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Output transformers for DACs
Output transformers for DACs
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Old 18th November 2019, 09:39 PM   #301
randytsuch is offline randytsuch
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Output transformers for DACs
Quote:
Originally Posted by TioFrancotirador View Post
@bisesik

Ivan does you trafo for DSC will also work with this new project ?
STAR Pure DSD DAC-Signalyst New
I think the difference is on the front end. Quanghao/Andrea added the ct7302 to generate the dsd stream.

Or did I miss something?
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Old 18th November 2019, 09:46 PM   #302
nautibuoy is offline nautibuoy  United Kingdom
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Quote:
Originally Posted by randytsuch View Post
I think the difference is on the front end. Quanghao/Andrea added the ct7302 to generate the dsd stream.

Or did I miss something?
Yes, that's what I see too. The only variation on the output seems to be the inclusion of a relay to enable single-ended or balanced output to be selectable.
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Old 19th November 2019, 03:59 AM   #303
yunyun is offline yunyun
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Quote:
Originally Posted by lindamar View Post
Thank you bisesik !

I will pm you then. I was not hoping a price like the chineese ones, don’t worry
In fact, there are more expensive transformers on Taobao. It uses 0.06mm 5N OCC and a 12.5~24mm thick core.

Primary resistance: ~ 1340 Ohms
Primary Inductance: ~ 1100-1200 Henry
FR 10Hz ~ 100KHz -0.2DB.


2 coils with PCB and Shield: 71~242 USD


5N单晶铜OCC漆包线绕制的美国Jensen战神10K:10K音频变压器复刻版
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Old 19th November 2019, 01:48 PM   #304
casshan is offline casshan  Hong Kong
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Quote:
Originally Posted by paoloilpizzo View Post
I recognise most of the components in the picture but not the board under the tower raspi + DAC + transformers
What is it?
It is Neutron Star 2 Reference Clock
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Old 19th November 2019, 10:53 PM   #305
clay-speakers is offline clay-speakers  Australia
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I have just tried bisesik's 0.5+0.5:4 PELSHO transformers with a new AK4499
DAC I am developing.
The results were very impressive.
I achieved 2v rms out using a 1k8 resistor across the secondary winding.
The DAC is configured in the register's for dual mono & I use the dual primary windings
to mix each pair of outputs from the AK4499.
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Old 19th November 2019, 11:09 PM   #306
pinnocchio is offline pinnocchio  Canada
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@clay-speakers : will you have this AK4499 DAC for sale as DIY project?

Thanks
Do
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Old 19th November 2019, 11:42 PM   #307
paoloilpizzo is offline paoloilpizzo  Italy
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Quote:
Originally Posted by casshan View Post
It is Neutron Star 2 Reference Clock


Wow !!!
In which way did you connected the clock to fifopi ? Can you post some photos?
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Old 20th November 2019, 12:03 AM   #308
clay-speakers is offline clay-speakers  Australia
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Do - I normally just build finished units but I have been thinking about DIY/shortform kits
lately so I will give it some thought.
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Old 20th November 2019, 12:06 AM   #309
pinnocchio is offline pinnocchio  Canada
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Quote:
Originally Posted by clay-speakers View Post
Do - I normally just build finished units but I have been thinking about DIY/shortform kits
lately so I will give it some thought.
That would be amazing!
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Old 20th November 2019, 08:22 AM   #310
bisesik is offline bisesik  Kazakhstan
Output transformers for DACs
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Output transformers for DACs
Here are comparative measurements with stock transformers. Nothing have changed during measurements - conditions are the same for both measurements.

1k_bisesik_vs_stock.jpg

Warning! This level of -10dB (0.62Vrms) was chosen due to highest SNR possible in my particular setup. I do not pretending for the best absolute measurings or exclusivity of my particular stand - it was just to compare transformers in the same conditions. Relation of THDs will be saved at any output level.
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