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Old 21st May 2009, 10:36 AM   #521
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Is there any advantage to use 50 VA 2 x 9 V encapsulated printboard transformer over EI universal of same type
I think at least encapsulated would make less noise and interference
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Old 21st May 2009, 12:02 PM   #522
udovdh is offline udovdh  Netherlands
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How to encapsulate a transformer by DIY?
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Old 21st May 2009, 12:25 PM   #523
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Quote:
Is there any advantage to use 50 VA 2 x 9 V encapsulated printboard transformer over EI universal of same type
I think at least encapsulated would make less noise and interference
A (good, see below) encapsulated transformer can be expected as producing less (mechanical) noise.

Good open transformers also dont hum!

Quote:
How to encapsulate a transformer by DIY?
This can not be easily done by DIY, as you need a vacuum to fill all possible gaps inside the windings.

Franz
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Old 21st May 2009, 07:28 PM   #524
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here lundahl 1527xl as a output stage http://headwize.com/projects/showfil...ciuff3_prj.htm

scroll down
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Old 22nd May 2009, 01:26 AM   #525
legarem is offline legarem  Canada
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Quote:
Originally posted by samoloko
here lundahl 1527xl as a output stage http://headwize.com/projects/showfil...ciuff3_prj.htm

scroll down

The 1527Xl is a good transformer but please don't connect it with the center tap to the ground by a capacitor. It doesn't give good sound as the schem used by many here.
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Old 22nd May 2009, 09:04 AM   #526
McGyver is offline McGyver  Poland
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Quote:
Originally posted by legarem

The 1527Xl is a good transformer but please don't connect it with the center tap to the ground by a capacitor. It doesn't give good sound as the schem used by many here.


I also don't think it makes any sense. Also connecting the center tap to the ground by resistor makes DC flow by primary, and it's bad idea. I don't know why Andrea Ciuffoli did it this way.

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Old 22nd May 2009, 10:51 AM   #527
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which Is better to use with this dac LL1690 or LL1527XL
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Old 22nd May 2009, 11:26 AM   #528
legarem is offline legarem  Canada
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Quote:
Originally posted by samoloko
which Is better to use with this dac LL1690 or LL1527XL

LL1690 but it cost more $$$
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Old 22nd May 2009, 12:24 PM   #529
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Hi guys....

I'm a newbie here....

IMHO some body should do a group buy for transformer such as Studer or such cheaper alternatives rather than Lundal. Not everyone afford to spend $$$ specially a non USD country.....

any volunteers..... ???
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Old 22nd May 2009, 03:03 PM   #530
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Quote:
If the core in some way could be biased with some low level HF that could be filtered afterwards, it might work better at low levels.
Maybe, this is the explanation why it sounds sooo terribly good?

Maybe, there is some RF (radio frequency) bias in this application?

That would also explain, why I don't like it, when I use passive filtering in front of the trannies! Remember, my ears roll off at 13kHz.

I dont have a scope here at home to measure RF.

In the meantime, my DAC is built in a box, also I have to open the enclosure to switch the input :-(

Click the image to open in full size.

Franz
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