[time-nuts] Noise and non-linear behaviour of ferrite transformers

Max Robinson max at maxsmusicplace.com
Sun Jul 20 02:03:49 EDT 2014


I don't know if this has any application for you or not but here it is.  I 
have had ground loop problems between the power safety ground and the TV 
Cable shield.  I used two 300 to 75 ohm transformers and coupled their 300 
ohm sides with 27 pf capacitors.   I put them in an aluminum box with only 
one of the shield sides connected to the box.  It didn't degrade the picture 
by any detectable amount and completely eliminated the hum that had resulted 
from the ground loop.

Regards.

Max.  K 4 O DS.

Email: max at maxsmusicplace.com

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----- Original Message ----- 
From: "Attila Kinali" <attila at kinali.ch>
To: <time-nuts at febo.com>
Sent: Saturday, July 19, 2014 5:09 PM
Subject: [time-nuts] Noise and non-linear behaviour of ferrite transformers


> Hi,
>
> I'm currently looking at some way of breaking the ground loop between
> several systems. The obvious idea would be to use transformers. I would
> like to have some kind of rule of thumb to guess how much noise such
> a transformer would add. But unfortunately i cannot find any theory
> or measurements of this. Does anyone have some pointers to documents
> on what kind of noise i could expect (type, and strength) and
> what/how strong the non-linear behaviour of transformers would be?
>
> Thanks in advance
>
> Attila Kinali
>
> PS: although this started as something with a real application in mind,
> i'm now interested in this as an endavour of its own. So all and any data,
> theory or rule of thumb would be appreciated
>
> -- 
> I pity people who can't find laughter or at least some bit of amusement in
> the little doings of the day. I believe I could find something ridiculous
> even in the saddest moment, if necessary. It has nothing to do with being
> superficial. It's a matter of joy in life.
> -- Sophie Scholl
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