If you want to create a balanced output from your phono section

Posted by Ralph (M) on September 10, 2014 at 08:13:27

In Reply to: RE: rca to xlr posted by backendloaded on September 10, 2014 at 07:59:00:

You have several choices:

1) you could use some sort of transformer to do the job. This is really not a bad idea. There are a number of ways to do this, for example you could have a transformer made that can be the plate load for the final stage of gain (which means that the transformer has to be designed to have the DC current go through it).

2) Or you could have the conventional coupling cap, which then drives the transformer.

In either of these cases the secondary of the transformer is tied to pins 2 and 3 of the XLR; pin 1 is circuit ground and not connected to the transformer at all (unless there is a center tap, but if you were to use that the Common Mode Rejection Ratio would suffer, so don't do it).

3) you could create some sort of phase splitter circuit at the output of the preamp, and use the outputs of the phase splitter to drive pins 2 and 3.

To do this right you will have to do one of the scenarios above. The phase splitter is cheaper, and if done right will perform very well as long as you don't load the output too low. The transformers have the advantage of circuit simplicity and often have the ability to driver lower impedances that are common when you run balanced lines (for that you will need more gain from the phono as voltage will be lost during the step-down of the transformer).

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Follow Ups Full Thread

Topic - rca to xlr - backendloaded 06:20:11 09/07/14 (12)

Here is a cheaper way to set that up that works - Ralph 09:04:28 09/08/14 (0)

RE: rca to xlr - Caucasian Blackplate 20:22:36 09/07/14 (0)

RE: rca to xlr - Eli Duttman 06:59:36 09/07/14 (9)

RE: rca to xlr - backendloaded 08:34:57 09/07/14 (8)

RE: rca to xlr - HotStamper 10:06:18 09/07/14 (0)

RE: rca to xlr - Tre' 08:38:50 09/07/14 (6)

RE: rca to xlr - backendloaded 05:44:43 09/10/14 (5)

RE: rca to xlr - backendloaded 07:59:00 09/10/14 (4)

If you want to create a balanced output from your phono section - Ralph 08:13:27 09/10/14 (3)

RE: If you want to create a balanced output from your phono section - backendloaded 08:23:31 09/10/14 (2)

RE: If you want to create a balanced output from your phono section - Tre' 11:28:02 09/10/14 (0)

RE: If you want to create a balanced output from your phono section - Ralph 08:40:24 09/10/14 (0)

Follow Ups

If you want to create a balanced output from your phono section - Ralph 08:13:27 09/10/14 (3)

RE: If you want to create a balanced output from your phono section - backendloaded 08:23:31 09/10/14 (2)

RE: If you want to create a balanced output from your phono section - Tre' 11:28:02 09/10/14 (0)

RE: If you want to create a balanced output from your phono section - Ralph 08:40:24 09/10/14 (0)

If you want to create a balanced output from your phono section

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