I have a preamp which is balanced and a CD player that has an unbalanced output. I would like to use a Jensen JT11P1 to convert the unbalanced output to balanced at the preamp input side.
What is the best way to wire the Jensen JT11P1?
Jensen schematics suggest that there are two ways; one way to connect the unbalanced signal to the primary and connect 2 and 3 of the XLR to the secondary with a damping network between 2 and 3 along the lines of AN003
http://www.jensen-transformers.com/wp-content/uploads/2014/08/an003.pdf
Another way is outlined in AS060, right side pic
http://www.jensen-transformers.com/wp-content/uploads/2014/08/as060.pdf
What are the pros and cons of each way?
Thanks. nash
What is the best way to wire the Jensen JT11P1?
Jensen schematics suggest that there are two ways; one way to connect the unbalanced signal to the primary and connect 2 and 3 of the XLR to the secondary with a damping network between 2 and 3 along the lines of AN003
http://www.jensen-transformers.com/wp-content/uploads/2014/08/an003.pdf
Another way is outlined in AS060, right side pic
http://www.jensen-transformers.com/wp-content/uploads/2014/08/as060.pdf
What are the pros and cons of each way?
Thanks. nash
Are you converting the Input of the receiver to accept an unbalanced connection?
or are you converting the output of the source to send a balanced impedance signal down the cable?
The first jt11p-1 I found was in 2.3 of an003 and that shows the INPUT of the Receiver converted to accept an unbalanced connection and also accept a balanced impedance signal.
Whereas the right diag of the second link shows the OUTPUT of the source converted to a balanced output to send down a cable.
Notice in both arrangements that the can and the interwinding screen are connected to pin1 and to the enclosure at pin1.
The input conversion uses the damping resistor across the transformer output, slightly higher value+cap.
The output conversion uses the same damping resistor (as 2.2) across the transformer output, but has a centre tap going to pin1.
or are you converting the output of the source to send a balanced impedance signal down the cable?
The first jt11p-1 I found was in 2.3 of an003 and that shows the INPUT of the Receiver converted to accept an unbalanced connection and also accept a balanced impedance signal.
Whereas the right diag of the second link shows the OUTPUT of the source converted to a balanced output to send down a cable.
Notice in both arrangements that the can and the interwinding screen are connected to pin1 and to the enclosure at pin1.
The input conversion uses the damping resistor across the transformer output, slightly higher value+cap.
The output conversion uses the same damping resistor (as 2.2) across the transformer output, but has a centre tap going to pin1.
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you could use the right diag of link2 to convert the OUTPUT to balanced impedance
and then use an003 2.3 to enhance the Input of your balanced.
Or just adopt 2.4 on the Output and save buying any transformers. This relies on the electronic balancing for CMRR. It depends on the quality of your Receiver.
and then use an003 2.3 to enhance the Input of your balanced.
Or just adopt 2.4 on the Output and save buying any transformers. This relies on the electronic balancing for CMRR. It depends on the quality of your Receiver.
My preamp has a balanced connection and the CD player an unbalanced output. I understand that input transformers by design have better screening than output transformers.
That's why I thought I should use an input transformer right next to the preamp and feed it a balanced signal outputting from the transformer. The setup would be just like in fig 2.3 in AN 003 but without the link between pin 3 and pin 1 of the XLR.
Or the arrangement in AS 060 right pic, again this would be located right at the preamp. What does the centre tap going to pin 1 accomplish? How would the transformer output be different if the center tap was omitted but the white and black wires still be connected to pin 1 as shown?
I found this previous discussion in which AS060 has been discussed but dont completely understand it.
http://www.diyaudio.com/forums/anal...line-level-unbalanced-balanced-converter.html
Your help is appreciated.
Thanks. nash
as060 are both outputs
an003 fig 2.3 is an input. They are two different duties.
Which do you want to build?
See what happens when you quote something out of context.
I was confused by Jensen using an INPUT transformer on an Output, until I read your link where Steve Eddy posts
an003 fig 2.3 is an input. They are two different duties.
Which do you want to build?
See what happens when you quote something out of context.
I was confused by Jensen using an INPUT transformer on an Output, until I read your link where Steve Eddy posts
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If you want the balanced impedance benefit of exceptional interference attenuation, then using an INPUT transformer at the input to an electronically balanced receiver, as shown in fig 2.3 of an003 ids as Jensen says "best". If you want the best, then that is their advice.
But that only solves the Receiver end.
You still have the transmit end.
Your CD is unbalanced. You could go active, but the simplest and cheapest is to adopt 2.4 at the CDP's Output.
But that only solves the Receiver end.
You still have the transmit end.
Your CD is unbalanced. You could go active, but the simplest and cheapest is to adopt 2.4 at the CDP's Output.
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The screens and cans of 2.1, 2.2, 2.3 and both of as060 are ALL connected to pin1 and thence to enclosure.
I don't see how you can do other than what Jensen tell you in all five diagrams !
The extra link from pin3 to pin1 is only required if you connect an unbalanced screen at the far end to an unbalanced plug/socket.
If you use a balanced Output on your CDP, I would NOT connect the screen to the signal, anywhere.
I don't see how you can do other than what Jensen tell you in all five diagrams !
The extra link from pin3 to pin1 is only required if you connect an unbalanced screen at the far end to an unbalanced plug/socket.
If you use a balanced Output on your CDP, I would NOT connect the screen to the signal, anywhere.
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