Russ,

Than ks for your reply.  Would this also apply to the 'cylinders' on the 
DC power feed to the laptop?

Preston

Russ Poffenberger said the following on 22/05/2007 11:57 AM:
> Preston,
> 
> This sounds like a ferrite core or bead. These are used to suppress RF 
> (Radio Frequency) signal interference that might be present on the 
> wires. Without these beads, the signals would travel down the length of 
> the wire and possibly emit radio interference along the path of the wire.
> 
> These ferrite beads are usually made of powdered iron that has been 
> pressed together into the desired shape.
> 

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