GUSTARD DAC-X10 DAC ES901 (Support DSD) - Page 2 - diyAudio
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Old 15th June 2014, 02:10 PM   #11
bogino is offline bogino  Slovakia
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Please note the difference on Thoms pictures and mine. I thought only one version exists ... )
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Old 17th June 2014, 04:05 PM   #12
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Bogino, the difference is just that I modified my DAC with output transformers, otherwise they are probably identical
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Old 17th June 2014, 04:37 PM   #13
bogino is offline bogino  Slovakia
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Thom, thanks for your explanation! I was curious to see your picture.
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Old 25th October 2014, 08:55 PM   #14
namcir is offline namcir  Philippines
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any other possible mods to this dac? like rotary encoder or pot for the volume controls? it said the outputs are discrete, but what are those opamps doing there?
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Old 26th October 2014, 08:08 AM   #15
ondesx is offline ondesx  France
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Hi all !

Someone knows if there is a great difference between this GUSTARD 9018 SABRE DAC-X and the "new" DirectStream DAC from PS Audio ?

Thanks for any info...
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Old 26th October 2014, 07:26 PM   #16
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I am very satisfied with the sound... and i really don*t know if i will modified it. Although i mod all i have at home i will think twice with modding. First thing that i will don is doing sepparate 5V usb supply because it is feeding from source, PC. I have made sepparate supply
diy silver cable with 4 batteries supply. Sound is more analogue, fuller, very good.
How many opamps is on the analog signal path? just opa1642 or TL072?
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Old 30th October 2014, 04:01 PM   #17
bogino is offline bogino  Slovakia
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Nice. I am using this one: STONTRONICS - S2226ST - AC-DC LINEAR PSU, 5V 1A UNIVERSAL | eBay
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Old 31st October 2014, 08:33 PM   #18
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How do you describe difference in sound?
I have opened the dac. Try to measure and see how it is implemented.
Must say it is well done for that money.
But i have done some mods....Why?
Sound from usb with adaptor and connected with power to linux player is very different...much more than comparing es9023 powered from adaptor or player.
Gustard x-10 sound much more refine analogue sounded, neutral, when powered from batteries as powered from pc.
I take a look inside the dac. Xmos is feeded from internall 5v ams3117 preregulator followed adp151 regulators. Only USB3118 transceiver is powered from externall usb 5v. It can be redesigned that is powered from dac but some mods must be done...left one diode out and connect one resistor.
But then the magic of using output supply is out. USB3118 has no regulator so the sound difference can be expected. I also replaced rca for coax input to neutrik 75ohm BNC input because i have bnc cables for spdif.
Some mesurement was done. 1 Preregulator oscillated heavy.. the most problematic is regulator U5 GAL RPH i am not sure if it is analog devices. Decoupling solve 95% of ripple, but 10uf ceramics on ams3117 100% defeat ripple but sound becomes harsh, bright ,artiffical, with one for my ears unpleasant musical note that is present all the time at listening... neutrality is gone... simmila as it is powered from external pc (normal usb connection)... I think that ams3117 don*t like ceramics on output.
Measuring all other supplies were clean. I replaced 3 tantals after adp151...for smd panasonic sp cap.
The FINAL question... ADA797 AVCC regulator is, or it is not the best choice-sollution? I tried 100Uf Silmic 2 at output and sound become to hard, I replaced it with 10uf SAL-RPM as Black gate replacement and its ok. A little more sub bass energy and highs have a little more microdetails. Fine.
So members ... any idea or experimenting with ad797.
Have any sense replacing AD797ar with AD797br?
Any sense putting 50pf between pins 6 and 8.
Any sense putting transistor on output?
From datasheet power consumption is about 60mA for AVCCL and AVCCR when clock is 100mhz. And AD797 maximal output is 50mA. When i tuch it is warm, not extremely hot. Voltage is about 3,36V so everything seems good.
I have not finished with mesurements and mods because i have no time today. Next week i will go further.
菜鸟,AVCC +3.3V可否用2个AD797供电? - Powered by Discuz!
【Prometheus 9018公测版体验制作】*即将巡回演出(9.10更新) - Powered by Discuz!
Hear it in the one drop
Till that time all your ideas are welcome.
Thank you
Attached Images
File Type: jpg ad797.jpg (110.0 KB, 248 views)
File Type: jpg es9018.jpg (163.8 KB, 248 views)
File Type: jpg xmos reg.jpg (140.7 KB, 243 views)
File Type: jpg regulators.jpg (165.9 KB, 240 views)
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Old 31st October 2014, 10:57 PM   #19
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Maximum output current of AD797 is exceeded. Maybe they're not original AD797 ?

You could try niobium SMD caps for the U5 GAL RPH reg if you don't like ceramic caps.
It's only audio. Member of the non modular PCB design committee

Last edited by jean-paul; 31st October 2014 at 11:01 PM.
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Old 1st November 2014, 09:22 AM   #20
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Thank you jean-paul.
I will try some caps.
Know anybody some Russian language...they say something about modification of X-10.
掷 GUSTARD DAC-X10 DAC ES9018 - 羊疣龛鲟 9
Have you found some other sites?
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