Looking for unbalanced to balanced transformer

merlin el mago · 15th January 2012, 03:34 PM

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?

Pano · 15th January 2012, 03:46 PM

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.

merlin el mago · 15th January 2012, 04:04 PM

So I just to ask 1:1 models, this one Lundhal LL6404 is OK?

http://www.lundahl.se/pdfs/datash/6404.pdf

Pano · 15th January 2012, 04:24 PM

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.

merlin el mago · 15th January 2012, 04:25 PM

Thank you Pano.

merlin el mago · 15th January 2012, 05:35 PM

To have a gain of +3 dBs like the balanced signal how many turns ratio must have the step up transformer?

zigzagflux · 15th January 2012, 06:03 PM

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.

Pano · 15th January 2012, 06:06 PM

Yep, I've had some 1:1.41 transformers custom made, but never seen any in a catalog. 1:2 will do fine.

merlin el mago · 15th January 2012, 06:13 PM

The Lundahl LL7101 can do the trick?

http://www.lundahl.se/pdfs/datash/7101.pdf

David Davenport · 15th January 2012, 11:43 PM

The LL1690 works for me.

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

15th January 2012, 03:34 PM	#1
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Blanes - Costa Brava	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?

15th January 2012, 03:46 PM	#2
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	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. __________________ Take the Speaker Voltage Test!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Looking for unbalanced to balanced transformer	merlin el mago	Parts	9	21st January 2012 02:48 AM
Looking for unbalanced to balanced transformer	merlin el mago	Analog Line Level	6	20th January 2012 01:40 PM
Unbalanced to balanced transformer before UCD?	sharpi31	Class D	12	5th April 2011 07:07 PM
using a transformer for balanced to unbalanced conversion	h_a	Analog Line Level	47	9th January 2007 10:16 AM
Balanced to Unbalanced w/ Transformer?	lgreen	Solid State	9	6th January 2004 04:37 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

15th January 2012, 04:04 PM	#3
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Blanes - Costa Brava	So I just to ask 1:1 models, this one Lundhal LL6404 is OK? http://www.lundahl.se/pdfs/datash/6404.pdf

15th January 2012, 04:24 PM	#4
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	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.

15th January 2012, 04:25 PM	#5
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Blanes - Costa Brava	Thank you Pano.

15th January 2012, 05:35 PM	#6
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Blanes - Costa Brava	To have a gain of +3 dBs like the balanced signal how many turns ratio must have the step up transformer?

15th January 2012, 06:03 PM	#7
zigzagflux diyAudio Member Join Date: Oct 2006	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.

15th January 2012, 06:06 PM	#8
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Yep, I've had some 1:1.41 transformers custom made, but never seen any in a catalog. 1:2 will do fine.

15th January 2012, 06:13 PM	#9
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Blanes - Costa Brava	The Lundahl LL7101 can do the trick? http://www.lundahl.se/pdfs/datash/7101.pdf

15th January 2012, 11:43 PM	#10
David Davenport diyAudio Member Join Date: Jun 2004 Location: Raleigh North Carolina	The LL1690 works for me. http://www.lundahl.se/pdfs/datash/1690.pdf

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)