What is this big black bulge on wire cables?

[Passions]

I notice on alot of cables there is a bulge. Is it to reduce intereference? How does it exactly work?

Text

 

[XMan]

I think it's called a toroid coil, it's basically a magnet that the wires wrap around. Supposed to reduce EMI.

 

[rival]

i think it 'cleans' out the line before going into the component, absorbs line noise produced by 120v 60hz power

 

[JC]

What those guys said.......'cept isn't it called a choke?

 

[erikiksaz]

I could have sworn they were called Ferrite Cores.

 

[Colt45]

yeah, i believe its called a choke as well.

 

[ScottMac]

They are ferrite cores, sometmes called beads. They are a flavor of choke.

Chokes are inductance devices, the traditional flavor looks like a one-sided transformer.

They are there to suppress electromagnetic noise from the end it is closest to.

FWIW

Scott

 

[db]

It's a ben wa ball; there should be several to be effective.

 

[Sundog]

<< They are ferrite cores, sometmes called beads. >>


Yep...you will see them a lot on high end monitor coax extension cabling.

 

[Amused]

"Big Black Bulge?"

Isn't that a stereotype?

 

[Smacksmackums]

<< "Big Black Bulge?"

Isn't that a stereotype? >>


Lol

 

[Maetryx]

<< "Big Black Bulge?"

Isn't that a stereotype? >>



This is the racial double standard that I'm always raging about. What about Def Lepard? Didn't they have Big White Bulges?