Has anyone tried their oap choice with & without the resistor//cap 4n7 uF feedback noise supression network and noticd a difference when listening it ?
Next up - try installing the caps and inductors recommended by Traco for EMI control to see if the weird intermod-like sounds heard in specific passages go away.
Following up just to close out the lessons learned: capacitors and inductors arrived today from Mouser, I added them to the DC/DC converters per Traco's application notes and things are quiet, with no strange noises. The real lesson is to RTFM...
Thank you, again, miro and Vunce, for all of the help!
@Paddy Garcia thank you for valuable info from which other members can gain ... we are here to help each other 🙂
Second round of modding: Singxer F-1 power supply.
I have heard a lot about the notorious 5V inside the USB cable interfering the data lines. I want to try all LPS for F-1 for both dirty side and clean side.
I did the 5V on the clean side first. Simply removed the boxy DC-DC converter and then gave it a low noise Lt3045 reg @ 5V.
The improvement is obvious! I am pleased and listened to it for two days.
Then for the dirty side 5V input, I removed the big inductor beside the USB port to cut off the USB 5V.
Then supplied it with 5V from Lt3045 reg.
This time the improvement is enormous!
Surprised that I never thought the dirty side was important to have a nice clean power.
The bass is back! I don’t need passive bass boost anymore!
Details, details and details for bass mid and treble.
It is unbelievable.
I also replaced the SMD cap with a low esr 10,000uF cap on the clean side.
I am happy with this little modding.
I have heard a lot about the notorious 5V inside the USB cable interfering the data lines. I want to try all LPS for F-1 for both dirty side and clean side.
I did the 5V on the clean side first. Simply removed the boxy DC-DC converter and then gave it a low noise Lt3045 reg @ 5V.
The improvement is obvious! I am pleased and listened to it for two days.
Then for the dirty side 5V input, I removed the big inductor beside the USB port to cut off the USB 5V.
Then supplied it with 5V from Lt3045 reg.
This time the improvement is enormous!
Surprised that I never thought the dirty side was important to have a nice clean power.
The bass is back! I don’t need passive bass boost anymore!
Details, details and details for bass mid and treble.
It is unbelievable.
I also replaced the SMD cap with a low esr 10,000uF cap on the clean side.
I am happy with this little modding.
Attachments
Second round of modding: Singxer F-1 power supply......
......I am happy with this little modding.
Excellent results from exploratory F-1 surgery Nano35 😉
I will look at my Singxer C-1 and see if that mod is an option.

Here is a diagram showing the Singxer F1 solution.
I updated in a relevant thread "Powering Singxer F1".
I just pulled out the Amanero384 board from my Dam1021 Dac and did the similar modding.
The outcome is again surprising good! There was a layer of "noise" before; now it is gone. I also attached a diagram indicating the modding for Amanero384.
By comparison, both are excellent USB-I2s interface boards with SQ being a bit different. I guess the clocks are different and no isolation for Amanero384.
I updated in a relevant thread "Powering Singxer F1".
I just pulled out the Amanero384 board from my Dam1021 Dac and did the similar modding.
The outcome is again surprising good! There was a layer of "noise" before; now it is gone. I also attached a diagram indicating the modding for Amanero384.
By comparison, both are excellent USB-I2s interface boards with SQ being a bit different. I guess the clocks are different and no isolation for Amanero384.
Attachments
Hey, hey... 😀
whatever isolation and Fifo... whatever the designers claim : the source still can be heard, I ill not focus to much on isolators, fifo... many things can be done and corrected by working on power supply and decoupling towards the ground -again whatever the fifos, isolators after 🙄 !
whatever isolation and Fifo... whatever the designers claim : the source still can be heard, I ill not focus to much on isolators, fifo... many things can be done and corrected by working on power supply and decoupling towards the ground -again whatever the fifos, isolators after 🙄 !
Hello Nano, many thanks for sharing 🙂Here is a diagram showing the Singxer F1 solution.
I updated in a relevant thread "Powering Singxer F1".
I just pulled out the Amanero384 board from my Dam1021 Dac and did the similar modding.
The outcome is again surprising good! There was a layer of "noise" before; now it is gone. I also attached a diagram indicating the modding for Amanero384.
By comparison, both are excellent USB-I2s interface boards with SQ being a bit different. I guess the clocks are different and no isolation for Amanero384.
Have you tested both boards against jlsounds i2soverusb?
Pistollero,
Too bad I don’t have JLsounds board.
It seems like a reasonable priced board against the other 2.
Too bad I don’t have JLsounds board.
It seems like a reasonable priced board against the other 2.
In the future i will try to test them.[emoji106][emoji106][emoji846]Pistollero,
Too bad I don’t have JLsounds board.
It seems like a reasonable priced board against the other 2.
I ordered this board to my project. XMOS XU208 Asynchronous USB Digital Interface Coaxial DSDOP IIS Output DSD128 | eBay.
Dunno how good it is
Dunno how good it is

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