[sdiy] Powerline LC filters etc.

[Neil Johnson]

Ian Fritz wrote:
> At 09:38 AM 2/29/2012, Harry Bissell wrote:
>
>> Watch out for the trouble I pointed out earlier... separate ground
>> impedances mean different DC voltage drops, you may create ground
>> loops by
>> connecting various modules together.
>
> I wasn't clear on this from the data sheet. Are these actually
> wire-wound inductors or they ferrites. Ferrites shouldn't have issues at
> dc, na?

It really depends on the type of the filter.  For example, DC 
common-mode chokes used for suppression of RF in DC power inlets are 
quite often wound components, e.g.:

http://www.farnell.com/datasheets/731565.pdf

Cheers,
Neil
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