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Klimon 8th April 2007 12:39 PM

PS choke magnetic induction
Hi guys,

I just discovered the layout of my new diy amp isn't all that great.... There's a big distance between the second cap of the PS and the next cap of one channel, about 20cm = 8", and the shortest road is right next to the PS choke.

Could it be worthwile to lay the wire so that it crosses the choke in a particular angle versus it's magnetic core, or in general, will the choke cause some kind of noise/ humm in the wire through magnetic induction? It's a SE baby....

As always; a million thanks!!!!



Klimon 8th April 2007 10:16 PM

bump (for the Americans fast asleep on the other side of the globe at the time of my post)


BudP 9th April 2007 05:56 AM


In a general sense, looking at an E/I core anything, the strongest stray field will be from gap to gap across the long side of the core. In a fully gapped choke, the long side immediately adjacent to the two end gaps (the I's) will have a slightly stronger field than the longer path around the E portion.

In general again, the short side of the core perimeter emits 1/8th the power of the long side. These are mid point measurements. The coil face emits 1/8th the power of the short side of the core perimeter and the joint between core face and coil is another 1/8 th loss.

So. you would be best served by elevating the wire slightly and running parallel to the face of the core, under the coil and about 1mm back from the coil face edge. This is usually a plastic bobbin but might not be in your case. Next best is past the short side, at a right angle to the core edge and about 1/4 th of the way up the core from the mounting plane. That is true unless the gap is on the side closest to the mounting plane. You do want to keep your wire away from the gap. You also do not want to run it across the coil face if possible, The coupling will be less than if you ran it through the window but likely still noticeable. Mostly, just experiment with angles of incidence and the core edges and face, under the coil. The farther from the choke the better.


Klimon 9th April 2007 09:45 AM

Cheers Bud. This 'll require some thinking do get it right..


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