EFT suppress on notebook DC power cable?

[Roger Liu]

Hi, All

I noticed that on my notebook DC power cable there is a cylinder between the
DC converter and the output plug on my notebook. And on many consumer
electronics products such as Digital camera, that cylinder object also
exists. I guess that there is a EFT choke coil inside it. Is that right? If
so, is there any information on that? For example, Standard, Spec, Product
Ads...

I am interested on that because recently I am doing a project for suppress
EFT on nano order. Neither diode or TVS could suppress that kind of EFT.


Thanks and Regards

Roger