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Old 8th March 2012, 04:23 AM   #3221
Pano is offline Pano  United States
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Quote:
Originally Posted by Draki View Post
Anybody else to chip in?
I put about 3.3K after the transformer so that there is a combined load of around 1.5K seen on the primary. It doesn't seem too critical. A Zobel could also work, but I find the 3.3K flattens the impedance just fine.

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Any DC imbalance in the primary circuit will lead to increased distortion as a result of increased saturation of the transformer.
How much DC imbalance do you think there is? How much current will flow thru the primary?
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Old 8th March 2012, 09:17 AM   #3222
AndrewT is offline AndrewT  Scotland
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I don't know the DC imbalance, nor how it might vary with operating conditions.
I don't know the DC resistance of the audio transformer's primary.

Pano,
Do you really expect me to answer your two questions?

Can I assume you are not demanding an answer?
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Old 8th March 2012, 09:44 AM   #3223
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Ok thank's. It works!
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Old 8th March 2012, 06:33 PM   #3224
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Quote:
Originally Posted by AndrewT View Post
I don't know the DC imbalance, nor how it might vary with operating conditions.
Easy enough to measure; put a DCmV meter across the transformer primary. There isn't any. You can connect a transformer directly across the output pins and you're fine.
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Old 9th March 2012, 07:49 AM   #3225
Draki is offline Draki  Macedonia
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Easy enough to measure; put a DCmV meter across the transformer primary. There isn't any. You can connect a transformer directly across the output pins and you're fine.
Thanks for making the effort.
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Old 10th March 2012, 11:02 PM   #3226
Ryssen is offline Ryssen  Sweden
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If I have done a modd ala`Jan Didden (with caps) is it still possible to take an unballanced signal by connecting pin 1 and 3?Or will it hurt the DAC?
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Old 10th March 2012, 11:26 PM   #3227
Pano is offline Pano  United States
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Quote:
Originally Posted by AndrewT View Post
I don't know the DC imbalance, nor how it might vary with operating conditions.
I don't know the DC resistance of the audio transformer's primary.

Do you really expect me to answer your two questions?
Uh... yeah. I was hoping you might know something that I don't. From your answer it just looks like wild speculation on your part. If I get a chance, I'll measure it.

Thanks anyway.
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Old 11th March 2012, 11:33 AM   #3228
AndrewT is offline AndrewT  Scotland
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Not wild speculation.
All audio transformer manufacturers, that I am aware of, warn of the risks of allowing DC into the transformer.
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Old 11th March 2012, 12:37 PM   #3229
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Quote:
Originally Posted by Pano View Post
Uh... yeah. I was hoping you might know something that I don't. From your answer it just looks like wild speculation on your part. If I get a chance, I'll measure it.

Thanks anyway.
Pano, DON'T measure the resistance of a transformer with a multimeter. Indeed, sending DC through the coil (as the multimeter will) may magnetize it and that will increase distortion and decrease induction.
It depends on the type of transformer whether the effect is significant or not, but it's worst for low signal low level transformers like input transformers.

SE output transformers necessarily have DC going through them and they have an air gap to avoid the effects of DC.

jan
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Old 11th March 2012, 12:39 PM   #3230
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Originally Posted by Ryssen View Post
If I have done a modd ala`Jan Didden (with caps) is it still possible to take an unballanced signal by connecting pin 1 and 3?Or will it hurt the DAC?
Are you only taking one phase from the DAC to say pin 2, and leave the other phase alone?
That should be no problem.

jan
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