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Old 8th April 2014, 01:37 PM   #501
Flac is offline Flac  Netherlands
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... can not tell, since I've got only the ESSTECH recommended AD797, so I don't know about the diff towards the LMEs ... maybe worth a try ...

... sometimes I had the locking issue as well ... could be that my settings in Voodoo2000 were somewhat off ... played with the settings and found it to be cumbersome on the long run, so I changed to JRiver.

After using the windows one, it played quite nice, switch to OSX with JRiver as well as using JRemote on the iPad Air, that just played very nice ...

currently using the linux variant (still in beta, if not alfa) playing along very nice as well ...

since I used that setup the locking issues where kind of history give or take a few exceptions.

... sometimes I had locking issue in the middle of a song, or at the beginning, stopping the song and start it again mostly solved it. This is most happening with switching to DSD or from DSD.

What might be a cause can be, but must not be, a bandwidth issue if using wifi instead of cabled LAN. At least that's what happened sometimes as well. Having your house kind of full wifi users (almost a lan party going on) their might some bandwidth limitations. 3 Kids and the better half of me do take up some bandwidth if playing along ....

That all got away once using a cabled connection ... plays quite nice I must say for a beta piece of software (almost two weeks without a glitch at the moment)

BTW, does somebody have any idea/experience how the AD797 compare to an LMExxxxx theoretically and soundwise .... ???

Edit: Do you have the Amanero up to date concerning the firmware ?

Last edited by Flac; 8th April 2014 at 01:46 PM.
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Old 8th April 2014, 08:02 PM   #502
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Yes my Amanero is up to date with regards to firmware.
I have attached some key data of the Op amps we have been talking about including the AD797.
The LME49990 appears to be best for noise,thd and pssr if you believe these factors are important for IV. On the other hand if you believe it is the slew rate, settling time and output current that are important, than the AD811 seems to have the best performance.
For this reason, I tried both the LME49990 and the AD811. To be fair, I found the tonality of the two to be radically different. The LME49990 sounds very clean and dynamic whilst the AD811 sounds a bit bassier but does not have the clarity and preciseness of the LME49990.
To make the AD811 stable you have to use a 1k resistor in series with its negative input. I am unsure as to whether this impedance is changing the mode of operation of the ES9018 from current to voltage mode and hence degrading the overall performance? A view from the experts would be very welcome.
Please post your own experiences with Opamps to see whether we can correlate this with the technical data.
Edit just spotted an error in the spreadsheet. All the noise figures are in nV/sqrHz including the LME's but the spreadsheet says V/sqHz for these.
Attached Files
File Type: pdf IV Opamp Comparision.pdf (9.4 KB, 66 views)

Last edited by themystical; 8th April 2014 at 08:06 PM.
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Old 8th April 2014, 10:02 PM   #503
farhun is offline farhun  United States
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I have used LME49990 (L49990MA on adaptor board) for a long time before switching to 49713HA. They were my favorite as well, the sound signatures are very close. To me LME49713 is more fuller with equal transparency, perhaps due to its higher drive capability. I had excessive heat buid up, killing some of the chips in a given time. I ended up with buying a big quantity from Mouser, adapter boards and pins to make it cheaper and keep up with the losses! ( later I used 600 ohm resistors to reduce the oscillation with some level of success ). LME49713 handles heat and I actually got to like them more then 49990s.

FLAC --- I did try AD797 just out of curiosity ( may be just like you, reading the ESS's recommendation, I don't remember much, though) but I can tell you that I replaced them more or less after an hour of testing, with 49990s. If I were you I wouldn't bother.

I've tried lm49710, lm6171, OPA627, 637 .. and many others. None of them are bad chips, but they have different tonal characteristics for sure.
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Old 8th April 2014, 10:51 PM   #504
Flac is offline Flac  Netherlands
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nah, too late, I just ordered a couple of lme49990s

just to hear if there's difference ....

I've got a real crispy clean sound through my AD797s, maybe a bit too clinical but that could be caused by the other parts as well.

too bad I can't let you hear it, it's a 384 kbps single track, size 600+ MB, maybe upsampled though .... ?

If I close my eyes and just listen to the voice I almost think she sings just in front of me ... at the moment it's my reference ...

Don't think I could get it uploaded or

... well, actually you could try and load it from here in the 384 DXD version ...

http://designwsound.com/dwsblog/reco...i-res-samples/

Last edited by Flac; 8th April 2014 at 10:57 PM. Reason: Adding a link
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Old 10th April 2014, 12:43 PM   #505
Neville is offline Neville  United States
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I looked for this pcb on ebay under Diyinhk and could not find it being sold. Haave they ceased production of this? If so what is the next hottest diy dac?

Thx
Neville
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Old 10th April 2014, 12:47 PM   #506
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ES9018 32bit Audio DAC PCB kit - DIYINHK
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Old 10th April 2014, 01:01 PM   #507
Neville is offline Neville  United States
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Aha ! So that is where the little bugger is Thanks Rod.
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Old 14th April 2014, 01:45 PM   #508
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Quote:
Originally Posted by abraxalito View Post
For pure CFB amps like LME49713 there are other tricks you can play which are outlined in this appnote from TI : http://www.ti.com/lit/an/slyt099/slyt099.pdf

Using the ferrite bead in series with the -ve input isn't something I've tried myself, but I sure plan to
For those using CFB, this post and article goes a long way towards explaining my subjective listening experiences with AD811 CFB Opamp. Previously using a 1k resistor to stabilise the opamp, I think it was a double whammy of the increased noise levels due the resistor and possible the resistance forcing the Sabre chip to operate in "voltage" mode.
I liked the idea in the article of using an inductor of which I had some 1uH ones in my part box. This would give an impedance of 628 Ohms at 100MHz. I tried this in the circuit but the impedance was too low and the op amp was unstable. I guess this circuit would need an impedance of around 1k at 10MHz to be on the safe side so possibly an inductance of around 16uH would do the job?
I the tried some AG grade Murata Ferrite beads with an impedance of 600 Ohms at 100MHz which I had in my parts box. These worked and the Op amp is stable. These are a big improvement on the 1k resistor in subjective SQ terms. For the first time using this opamp, I felt I was hearing the benefits of the high output current, the massive slew rate and extremely fast settling time. The presentation to my ears is "weightier" than the LME49990 and the bass response/dynamics are in a different league.
I need to listen for an extended period to make up my mind as to which presentation I prefer but if you are already using a CFB opamp, the ferrite bead is a big improvement over a stabilisation resistor in this application.
Thanks Abraxalito for posting that article.

Last edited by themystical; 14th April 2014 at 01:48 PM.
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Old 16th May 2014, 10:57 PM   #509
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I have experimented with the LME49713 CFB opamp. Unfortunately, this is not stable with a Murata AG grade 600 ohm Ferrite Bead. It appears to be stable with a 680 Ohm resistor but because of the issues stated in the TI article on the above post I am going to try a HG grade ferrite with a higher impedance.
I have also tried overclocking the chip with a 125Mhz SAW Epson clock as strongly recommended by a couple of people in other threads. Funnily enough, there is no crackling with the single ended output but a lot when I use the balanced output (through the evaluation board recommended LPF circuit). I can only assume that overclocking increases noise breakthrough so not recommended and possibly the recommended passive LPF filter in the balanced mode is not as aggressive as the single ended Op amp based one.
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Old 18th May 2014, 06:58 PM   #510
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It would appear as if the LME49713 is stable with a Murata HG grade bead. The ones that I used were BLM1BHG102SN1D. I have only done 1 channel so can't compare SQ against the AD811.
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