Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › Doodlebug - USB Isolator
New Posts  All Forums:Forum Nav:

Doodlebug - USB Isolator - Page 19

post #271 of 272
Quote:
Originally Posted by tomb View Post

 

Is the ferrite core important in this application since the DoodleBug performs complete isolation?

FWIW, the ferrite is to protect components connected to the cable, since the cable acts as an antenna and pics up RF.

Quote:
Originally Posted by tomb View Post
 

If that's 12V DC, then yes.  If 12V AC, then it may be too much.

Thanks for the info.

post #272 of 272
Thread Starter 
Quote:
Originally Posted by shake View Post
 
Quote:
Originally Posted by tomb View Post

 

Is the ferrite core important in this application since the DoodleBug performs complete isolation?

FWIW, the ferrite is to protect components connected to the cable, since the cable acts as an antenna and pics up RF.

 

Yes.  Hence my rhetorical question: is a ferrite really important in this application?  To be more specific, the DoodleBug breaks the connection in the cable, so anything - including RF - is rejected at that point.  If a small enough cable is then used to connect the DoodleBug to the DAC, then what's the point?  Further, the USB cables we recommend all have shields.  Those should ground any extraneous interference signal.

 

Even then, the USB stream in the cable is digital, not analog.  Unless the RF is so overpowering as to interfere with the digital signal, I'm still wondering whether a ferrite will have any effect in this scenario.

 

The only other cables involved in the audio stream would be the RCA cables or headphone cable - not sure I've ever seen a ferrite on those, either.

 

I think it's important where video is involved.  That's a signal that's directly affected by the frequencies a cable might pick up, but I'm not so sure about the rest of it.


Edited by tomb - 5/14/15 at 8:11pm
New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › Doodlebug - USB Isolator