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:
    http://www.allegromicro.com/en/Products/Categories/Sensors/linear.asp

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:

http://www.newark.com/allegro-microsystems/a1302elhlt-t/hall-effect-sensor-linear-3-sot/dp/31K6638?selectedCategoryId=&exaMfpn=true&categoryId=&searchRef=SearchLookAhead&searchView=table&iscrfnonsku=false

Older information is below:


    http://www.newark.com/allegro-microsystems/a1302eua-t/hall-effect-sensor-ic/dp/31K6639?_requestid=172713 
   
    They may also have "A1302KUA-T"available as their P/N 31K6641 found here:
    http://www.newark.com/allegro-microsystems/a1302kua-t/hall-effect-sensor-ic/dp/31K6641 
   
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.

 

Google

Some magnets, motors, aluminum tubes, plug-in power supplies, other odds and ends:
    American Science and Surplus
    Neon sign company, has high voltage neon transformers!  (maybe they still do?)
    http://allaboutcircuits.com for useful information on AC and DC circuits and power supplies
    http://www.handymagnet.com/ for the handy-magnet!

    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
    Ace Hardware
    True Value Hardware

Copper bars and plates:
    Central Steel & Wire Co.
 
Cool Toys:
    Arabesk (no longer active)
    The Nature Company
    The Museum of Science and Industry
    Shop for Science
    www.toymagnets.com
    www.mindfulgroup.com  
    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.

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