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What are those metal donuts that wires wrap through / around for?

I have no idea what these things are called so I don't know what
terms to search on to research them.

Anyway, it looks like a metal donut that a paired set of wires wrap
around and through multiple times.

Questions:

1. What is it called?
2. What purpose does it serve?

Thanks

-Marcus
 
B

BobG

Jan 1, 1970
0
1. What is it called?
2. What purpose does it serve?
============================
1) ferrite bead
2) Its an inductor. Blocks hi frequencies, passes lo frequencies
 
M

ME

Jan 1, 1970
0
Also could be a transformer.

Depending on how they are wired.

Step up
Step down
or isolation transformer.
 
R

Roger Johansson

Jan 1, 1970
0
1) ferrite bead
2) Its an inductor. Blocks hi frequencies, passes lo frequencies

It can also be called a _core_ for a toroid inductor, or a core for
a transformer, if more than one winding is used.

An information page for beginners about beads, toroid cores,
transformer cores, scroll down to see pictures:
http://sound.westhost.com/xfmr2.htm

This is one of the most known makers of toroid cores
http://www.amidoncorp.com/product.htm
 
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