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Old 13th December 2010, 12:27 AM   #21
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Quote:
Originally Posted by dvb-projekt View Post
Jefery,

your pcb works with +5V (LM1084-5 output = +5V).

What would be interesting is the needed current. BTW, never ever 1A!
Measure the current. If it is under 80mA, you could use the Tentlab plugin shunt.
If itīs more, you could use quanghaoīs Salas shunt here.

I am sure Guido Tent ships also to Taiwan
Hi Oliver, I am using a 12V-1A adaptor for this board at present , the sound quality is very good, I am also sure if I swap the TXCO to Tentlab as you did, sound quality will be much much better, BUT......I am a electronic idiot, I can do a little modification, for example, swap the OP-amp , but if talk about voltage or current, I would rather hang myself....

Oliver, Another question please, my USB sound card is Musiland 01USD, I think if the Teralink X2(before your modification) is better than 01USD, the only reason will be the Teradak TXCO, since I already have a the DSIX board with a better TXCO, do you think I still need to replace 01USD with Teralink X2?

Thanks again.
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Old 13th December 2010, 06:21 AM   #22
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Jeffery,

because i donīt know the Musiland, i couldnīt answer this question.
Perhaps some other members do this comparison.

Best,
Oliver
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Old 14th December 2010, 12:47 AM   #23
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Originally Posted by dvb-projekt View Post
Jeffery,

because i donīt know the Musiland, i couldnīt answer this question.
Perhaps some other members do this comparison.

Best,
Oliver
Oliver,

I have google some forum, some people think Musiland 01USD is better, some people think Teralink X2 is better, what I think is the Teralink X2 you midified is definitely better.

There will be a new USB soundcard of Musiland come out in next few months, it is much better than 01USD, 01USD use 50.000-gate FPGA, 01PSD use 250,000-gate FPGA, same as RME9632.

By the way, Oliver, I saw your flag, you are German, so can I ask you a question about a German audio product via PM?
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Old 14th December 2010, 03:16 AM   #24
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Quote:
Originally Posted by jeffery8341 View Post
By the way, Oliver, I saw your flag, you are German, so can I ask you a question about a German audio product via PM?
Sure you can
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Old 18th December 2010, 02:11 PM   #25
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Default Additional modification added

As posted before, i canceled the original TCXO LC onboard filter in the +5V line,
because the Tentlab XO had itīs own at the socket.

Click the image to open in full size.


2nd modification is the I2S Buffer-IC.

I change the 74HC125 (tPD: 8ns) to the ~53% faster 74VHC125 (tPD: 3.8ns).
This will reduce the added jitter of the Buffer-IC.

At desoldering, i unhitch two solder pads... What a work to fix this problem!

This is no work for rookies

Click the image to open in full size.

So letīs power up and listen again

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Old 19th December 2010, 03:49 PM   #26
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Originally Posted by dvb-projekt View Post

So letīs power up and listen again

Curious waiting for sq info ;-)
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Old 19th December 2010, 09:18 PM   #27
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Iīve made a small SQ info in my Reference DAC thread.
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Old 20th December 2010, 05:35 PM   #28
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Default Last modification added

Now my last modification is done.
The X2 getīs now the 2nd Salas shunt regulator for the 3.3V line.
Therefore the onboard 3.3V reg. and the 100ĩF cap on itīs output is canceled.

Click the image to open in full size.

The +5V salas shunt reg goes directly to the downlink side of the USB-Isolator and from there over the USB connector into the X2.

Click the image to open in full size.

Here you see the shunt modules. The upper one for the +5V line (USB-Isolator downlink & X2), the lower one for the 3.3V line (X2 Tenor chip).

Click the image to open in full size.




Jesus Christ... ...What an improvement!
That kicks me out of my chair

My recommendation:
Never, and i mean never, let the X2 play with the onboard voltage regulators,
especially the 3.3V one!

I must go back to my chair and listen again
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Last edited by dvb projekt; 20th December 2010 at 06:00 PM. Reason: SQ info added
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Old 20th December 2010, 07:22 PM   #29
glt is offline glt  United States
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Nice project!. Questions: Since the chip is a 3.3v chip, are you feeding a 5V clock? Thanks.
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Old 20th December 2010, 08:10 PM   #30
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Originally Posted by dvb-projekt View Post
Now my last modification is done....

Jesus Christ... ...What an improvement!
That kicks me out of my chair

My recommendation:
Never, and i mean never, let the X2 play with the onboard voltage regulators,
especially the 3.3V one!

I must go back to my chair and listen again
Oliver, wow, thanks for your listening impression! I'm really looking forward to applying the mods.......

Cheers Ernst
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