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Looking for unbalanced to balanced transformer
Looking for unbalanced to balanced transformer
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Old 15th January 2012, 04:34 PM   #1
merlin el mago is offline merlin el mago
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Question Looking for unbalanced to balanced transformer

I am looking for unbalanced to balanced transformer like Lundhal, Sowter, etc. Could you recommend me a particular model & the way to connect the wires?
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Old 15th January 2012, 04:46 PM   #2
Pano is offline Pano  United States
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Looking for unbalanced to balanced transformer
Do you need an input transformer? Just about any of good the 1:1 models will do, Jensen, Cinemag, Edcor, Lundhal, old Peerless, etc.

Connect one side of the primary to signal hot, the other to ground. Connect the wires of the secondary to your balanced circuit.
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Old 15th January 2012, 05:04 PM   #3
merlin el mago is offline merlin el mago
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So I just to ask 1:1 models, this one Lundhal LL6404 is OK?

http://www.lundahl.se/pdfs/datash/6404.pdf
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Old 15th January 2012, 05:24 PM   #4
Pano is offline Pano  United States
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Looking for unbalanced to balanced transformer
Yes, that should do the trick. Sometimes you need to connect the center tap to ground, and this model has no center tap. Usually not a problem, tho.
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Old 15th January 2012, 05:25 PM   #5
merlin el mago is offline merlin el mago
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Thank you Pano.
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Old 15th January 2012, 06:35 PM   #6
merlin el mago is offline merlin el mago
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To have a gain of +3 dBs like the balanced signal how many turns ratio must have the step up transformer?
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Old 15th January 2012, 07:03 PM   #7
zigzagflux is offline zigzagflux  United States
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Turns ratio follows voltage ratio. 3dB = 20log(1.41), so that would be 1:1.41 turns ratio. 6dB would be twice the gain [20log(2)], which is 1:2. You will probably be more successful finding a 1:2 step up than a 1:1.41.
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Old 15th January 2012, 07:06 PM   #8
Pano is offline Pano  United States
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Looking for unbalanced to balanced transformer
Yep, I've had some 1:1.41 transformers custom made, but never seen any in a catalog. 1:2 will do fine.
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Old 15th January 2012, 07:13 PM   #9
merlin el mago is offline merlin el mago
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The Lundahl LL7101 can do the trick?

http://www.lundahl.se/pdfs/datash/7101.pdf
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Old 16th January 2012, 12:43 AM   #10
David Davenport is offline David Davenport  United States
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The LL1690 works for me.

http://www.lundahl.se/pdfs/datash/1690.pdf
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