K&K Audio / Lundahl Transformers

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LL1689AM side by side - crosstalk?

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Posted on October 27, 2019 at 01:00:21
Andy Nehan
Audiophile

Posts: 40
Location: England
Joined: December 27, 2007
 I am making a headphone amplifier based round the Raven and using LL1689AM as the output transformers.
I want to put them side by side (end-on so to speak) but don't want inductive coupling to create crosstalk. Is there a "safe" distance or should I be very cautious and mount them in a V shape (right angled V)and with a small gap (1cm) between them.

Thanks

 

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RE: LL1689AM side by side - crosstalk?, posted on October 27, 2019 at 17:16:52
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 Hi Andy,

To orient the transformers for minimum crosstalk place one at right angles to the other. Distance obviously helps, too.

However, at the signal levels required by headphones I would guess there would be little problem even if they were side-by-side.

A flattened piece of a steel soup can placed between would ensure no discernable crosstalk.


Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: LL1689AM side by side - crosstalk?, posted on October 29, 2019 at 14:47:52
Andy Nehan
Audiophile

Posts: 40
Location: England
Joined: December 27, 2007
 Super, thanks very much. I will be able to place them over 2 inches apart so that should be just fine.

Andy

 

RE: LL1689AM side by side - crosstalk?, posted on January 2, 2020 at 07:27:00
jeffwags818@gmail.com
Audiophile

Posts: 1
Location: Oregon
Joined: January 2, 2020
 I am curious, I was under the impression that magnetic fields can not be blocked but only redirected. So that in order for the steel soup can to shield the transformer it would have to wrap around the transformer and be attached to ground. Is this not the case? And I am very much asking, not debating one side over the other.

Great article on this : https://www.kjmagnetics.com/blog.asp?p=shielding-materials

I am interested in any examples of where you shielded something successfully and how it was done.
____
Jeffrey Wagner

 

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