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Transports / Re: Raspberry PI transport with I2S output into TDA1541A
« Last post by stevenvalve on January 22, 2020, 11:14:00 PM »
So true, get some lose some, does that not piss you off. Unfortunately i lost what i loved
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Resistors / Re: Resistor games
« Last post by stevenvalve on January 22, 2020, 11:12:13 PM »
Great resistors, but new they can sound a bit dark for a few days, but clean out nicely, i use them in tuning,  in only the right positions till the balance is right. Let us know what you think of them, but only after run in.
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Resistors / Re: Resistor games
« Last post by data on January 22, 2020, 03:30:31 PM »
Waiting on some AB resistors for some positions in my amp, I haven't used them before but from what I read here and others experiences I'm chomping at the bit to install them once they arrive  :)
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Transports / Re: Raspberry PI transport with I2S output into TDA1541A
« Last post by data on January 22, 2020, 03:27:11 PM »
I have been doing some serious listening to Danny's Computer transport and its incredibly clean and clear, You can certainly hear a lack of mechanical noise, and a certain smoothness results. But after listening to the Wadia transport with the vintage chips, the same chips as the marantz 94s ect. These early chips are made like the TDA1541 and it shows. These are bigger than the TDA and have the same kind of lower midrange weight and gut gravel in the voice. They are coarser and a little ruff but so real with real flesh and bone, real body, and most impressive...... Dynamics. Its a shame we can not have the best of both worlds. Pictures of Danny working on the computer transport.
I moved from a PC and DAC to vinyl, and now to a CD player, I'm not in a hurry to move back to PC as a source for similar reasons.

When I used a PC I had what I perceived as a quieter background but I lost something else.
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Transports / Re: Raspberry PI transport with I2S output into TDA1541A
« Last post by zenelectro on January 17, 2020, 11:34:30 PM »
I have been doing some serious listening to Danny's Computer transport and its incredibly clean and clear, You can certainly hear a lack of mechanical noise, and a certain smoothness results. But after listening to the Wadia transport with the vintage chips, the same chips as the marantz 94s ect. These early chips are made like the TDA1541 and it shows. These are bigger than the TDA and have the same kind of lower midrange weight and gut gravel in the voice. They are coarser and a little ruff but so real with real flesh and bone, real body, and most impressive...... Dynamics. Its a shame we can not have the best of both worlds. Pictures of Danny working on the computer transport.

If you are struggling to get musicality out of the old Jlsounds board (which it looks like you have) then the new one will be more challenging as IMV it is even more
in the direction you are describing. I have one here ATM, they are super clean and there is a bit of HF edge which I'm not liking, trying to smooth that out . 

I think your best option might be to contact Pedja Rogic at Audial and see if he is still selling his USB to simultaneous board. These boards are really good and have full
isolation, reclocking and good clocks. They will sound different to the JL board and I think better WRT musicality. They are also larger and easier to work on. 

Unfortunately they are not cheap.

Cheers

Terry
 
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Transports / Re: Raspberry PI transport with I2S output into TDA1541A
« Last post by stevenvalve on January 11, 2020, 01:02:42 AM »
We ran 48kHz into the KillerDac, I have never heard it sound do good. Computer audio has arrived. It just annihilated any computer audio system i have ever heard. No actually it annihilated any front end i have heard. I guess it always should have in theory and it finally did.
I have been doing some serious listening to Danny's Computer transport and its incredibly clean and clear, You can certainly hear a lack of mechanical noise, and a certain smoothness results. But after listening to the Wadia transport with the vintage chips, the same chips as the marantz 94s ect. These early chips are made like the TDA1541 and it shows. These are bigger than the TDA and have the same kind of lower midrange weight and gut gravel in the voice. They are coarser and a little ruff but so real with real flesh and bone, real body, and most impressive...... Dynamics. Its a shame we can not have the best of both worlds. Pictures of Danny working on the computer transport. 
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Transports / Re: Raspberry PI transport with I2S output into TDA1541A
« Last post by dannydigital on December 17, 2019, 05:31:05 PM »
Had SV, KLE and CC around today for a listen.

Rolled the output tubes on the KD,, played with power cables and IC's,, added some some super tweeters,,,,,

The raspberry pi wifi transport communicated all changes transparently.

Usb is redundant.  8)

Was lovely having you guys over this arvo.   Steps forward were made.

Hey Mr Oz,

Just interested in what media player you are using with your Raspberry Pi and what system are you loading on to it?
:D Cheers :D
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Transports / Re: Raspberry PI transport with I2S output into TDA1541A
« Last post by dannydigital on December 14, 2019, 02:39:59 PM »

You are not quite understanding how the whole thing works.

As I pointed out in last post, the 'old' JLsounds board (that you have) reclocks all I2S signals with a discrete flip flop chip. From memory it was LVC (but can't recall exactly).

So in fact your I2S lines to DAC have only 1 LVC logic chip between clock and DAC. That's why it sounds so good. :) 
Given this, the MUX switching chip could well make quite a difference. The only way to know is try.
 
The new board I2S has reclocking inside FPGA chip. I believe they take great care to keep jitter low but it won't be as good as a discrete FF logic chip.


Terry,

I understand exactly what you are saying wrt the differences implemented in the clocking o/p's of the two boards.
I'm not using the old board in this project.
Saving it for something else.

Ideally it would be best to have the USB board mounted right above the TDA1541 and extend the USB port to the rear panel instead but this is a retrofit project and I'm taking into consideration some practicality with the fitout.
Time to enjoy the results, using foobar2000remote on my phone. This is brilliant, it gives you full control of the system and allows full access in to the PC's directory structure. Can play whatever you have on your laptop, maybe network drives too, I will have to check this.

Fun fun fun! :) :D ;D
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Transports / Re: Raspberry PI transport with I2S output into TDA1541A
« Last post by dannydigital on December 14, 2019, 02:14:17 PM »
Well the older I2SoverUSB board won't do rates past 96kHz with the TDA1541. I asked Lyuben about this and his reply was;
 
"For a pity I don't have a PC with windows 7 anymore. As you know on our old board you can use it only as I2S to TDA1541. Your configuration is correct of TDA1541.
Can you install new Thesycon driver and adjust the buffer to be bigger?"

I set up a new WIN10 system and tried his recommendation as above plus tinkered with some other ideas but to no avail. When I try to input 176.4kHz or 192kHz signals it's noise. At 176.4 you can make out the music but it's heavily distorted.
I think it's a firmware issue in his module which could be fixed to support the higher rates but obviously Lyuben wouldn't be concerned about that. It doesn't really matter anyway as for the TDA1541 I think it's good enough.
Athough it would be nice for it to work to it's full potential since it can only operate in multiplexed mode 192kHz being the max.

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Transports / Re: Raspberry PI transport with I2S output into TDA1541A
« Last post by zenelectro on December 14, 2019, 12:11:24 PM »
Terry,

The switching of SPDIF & USB feature was implemented purely for convenience as some would still prefer for their DAC to be compatible with legacy SPDIF devices, so that's my thought about that.

Yes, that's right. My point was by having spdif compatibility, you give away some amount of performance in USB mode. The difficult thing with
all this clocking / jitter biz is it's hard to get a perspective on what really matters. We are for the most part just listening which gets really tricky
with jitter. It would be great to have a phase noise test set but that's a lot of money :)   

Quote

In regards to the logic type used, I used HCT series which is what I had available, sure ACT would have been faster but I wasn't going to fuss over a single logic chip when compared with the digital signal traveling through LSI IC's like the Xmos > Xilinx which contains zillons of them.


You are not quite understanding how the whole thing works.

As I pointed out in last post, the 'old' JLsounds board (that you have) reclocks all I2S signals with a discrete flip flop chip. From memory it was LVC (but can't recall exactly).

So in fact your I2S lines to DAC have only 1 LVC logic chip between clock and DAC. That's why it sounds so good. :) 
Given this, the MUX switching chip could well make quite a difference. The only way to know is try.
 
The new board I2S has reclocking inside FPGA chip. I believe they take great care to keep jitter low but it won't be as good as a discrete FF logic chip.

Quote

With regards to the USB bridge, I am using the latest I2SoverUSB v.III board from Lyuben with the Xilinx re-clocking. (I ordered them just a month or two ago, they're a lot more versatile.)

http://jlsounds.com/products.html

I have one of the old boards too which I'm planing for another project.

I've only been able to get the old board working up to 96kHz with the TDA1541. Have you tinkered with these older ones? (using the  TDA1541)

Yes, I've had new and old boards working fine with TDA1541.

You should be able to get 192k / I2S from both and 384k / simultaneous from the new one.
Yep the new one is very flexible for just about any DAC out there.

My aim is to get a PCM1792 running native DSD256 (11MHz) with new board. 

All good fun.

TCD




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