Info ELECTRONICS NOW Oct 1996 (v.67#10) pg. 61

Experimenting with magnetic sensors. Part 1. Flux-gate sensors.
ELECTRONICS NOW Jun 1998 (v.69#6) pg. 56

Experimenting with magnetic sensors. Part 2. Using a flux-gate sensor to build a practical magnetometer and gradiometer.
ELECTRONICS NOW Jul 1998 (v.69#7) pg. 49

Magnet tester. Build a magnetometer to test the field strength of magnets.
HANDS-ON ELECTRONICS May-Jun 1986 (v.3#3) pg. 62

Magnetic field sensors. Availability and application of electronic sensors that detect magnetic fields.
MODERN ELECTRONICS [2] Aug 1987 (v.4#8) pg. 59

Experimenting with Hall-effect devices, the principal solid-state sensors of magnetic fields.
MODERN ELECTRONICS [2] Sep 1987 (v.4#9) pg. 72

Build a hall-effect magnetometer to probe magnetic fields.
POPULAR ELECTRONICS [1] May 1974 (v.5#5) pg. 48

Magnetometers for investigating UFO's and other magnetic phenomena. A variety of home-built detectors to indicate magnetic disturbances such as those reported to accompany UFO sightings. Circuits included for a compass magnetometer, sky magnetometer, ground-loop sensing system and eddy-disk magnetometer.
POPULAR ELECTRONICS [1] May 1978 (v.13#5) pg. 41

Build an experimental AC hum sniffer. Two circuits which let you check out the extent of electric fields permeating the average household, mostly originating from the AC line.
POPULAR ELECTRONICS [2] Sep 1990 (v.7#9) pg. 59

Permanent-magnet detector circuit will produce a meter reading indicating the relative field strength of the magnet.
POPULAR ELECTRONICS [2] Jul 1991 (v.8#7) pg. 71

Electromagnetic fields and your health. Build a simple device to detect extremely low-frequency (ELF) magnetic fields. Est. cost: $25.
POPULAR ELECTRONICS [2] Mar 1993 (v.10#3) pg. 31
Added Info POPULAR ELECTRONICS [2] May 1993 (v.10#5) pg. 3

More electronic sensors. (1) Vibration detector. (2) Magnetic-field detector. (3) Tilt sensor. (4) Wind-direction sensor. (5) Reed-switch replacement.
POPULAR ELECTRONICS [2] Feb 1997 (v.14#2) pg. 73

Hall effect sensors and circuits. Part 1. (1) Simple magnet detector. (2) Magnet-pole identifier. (3) High-sensitivity detector.
POPULAR ELECTRONICS [2] Apr 1999 (v.16#4) pg. 59

Hall effect sensors and circuits. Part 2. (1) Simple detector. (2) Latching detector. (3) Pole identifier. (4) Modern reed switch. (5) Magnetic pulser. (6) Simple latching detector. (7) Magnetic lock-and-key circuit.
POPULAR ELECTRONICS [2] May 1999 (v.16#5) pg. 57

EMF Meter. Build and use a simple electric- and magnetic-field detector that allows you to measure the relative field strengths present around all operating electrical devices. Est. cost: $60 (kit).
POPULAR ELECTRONICS [2] Dec 1999 (v.16#12) pg. 29

Simplified schematic of a solid-state digital compass which uses a fluxgate magnetometer. The outputs are A/D converted and routed to a microprocessor that handles the bearing calculations and drives a suitable digital display. Included along with a discussion of methods for measuring the earth's magnetic field.
RADIO-ELECTRONICS Dec 1988 (v.59#12) pg. 33

Hall-effect devices. What is available and tips on their use.
RADIO-ELECTRONICS May 1990 (v.61#5) pg. 74

Magnetic field meter. Determine your exposure to line-frequency magnetic-fields with an easy-to-build portable ELF gaussmeter. Est. cost: $85 (kit).
RADIO-ELECTRONICS Apr 1991 (v.62#4) pg. 33
Added Info RADIO-ELECTRONICS Jul 1991 (v.62#7) pg. 8, 16
Added Info RADIO-ELECTRONICS Sep 1991 (v.62#9) pg. 17
Added Info RADIO-ELECTRONICS Oct 1991 (v.62#10) pg. 14

Sensitive magnetometer uses an audio signal to indicate magnetic fields with strength as low as 1/20,000 oersted. The stronger the field, the higher the number of beats per second which sound in the earphone. Small buried magnets can be located.
SCIENTIFIC AMERICAN Feb 1968 (v.218#2) pg. 124

Build a micromotion detector that can count insect heartbeats. Relies on the use of minuscule magnets and a sensitive Hall effect transducer. Est. cost: $40.
SCIENTIFIC AMERICAN Aug 1996 (v.275#2) pg. 96

Monitoring the earth's magnetism. Build a sensitive magnetometer to study those ephemeral undulations called magnetic micropulsations. The meter makes use of a torsion balance, one of the most sensitive instruments in science. Est. cost: $50.
SCIENTIFIC AMERICAN Jan 1999 (v.280#1) pg. 106

Build a simple suspended-magnet magnetometer to sense an aurora (northern lights). Est. cost: $3.
SKY & TELESCOPE Oct 1989 (v.78#4) pg. 426

Detect the polar lights (aurora) using this magnetometer circuit.
SKY & TELESCOPE Oct 1993 (v.86#4) pg. 85

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