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When connecting a pair of identical isolation transformers in parallel (to double their capacity), is there a way of physically aligning/placing the transformers (IE core) relative to each other to maximize performance? (I.e., cores "rubbing shoulders", or one rotated at a 90-degree angle to the other, etc.) Any pointers would be greatly appreciated. Thanks!
-- Chris
Follow Ups:
He would not say much about alignment but did say they were at 90º angels relative to each other.
He never sold one, and I was not impressed with the sound in the room were he had this unit. This was in the '70s.
In my opinion, the best way is to maximize the distance between the two, and place the fields at 90 degrees to each other.
The way to do the latter, is to put one mounted on a side wall, and one on the "floor" wall.
In theory, one could deliberately couple them to create a common mode type of situation, BUT, I am on record recommending against this kind of choke configuration for filter inductors, and I feel even more strongly against using it for isolation transformers.
One thing you could do, that should not have any ill effects, and SHOULD reduce core nonlinearities, make sure you reverse wire one of them, that is, connect the input terminals to one of them one way, and then reverse it on the other unit. Of course, you will have to be very careful to ALSO reverse the output leads as well on the one with the reversed input terminals. In any case, you will have to maintain relative polarity through both devices in order to avoid having them fight each other and end up with zero volts output and a blown fuse/tripped breaker.
If none of this is clear, then I wouldn't advise that you parallel them in the first place.
Jon Risch
If I understood you question correctly, I recall Jon mentioning something about distance between them being relevant, but don't recall anything about orientation of IEs or fields.
In my JR clone, I have them parallel, not perpendicular, and they're not widely separated at all. I don't notice anything deleterious, but have not experimented. Insofar as I can tell, having them close and parallel isn't a major problem, but who knows?
Here is a picture of the inside of my MIT Iso Zo digital filter
As you can see there is two circuits which are each double filtered by IE core trannys
Note the trannys are at 90 degrees to each other circuit to circuit ... most likely so their field's don't couple with each other circuit's
I just uploaded the picture and now would have to say I'm not sure which trannys feed which outlets so you'll have to follow the wires
HTH Dave
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