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 3 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
TEXTILE PUSH BUTTON KITDead-man Style Fabric Switch
Instructions:
Textile Push Button Kit (Cat. #A301) ....... $16.00
PRESSURE SENSITIVE FABRIC SWITCHTape format, 4 cm x 100 cm
Instructions:
Pressure Sensitive Fabric Switch (Cat. #A302) ....... $25.00
SOFT FABRIC POTENTIOMETER KITFlexible, Variable Resistance
Compatible with Arduino inputs. Very easy to connect. Kit includes 1 meter of knitted conductive tape, instructions for a simple circuit using a Lilypad Arduino (not included), and a metal ring.
Instructions:
Soft Potentiometer Kit (Cat. #A303) .......... $7.00
BOBBIN THREADConductive Silver Plated Nylon
With this conductive thread, you can add conductivity to any fabric, make conductive traces as easily as sewing, even use it as un-insulated low voltage wiring. Great for embroidery too. You get 2 bobbins: one large and one small, to fit most sewing machines. Can also be hand sewn. Approximately 20 meters of thread per bobbin. Hand wash, no bleach. Hang dry. Do not dry clean. Needle and thimble not included.
Bobbin Thread (Cat. #A304) .......... $13.00
1.75 INCH COMPASS
1.75 inchCompass (Cat. #A123) …............. $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) …………………………………. $74.95
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
"Spectacular Science Projects:"
Electricity (Cat. #A626) ..................... $10.95
MAGNETS
Magnets (Cat. #A627) ..................... $10.95
 lessemf@lessemf.com
Copyright 1996-2010, 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.
Here is a very unique switch. Knitted from polyester and stainless steel fibers, an electrical contact is made when the 4x4 cm patch is compressed. Use it for robotic applications, occupancy sensors (in a seat for example), or intrusion alarms (when stepped on). Also great for artistic purposes: put it in a shoe, or attach it to a garment (glove tip or elbow patch for example) to control lights or sounds when you move. Kit includes 2x3 inch fabric switch, LED bulb, conductive thread, instructions, one CR 2032 3V coin battery with battery holder. Just add your own sewing needle, to make the simple educational project shown.
Knitted pressure sensitive fabric made of three layers. Two layers of stainless steel are separated by one layer of acrylic fabric. When pressed, the two external layers touch, allowing current flow. This basic sensitive fabric has a functioning equivalent to a push button switch. When you press it you close an electrical circuit. This fabric is compatible with the Arduino platform, and it can be connected to an Arduino controller without any additional hardware.
As simple as playing with your zipper. This soft 39 inch fabric potentiometer is perfect for controlling the brightness of an LED or the changing the tone of a buzzer to make cool sound effects. Can also be used as a position sensor. Resistance of this component is changed by sliding the position of the ring.
Need to sew with conductive thread? Want to add a conductive stitch to a non-conductive fabric? Only need a little bit?
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 1.75 inch diameter compass to quantify and compare DC magnetic fields, track down magnetized components, or evaluate magnetic shielding performance. Extra large, easy to hold, and very easy to see. High resolution with large needle. Aluminum case with loop for key ring or lanyard. Check DC magnetic fields, identify magnetized steel, or just find your way home!
Much cleaner than iron filings. Makes a great science fair project too. Compass must be held horizontally to operate. May look different from picture.
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 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.
