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Old 12th July 2018, 12:06 PM   #1881
cdsgames is offline cdsgames  Canada
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Join Date: Jun 2015
Quote:
Originally Posted by freezebox View Post
Hello cdsgames, I have ordered this ones: SN74LVC1G14DBVR. In SPEC I cannot find anything about Phase noise..
http://www.ti.com/lit/ds/symlink/sn74lvc1g14.pdf

Based on your recommendation to put a buffer between clock and DAC and based on Markw4 proposal to do this with such schmitt Trigger I ordered this part. Raising time seems to be lower than that of NDK clock, so I thought I give it a try... If you have a better proposal (I am sure you have..;-)), pls. let me know.

On the Boss we used NB3L553
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Old 12th July 2018, 02:32 PM   #1882
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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I see some people have changed the on-board NE5532 for a LME49720, how have you found this upgrade now you've have time to listen to it - worthwhile?

Has anyone replaced the NE5532 with a discrete solution? If so, how are you finding it?

What about the LME49860, has anyone tried using one of those as I read that it is better than the LME49720.

Last edited by Ian Greenhalgh; 12th July 2018 at 02:35 PM.
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Old 12th July 2018, 03:58 PM   #1883
Markw4 is offline Markw4  United States
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Quote:
Originally Posted by cdsgames View Post
On the Boss we used NB3L553
Interesting. The specs suggest it is schmitt triggered based on input switching thresholds and output transition times, but they don't say that it is in plain language. Probably an excellent choice to speed up slow clock transitions.
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Old 12th July 2018, 04:11 PM   #1884
cdsgames is offline cdsgames  Canada
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Dont forget that buffer is same as clock. It needs a very clean rail otherwise there is no advantage in using it. Btw LDOs only (even the lt3042) is not enough to clean a rail for a clock. Hint..(they run at mhz speeds)
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Old 12th July 2018, 04:17 PM   #1885
Markw4 is offline Markw4  United States
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Right, the usual considerations for high performance, fast parts: minimize input noise pickup, and use proper bypassing, ground plane, and ideally power plane(s) too.

Last edited by Markw4; 12th July 2018 at 04:19 PM.
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Old 12th July 2018, 04:25 PM   #1886
Ian Greenhalgh is offline Ian Greenhalgh  United Kingdom
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Would the way to get a very clean rail for such a buffer be to give it it's own, isolated power supply?

I ask because I'm about to start putting my power supply for the main dac board together and while I'm aware that multiple, isolated power supplies to different parts of the system is a superior design path to take, I'm still not quite clear on which parts of the system should be given their own power supplies.

Am I right in thinking that the most basic approach to multiple PSUs is to power the dac board and analogue stage separately, each from it's own isolated PSU?
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Old 12th July 2018, 07:14 PM   #1887
pentajazz is offline pentajazz
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About the su5 first impressions, on a not so revealing system, it is an upgrade from a lower spec and price dac. At first .. not excited but not disappointed either, so not an exceptional for the price dac, but not bad either. Previously Markw4 compared it with Benchmark reference DAC , and found this to have some kind of "distortion" (joke?)...

I would say you need to warm the unit a bit, more than 10 hours, so do not blame it for the very beginning. Some good parts inside, some maybe good quality capacitors, unit as previously described with 2x op275 opamps at RCA/headphone output and 2x ti TL072c at the so called I/V.

I cannot express a clear opinion neither this is an objective review, mostly because I use it with an external xmos USB to SPDIF with better TXCO crystals: http://essabre-90xx-rpi.sfb2.com/201...riences-win10/
+
A tube buffer with 2x Voskhod 70s USSR valves
+ extensive use of VSTs specially selected for my needs/room corrections (console emulations, EQ, Center/LR stereo imaging etc) as a result of music production experience, not electronics.

tested a bit up-sampling to see if there is real benefit at my case, cannot say anything special right now or hear an obvious difference (only 44.1 to 88.2 as 176 is a bit unstable at SPDIF)

So,
1. I was wondering if someone can have a view or idea if changing the RCA out OPAMP with an adapter like this: 10pcs DIP8 to SOP8 Adapter SOIC8 socket pcb 1.27mm PCB converter 300mil | eBay
could get any better/different sound out of this...

2. Is there a real benefit by creating an i2s link between the 2 devices instead spdif? What kind of plugs/cable will I need? As only USB 44.1/16 audio will be used, so I guess spdif is ok. But then I could avoid spdif chip and get some higher and stable upsampling for experiments. I do not know if it is a worthy move. Foobar2000->real time DSD translation has drop outs at spdif (DSD64 only) so no real test can be done for DSD .

Finally I would like to note that the internal xmos USB board works only with the class2 3.20 driver and not with the 4.36 that happens to work with the skysong board.
Singxer_USBAudio_v4.36.0_2017-11-14_DSD512

Last edited by pentajazz; 12th July 2018 at 07:16 PM.
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Old 12th July 2018, 08:18 PM   #1888
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by Markw4 View Post
Right, the usual considerations for high performance, fast parts: minimize input noise pickup, and use proper bypassing, ground plane, and ideally power plane(s) too.

And a PI filter for Mhz noise.. (+ all of the above)
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Old 12th July 2018, 08:34 PM   #1889
babolcs is offline babolcs  Hungary
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Quote:
Originally Posted by pentajazz View Post
About the su5 first impressions, on a not so revealing system, it is an upgrade from a lower spec and price dac. At first .. not excited but not disappointed either, so not an exceptional for the price dac, but not bad either. Previously Markw4 compared it with Benchmark reference DAC , and found this to have some kind of "distortion" (joke?)...


Basically I do not have Benchmark DAC, but at some stages of the modifications I also heard this distorsion. (Possibly it still exists, but at the end on a minimum level)
you can check my post (1577 & 1306) where I summarize the mods.
I think the I/V Stage + applying everywhere LME47920 OPAs decreased the distorsion.


Sz.
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Old 12th July 2018, 08:39 PM   #1890
babolcs is offline babolcs  Hungary
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Join Date: Dec 2011
Quote:
Originally Posted by Ian Greenhalgh View Post
I see some people have changed the on-board NE5532 for a LME49720, how have you found this upgrade now you've have time to listen to it - worthwhile?

Has anyone replaced the NE5532 with a discrete solution? If so, how are you finding it?

What about the LME49860, has anyone tried using one of those as I read that it is better than the LME49720.
For me as well the NE5532 replacement was a big step.
First I changed to OPA2134, and after this to LME49720.
(both changes were audiable)
As I know Janos changed to burson audio. (but not 100% sure.)
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