Where to obtain the supplies and equipment
Catalog houses and stores
Please note: the information at the end of several articles refers to the part number of that item at the source indicated. Arbor is Arbor Scientific, ScientificsOnline is ScientificsOnline , AS&S is American Science and Surplus, EdIn is Educational Innovations.
Wondered where to purchase the magnets, motors, and other things you need to make the demonstrations discussed on these web pages? Try these places:
NIB magnets, experimental kits, etc:
first4magnets.com for a huge variety of NIB, ceramic, alnico, wind generator, high-temp magnets, assemblies, ferrofluid, gauss meter, and more - located in the UK
Arbor Scientific Arbor has very handy instruction sheets and ideas which they ship with their kits
K&J Magnetics for a large variety of NIB magnets
Teachersource Educational Innovations, have magnets, games, toys, big selection
Steve Spangler Science great experiments, videos, supplies for the classroom and home
Apex Magnets with several items to choose from
Magcraft for MAGCRAFT® NIB magnets, ferrofluid, pyrolytic graphite disks, gaussmeters, viewing film, etc.
ScientificsOnline lots of science supplies, magnets, science fair items, stuff
BuyMagnets.com for a large variety of NIB, ceramic, alnico magnets, assemblies, industrial separators, electromagnets
SargentWelch lots of science supplies
ScienceKit lots of science supplies
Ward's Natural Science lots of science supplies
Dowling Magnets for a train maglev kit and strip magnets
AUSSIE magnets (the Magnet Shop) for those in Australia who need a great source for magnets!
Lodestone Industries also in Australia, with good support information
Shaw Magnets in the UK
The Magnet Source
Amazing Magnets for NIB magnets, steel balls, magnetic sculptures, ferrofluid, great site!
Applied Magnets for NIB magnets, SmCo magnets, spools of magnet wire, parts for wind generators, etc
SuperMagnete in Europe, for NIB magnets, sculptures, other items - lots of stuff!
Radio Shack for electronic parts, kits, a few magnets
Digi-Key for electronic components, Hall-effect sensors, etc.
CZFerro for ferrofluid and kits
Marlin P. Jones & Assoc.
www.amazing1.com/voltage.htm for some great high voltage kits
www.magnets.com for refrigerator magnets
OfficePlayground for executive toys and wooden toys and magnetic toys
Grand Illusions for magnetic and other types of toys
VAT19 Shop of Curiously Awesome Gifts
eNASCO catalog for educational supplies
Hall Effect Devices:
Radio Shack no longer carries these devices. However, they are made by Allegro and are available from two other sources.
General information about the Allegro Hall Effect Devices can be found here:
They make several types of devices, but these fall into the
category of "Linear Hall-Effect Sensors".
An excellent Application Note can be found at http://www.datasheetarchive.com/AN27702-datasheet.html
It will give you a good understanding of how they work, how they are used, and some of their limitations.
I would recommend their P/N A1302 which has a sensitivity of
1.3mV/G. With this, you will be able to measure fields about as strong as
1690 Gauss which is good for permanent magnets.
The datasheet for this device is found at http://www.allegromicro.com/en/Products/Part_Numbers/1301/1301.pdf
Some other information you should consider.
1. The package that is easiest to work with is called the SIP (Single In-line Package). It looks like this:
This allows you to easily plug it into a socket or into a breadboard. This package has the suffix "UA" in the full part number string.
2. The other package, with the suffix "LH", is
for surface mounting, called SMD (Surface Mount Device), and is very
small. Do NOT buy this. It looks like this:
This package is a little less than 0.30" in length, and the leads don't extend very far. Not useful for breadboards.
3. These devices also come with two temperature ranges
over which they are designed to operate.
The temp range of -40C to +85C is called the industrial range, and uses the suffix "E" in its part number string. This is less expensive.
The temp range of -40C to +125C is called the automotive range, and uses the suffix "K" in its part number string. This is more expensive and may have a longer lead-time (time between when you order it and when they can ship it - could be 60 days, 120 days, etc).
All you need is the industrial temperature range.
4. This means that what you want is their part number "A1302EUA-T". The "-T" at the end of the part number means no lead (Pb) was used in the manufacturing of that part. An alternate part number is "A1302KUA-T" which will be a little more expensive but would also work well.
5. Newark usually has thousands of "A1302EUA-T" available as their P/N 31K6639 and can be found here:
Older information is below:
They may also have "A1302KUA-T"available as their P/N 31K6641 found here:
How do you order it? One way is to give them a call at 1.800.4.NEWARK (1.800.463.9275).
Another way is to register with them on-line at https://www.newark.com/jsp/profile/register.jsp?fromPage=true and order on-line.
6. Another supplier is Digi-Key at http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=620-1022-ND
Cost is a little higher because of the temperature range. They don't seem to carry the A1302EUA-T.
Contact them at:
7. As a last resort, I would contact Allegro directly,
or one of their representatives, and try to obtain 2 of them as samples, or buy
them. Don't buy just one. Get two or three. They only cost
about $1 each, and if you overheat one, or plug it in backwards, or your dog
eats it - you'll have a spare.
Tell them what kind of project you are working on, and that you'd like 2 or 3 to try as samples, or to buy.
8. If you need to measure weaker fields, there are other
sensitivities that are available.
A1302 has a sensitivity of 1.3mV/G. You will be able to measure a magnetic field about as strong as 1690 Gauss with that.
A1301 and A1323 have a sensitivity of 2.5mV/G. You will be able to measure a magnetic field about as strong as 880 Gauss with them.
A1321 has a sensitivity of 5.0mV/G. You will be able to measure a magnetic field about as strong as 440 Gauss with that.
Earth's magnetic field is only 0.5 Gauss, and is not easy to measure and is influenced by a lot of things.
So, you can pick the one you are most interested in. I found that the A1302 works very well for most permanent magnet experiments.
Some magnets, motors, aluminum tubes, plug-in power supplies, otherodds and ends:
There is paint available that can be used to paint a plaster wallboard, or other surface to which magnets normally don't stick. Contained in the paint are small iron particles that allow magnets to stick to whatever surface is coated with this paint. I know of two companies that make this: Krylon (I found this at Ace Hardware), and http://magnamagic.com/products/magnetic-receptive-chalkboard-paint.
Hardware, screws, tee-nuts, stainless steel screws and bolts,
shelving boards, metal plates (aluminum, brass, copper):
Menards Hardware or Handy Andy or Home Depot
True Value Hardware
Copper bars and plates:
Central Steel & Wire Co.
Arabesk (no longer active)
The Nature Company
The Museum of Science and Industry
Shop for Science
www.supermagnete.de/?adwords3 interesting sculptures
Software for simulating magnetic and electromagnetic fields:
Ansoft Corporation no longer has their FREE Student Version of their 2D Maxwell program available on-line.
Here is a basic user manual I wrote to help you step through the software if you have it.
Simplorer software for simulating electrical circuits, FREE Student Version available!!
Formulas used for solving magnetic problems
Infolytica software - great examples!
For books and videos about magnets and magnetism, go to BOOKS.