Does Anyone know where to buy coils from?

Question

for a science fair project i need to know where i could buy the best pre-made coils in the US. preferably, with a gap in the middle, approximately the size of an arrow shaft. the wire needs to be very small as well. any help would be VERY appreciated!

for a science fair project i need to know where i could buy the best pre-made coils in the US. preferably, with a gap in the middle, approximately the size of an arrow shaft. the wire needs to be very small as well. any help would be VERY appreciated!

ps, last year i tried making my own, and it was a fiasco. i need these coils to act as small electromagnets and a metalic object will pass in the middle of the coil. i intent to eventually have dozens of coils.

Answer 1

http://www.mouser.com/search/Refine.aspx?Ne=254016+1447464&N=1323038%20254620&Ns=P_SField&RefType=Header

Answer 2

As has already been asked, just what is the coil for. What you describe isn't going to do much of anything other than possibly be useful for proof of concept. An arrow shaft is only about 1/2 inch or less in diameter. Even as an electromagnet on an iron core, it isn't going to do much. There are several things that enter into the discussion which you may be ignorant of. Inductance, such as for a radio project is important, and that size coil, without a good amplifier, just will not perform as desired. For a simple radio, a coil on a form that is at least 4 inches diameter would be more in line with what you need. As for the gap in the middle, to what end is the gap needed? The more details that you can give, the better help you can get.
For an electromagnet, while the small core is okay, if and only if that core is made of soft iron, or steel, many layers of coiled wire are needed to produce an electromagnet with any appreciable strength.

Answer 3

More often than not, coils are custom designed and manufactured for the application, though there are generic applications for which you can buy off-the-shelf products. They can come in a variety of sizes and shapes, including the single-layer solenoid which sounds like what you want. A variety of bobbins and coil forms are also available on which you can roll your own, and magnet wire is easy to find. I have designed and had manufactured coils manufactured for small-production commercial applications and have even wound a few prototypes myself.

What is this coil supposed to do in your project?

Answer 4

Wind your own! Years ago people made their own HBO receivers from scratch. You would wind the coils by wrapping wire around the shaft of a specific drill bit for a certain number of turns.

Answer 5

Try Digikey, or Mouser, they worked weel for me in the past.