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Old 9th November 2010, 07:18 PM   #261
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Originally Posted by Malka07 View Post
Nice initial review of first listen to the dac Lucas...definitely would give it time for parts to burn in before really judging it though...but from what your saying...your already very happy with it

With regards the 431shunts...i also think that if you can connect the Salas shunts directly(bypassing the 431shunts) that it would sound better. Providing the connections from Salas shunt to dac board was kept very short.
So im looking forward to your comparision, with 431's and without...after burn in of course.



The way i understood Thorstens comment was that, He was not familier with the Salas shunt and so suggested the above. However those of us who have used the Salas shunt know it is damn good at what it does, so as long as the connections are kept short i believe there will be an improvement. I guess the only way to find out is by trying it.

I will wait to hear what you think of the differences Lucas and then may try it myself too.

Alon
That's exactly how I read it too - Thorsten wasn't familiar with the Salas shunts, nor their renown, and so assumed them to be fairly standard stuff. Those of us with experience of these shunts know that they are top notch. Even for double DAC, there is no intermodulation, because both loads are identical in current draw per millisecond, so secondary shunts are needless. I've just been discussing it with Salas on his shunt reg. page if you want to read what has been said about this. I always felt to do this as a hunch if nothing else, and now I am quite sure of it.

Regarding my rambling review, yes it's amazing the issues it had when first switched on, and how just two hours later things had opened up. I've never really noticed burn-in to this extent on anything else I've built - it really changes over time, including some distortions disappearing. I wonder which components in particular change over time and heat. My guess is transistors, like the DAC chip itself.
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Old 9th November 2010, 07:41 PM   #262
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5m USB cables don't work - they carry power (of sorts) but computer doesn't register Teradak with 5m cable.

The USB spec calls for the host to be able to supply 500 mA and for the cable to be able to carry it. (IIRC, the 5-metre limit is down to issues with propagation delay.)

I note that the Teralink takes ~350 mA. It might just be drawing more than your Macbook can deliver over a lengthy cable. It happens. (If OTOH the Teralink is separately powered, you can safely ignore the above . . .)

Whatever, with DD's USB-to-I2S module, I got a very significant improvement by using this device to connect the USB link:

ADuM4160 USB Isolator board, populated « Circuits@Home

For 'scope traces, see Step 5 here:

ADuM4160 USB Isolator Assembly Guide « Circuits@Home

The effort to "tune" a USB port certainly matters with audio which is typically a "real-time" process. Though my experience is with a PC, Mac users report significant improvements from various tuning procedures.

It seems a shame to sell the farm to build a top-of-the-range DAC and not, sooner or later, feed it the best possible signal.
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Old 9th November 2010, 08:16 PM   #263
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Default USB Cable

Lucas,

I use an active repeater Cable, which is 5m long plus 1m normal USB cable as an extention. No problem to recognize the Teralink X2, when powered by USB!!! Just tried it and it worked.

The brand is DIGITUS: DIGITUS USB 2.0 repeater cable | Digitus

Price: around 7 Euro.

Btw, I doubt, that Hama products are made in Germany. Maybe I am wrong, but they probably buy their stuff, where all the world is buying currently....

Cheers Ernst
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Old 10th November 2010, 08:46 AM   #264
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Quote:
Originally Posted by Ryelands View Post
5m USB cables don't work - they carry power (of sorts) but computer doesn't register Teradak with 5m cable.

The USB spec calls for the host to be able to supply 500 mA and for the cable to be able to carry it. (IIRC, the 5-metre limit is down to issues with propagation delay.)

I note that the Teralink takes ~350 mA. It might just be drawing more than your Macbook can deliver over a lengthy cable. It happens. (If OTOH the Teralink is separately powered, you can safely ignore the above . . .)

Whatever, with DD's USB-to-I2S module, I got a very significant improvement by using this device to connect the USB link:

ADuM4160 USB Isolator board, populated « Circuits@Home

For 'scope traces, see Step 5 here:

ADuM4160 USB Isolator Assembly Guide « Circuits@Home

The effort to "tune" a USB port certainly matters with audio which is typically a "real-time" process. Though my experience is with a PC, Mac users report significant improvements from various tuning procedures.

It seems a shame to sell the farm to build a top-of-the-range DAC and not, sooner or later, feed it the best possible signal.

Hi Ryelands,

very interesting advice!
So this device could be powered by the USB host, if i powered my X2 with an external PS, right?
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Old 10th November 2010, 10:27 AM   #265
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So this device could be powered by the USB host, if i powered my X2 with an external PS, right?

No - best to use the 5-volt line to the X2 (it only draws ~10mA) - or its own PSU though I doubt that's necessary. I can't do it now but I'll try to post later a pic of one connected to a DD module.

The idea is that the host PC is isolated by the chip's transformers on both the Gnd and +5v.


* I haven't tested it at >48 KHz sampling rates and so cannot promise it will work at 96 KHz though the specs suggest it should. But at 44.1/48, it works very well indeed and markedly improves the sound.
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Old 10th November 2010, 04:56 PM   #266
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I will give it a try and have ordered the "isolator only" parts kit.
The downlink (X2) side will be powered by my +5V shunt reg module.
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Old 14th November 2010, 05:29 PM   #267
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With the + 5 volt regulator can values other than 220uf be used?
TIA
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Old 14th November 2010, 07:02 PM   #268
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With the + 5 volt regulator can values other than 220uf be used?
TIA
Of course. Always. What did you have in mind?
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Old 14th November 2010, 08:55 PM   #269
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Originally Posted by LucasAdamson View Post
Of course. Always. What did you have in mind?
I have 470uf Silmics and Oscons both 16 volt.

Keith
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Old 14th November 2010, 09:40 PM   #270
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Salas is, of course, the best person to consult about this, but he tends to advise for a much smaller, preferably polypropylene cap for the CCS position (nearest input) and a larger electrolytic in the other position. In the DCB1 power supply, for example, which is a Salas low voltage shunt regulator for a DC 10v load, the CCs cap can be any value between 0.22uF and 100uF, and the second is usually 100uF. The values will change the sound significantly. 470uF is very large for this application.
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