Want parts to build your own gaussmeter? Here is an AC magnetic field probe. It generates an AC voltage when exposed to AC magnetic fields. Although we do not know how the output from this unit varies with frequency, we do know that the greater the magnetic field, the higher the voltage generated (at 60 Hz, it produces about 1 mV per 20 mG). It can be connected to a DMM, analog voltmeter, oscilloscope, audio amplifier (see below), or recording device. Connect 3 of them in series and create a 3-axis unit. It is quite small: only 0.7" long x 0.7" diameter, with a removable rubber suction cup attached. Has 36" lead and 1/8" (3.5 mm) mono plug.
Magnetic Pickup (Cat. #A175) …........…. $4.95
Unit includes a single axis probe on 2 foot cable and audio amplifier with adjustable volume. You can even use an optional earphone/headset for discreet operation. Use it to “sniff out” sources of interference, offending EMF, check shielding designs. Makes a great educational tool. Requires one 9V battery.
Budget Buzz Stick (Cat. #A175-B) ...............… $16.94
COMPASS
Compass (Cat. #A124) …............. $2.50
MAGNAPROBE
The MagnaProbe can be used to show :
This is a very important tool for mapping the direction of field lines prior to shielding design (speaker shielding for example), and is a great teaching tool.
MagnaProbe (Cat. #A420) …………..… $14.95
Build Your Own Multi-Purpose Meter Three separate field sensors to provide a really cool readout on two Sci-Fi styled LED bar graphs! Utilizing the latest technology, including Hall Effect sensors, you can walk around your house and actually "SEE" these fields around you! Can detect the magnetic field of the earth...THAT'S sensitive! Also detect radiation from monitors, TV's, electrical discharge, and RF emissions. You will have fun finding these fields and at the same time learn the technology behind them. Three position selector switch that lets you select which type of field you want to detect: either RF, DC magnetic, or electric. Display consists of two LED bargraphs, one at the top and one at the bottom. These indicate the relative strength of the field you are detecting. All in all, it’s a great way to learn about the use of electronic components as sensors and own a little piece of sci-fi at the same time. A great teaching tool for kids of all ages; show them the invisible fields all around them and learn about electronic circuitry and soldering.
Requires adult supervised assembly, soldering, and some knowledge about electronic components.
Tri-Field Meter Kit (Cat. #A113) …………………………………. $64.95
For extended meter use, allows you to use plug-in power to replace the 9V battery in any meter which uses one. Saves money on batteries.
AC to 9V DC adapter (Cat. #A421) … $9.95
ORDERS: 8 8 8 - L E S S - E M F
What better way to learn than by doing? This unusual book enables readers to carry out more than 55 different experiments, carefully planned to illustrate important principles of modern science. Clear step-by-step instructions, frequent diagrams, and helpful conclusions all enable students of electricity and magnetism to carry through these fascinating projects with minimal supervision, yet full success. Grades 5-12. 88 paperbound pages. 1960.
Electricity Experiments for Children (Cat. #A591) ....... $4.95
ORDERS: 8 8 8 - L E S S - E M F
Here are 101 entertaining experiments for fast and reliable learning of the basic principles of electricity. Categorized into static electricity (38 experiments), magnetism (32), and current electricity and electromagnetism (31) for maximum exposure to the fundamentals. Each experiment beginning with a list of safe and inexpensive materials needed and some introductory remarks, is presented with detailed step-by-step instructions and clear illustrations. The reader learns where to get/make electricity, how to store it, and how to use it in a number of creative ways. Although carefully selected to be safe for children, this book is suitable for young and old students of electromagnetism. 117 paperbound pages. 1964
Safe & Simple Electrical Experiments (Cat. #A593) ..................... $7.95
ORDERS: 8 8 8 - L E S S - E M F
"Spectacular Science Projects:"
Electricity (Cat. #A626) ..................... $10.95
Magnets (Cat. #A627) ..................... $10.95
Copyright 1996-2006, Less EMF Inc.
|
Common ELF magnetic field frequencies are within the range of human hearing. This simple set up converts the AC magnetic signal directly into a dramatic corresponding sound signal. A 60 Hz powerline field sounds like a 60 Hz hum (a low note on piano keyboard). Harmonics can easily be heard, as well as clicks, static, and hash. LED displays are especially noisy. The strength of the field is proportional to loudness.
Looking for the cheapest way to determine if something is magnetized? Want a simple device for comparing magnets? Doing a school project? Lost? For hundreds of years, mankind has used the trusty compass to guide him through the Earth’s magnetic field. Measure the deflection of the needle from magnetic North at known distances using this nice 1-3/8 inch diameter compass to quantify and compare DC magnetic fields, track down magnetized components, or evaluate magnetic shielding performance. Much cleaner than iron filings. Makes a great science fair project too. Includes a loop for your keychain, charm bracelet, or necklace. Compass must be held horizontally to operate.
The perfect way to visualize the three dimensional nature of a DC magnetic field. MagnaProbe is a small magnet suspended in a gimbal mounting. The magnet's North pole is colored red, South is blue, to easily indicate polarity of the field under investigation.
by Gabriel Reuben
by Rudolf F. Graf
Includes 20 simple and fun experiments that allow you to learn about electric charges with a simple experiment using modeling clay and a plastic straw; about voltage using a bowl, paper towels, and a raw egg; about conductors with some clothespins, aluminum foil, and a flashlight bulb; plus dozens of additional suggestions for developing your own science fair projects.
All experiments are safe, use inexpensive household materials, and involve a minimum of preparation and clean up. Clearly written. 1994.
