Tweakers' Asylum

power wraps

63.16.55.189

unclestu52

In Reply to: RE: DIY damping in power cords. posted by Al Sekela on September 22, 2007 at 15:10:53

can be emulated by wrapping strips of Mu metal around power cords, using a right hand twist. I then use copper tape, conductive adhesive to hold the mu metal to the cable body. I also ground the end of that copper strip for good effect, using a bit of heat shrink to keep everything very tight.

As you point out, the noise floor of the AC drops.

BTW, the Shun Mook cable jackets follow the same principles, for the most part.

Stu

Follow Ups:

AFAIK, mu-metal does not like to be bent. - Al Sekela 16:12:46 09/27/07 (2)
It undergoes a special hydrogen annealing process to achieve the high permeability. Mechanical deformation may disrupt the grain alignment and reduce the permeability. See the Wikipedia article on mu-metal.
- You're right and it is - unclestu52 22:27:17 09/27/07 (1)
  definitely true with mu metal plate, not so with mu metal foil. If the bend radius is kept within 4 to 8 times the material thickness, the effects are minimized.
  
  I use mu metal foil 10 mil in thickness, with very little ill effect. The bonus is that it is also very flexible and can follow the outer jacket of a PC quite well. In placing the copper foil tape over it and using heat shrink over the ensemble, the PC remains flexible but is still dampened. I generally follow up with braided polyester sleeving to give a finished look and the cable looks and mechanically acts quite normally, just a wee bit stiffer.
  
  Stu
  - Thanks! (nt) - Al Sekela 18:22:26 09/28/07 (0)
    :)

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