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Old 6th December 2010, 12:55 AM   #371
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Quote:
Originally Posted by Malka07 View Post
Just reread your post Lucas, and noticed that you removed the TL431s...did you notice a difference in SQ?
It's pretty much impossible for me to say, because I don't think the unit could be said to have burned in by the time I removed them. I can say, however, that I have an adjustable voltage now, not determined by the TL431 regulators which are often inaccurate. In my opinion, it is quite unnecessary to have them there. Usually simplification is best in hi-fi I've found, unless there are good scientific grounds to complicate, and in this case there are none that I have heard. The TL431s are in this circuit secondary shunt regulators, quite inferior to the discrete Salas regs and of much higher impedance. The idea behind installing them, I believe, is to avoid intermodulation, which can happen when two loads share a common power source, and a spike of demand on one load then affects supply to the other. This is moot in the case of this design, as both loads are identical devices pulling identical loads for any given millisecond. Salas, the chief moderator of this forum agrees with this, which is good enough for me. He did say, however, to get the Salas shunts as close to the chips as possible and use the best conductors you can to supply them, which to me meant cutting the boards in half, trimming the traces as appropriate, scraping the ends of the traces and soldering .6mm pure silver wires onto them to run the supplies as close as possible. It is not as neat, for sure, but is easy to do and worthwhile I thought.
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Old 6th December 2010, 12:57 AM   #372
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Has anybody got the Twisted Pear SPDIF to i2S board working yet?
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Old 6th December 2010, 06:54 PM   #373
Malka07 is offline Malka07  England
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Quote:
Originally Posted by LucasAdamson View Post
Has anybody got the Twisted Pear SPDIF to i2S board working yet?
Hi Lucas,

I have got the Twisted Pair Spdif to 12s working but with distorted sound...it appears that Oliver may have found the problem.

Quote:
Originally Posted by dvb-projekt View Post
Ive looked deeper on the three modules (TP WM8804, Y1 PCM2707 & X2 TE7022).
All three ICs runs with 3.3V, so thats not the difference.

The X2 is the only one, witch have a BUS Buffer (74HC125) between the converter IC and the I2S output.

On the Twisted Pear and the AMB Y1 pcb lacks this buffer.

I will try to insert such a buffer IC between the output of my TP WM8804 and the I2S input of the DAC module in the next days and report the result.

So just waiting to see if Oliver gets it working, when he has a spare bit of time.

BTW thanks for letting me know about the tl431's...when i get the dac working...i will let it burn in with the tl431's and get used to the sound, then i will try removing them as you did and report if i hear a difference.

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Old 7th December 2010, 09:31 AM   #374
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Originally Posted by Malka07 View Post
So just waiting to see if Oliver gets it working, when he has a spare bit of time.
I just waiting to the 74HC125 from Mouser. They should arrive before the weekend.

I will try to make a small adapter pcb to get it between the TP and the DAC module.

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Old 7th December 2010, 03:11 PM   #375
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Originally Posted by dvb-projekt View Post
I just waiting to the 74HC125 from Mouser. They should arrive before the weekend.

I will try to make a small adapter pcb to get it between the TP and the DAC module.

Thanks Oliver
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Old 7th December 2010, 06:16 PM   #376
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Ernst, you mentioned you have a CCS loaded anode follower for another one of your dac's. I am planning to build one as well, would you happen to have the schematic of the implementation you use (or some info on which tube, feedback yes/no, etc) ?

Btw, did you have any chance to try out ecdesigns mk4 output stage? I have the full kit complete now, only no output stage, so no sound :-(

Thanks!
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Old 9th December 2010, 06:08 PM   #377
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Oliver wrote:

Better dynamics, enhancement of the low end, better 3D soundstage and a deeeep black background. From my side: Highly recommended

Well, I'm glad you like it! (And a bit relieved, to be honest.) Could you possibly answer a couple of questions about it?

1. Regardless of what speeds you normally use (i.e. 44.1KHz), can it pass data to the Teralink at higher rates (i.e. 96KHz)? In theory, you should but, when I tried it, I couldn't. However, I was using an E-MU 0202 and that behaves oddly at times.

2. I bought the pre-assembled version of the board. When you bought yours, did it come with the chip already soldered or did you fit it yourself? (Not sure I'm up to soldering SM devices these days . . . )

Thanks

Dave
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Old 10th December 2010, 05:22 AM   #378
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Hi Dave,

to your questions:


Quote:
1. Regardless of what speeds you normally use (i.e. 44.1KHz), can it pass data to the Teralink at higher rates (i.e. 96KHz)?
In theory, you should but, when I tried it, I couldn't. However, I was using an E-MU 0202 and that behaves oddly at times
Because of my iMac i could use the Pure Music software, witch is able to upsample all input files up to 192KHz/24bit.
Also the 96KHz setting for the X2 is possible and works awesome. I use it in 16bit modus for my TDA1541A DAC.

Quote:
2. I bought the pre-assembled version of the board. When you bought yours, did it come with the chip already soldered or did you fit it yourself?
(Not sure I'm up to soldering SM devices these days . . . )
I solder all chips by myself. If you have the right solder iron, its no problem.

BTW, for all who use also the Teralink X2 and are interested, i made a clock upgrade to the HighEnd Tentlabs XO HERE.

Best regards,
Oliver
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Old 10th December 2010, 03:30 PM   #379
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Originally Posted by studiostevus View Post
Ernst, you mentioned you have a CCS loaded anode follower for another one of your dac's. I am planning to build one as well, would you happen to have the schematic of the implementation you use (or some info on which tube, feedback yes/no, etc) ?

Btw, did you have any chance to try out ecdesigns mk4 output stage? I have the full kit complete now, only no output stage, so no sound :-(

Thanks!
Hi,

I used the design which "Adamus" posted somewhere in the middle of the OLD DACEND2 thread. It is rather simple with 2 fets and 2 resistors, like K&K Audio. Don't remember the Fet type and have not option during the next days to look after. Please search on your own.

I just reduced B+ from 270V to 170 and replaced anode resistor by the CCS, which I set to 15mA. So far my tubes are E182CC and 5687. E182CC in my case is better, smoother with better heights. I January I'm trying 6n6p in the same configuration. For now I admit, sound without CCS is somehow better in the mids and heights, but bass is slightly weaker. So I'll put the resistors back in place.

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Old 11th December 2010, 12:56 PM   #380
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Got it working!

With the missing 74HC125 between the Twisted Pear Opus WM8804 and the DAC modules, it runs like hell.

Click the image to open in full size.

The configuration is as followed

Pin1: to GND
Pin2: Input 1
Pin3: Output 1
Pin4: to GND
Pin5: Input 2
Pin6: Output 2
Pin7: GND
Pin8: Output 3
Pin9: Input 3
Pin10: to GND
Pin11: N.C.
Pin12: N.C.
Pin13: N.C.
Pin14: Vcc (+5V)


Perhaps someone have a nice small DIP14 pcb witch looks better than mine.

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