I think it's a UAPP issue, neutron recognizes zishan is 16/48, windows recognizes it is 16/48, the only way is that zishan reports that or even if it's not reported they fallback to the default. We can test if zishan reports it or not, but I don't use this in USB dac.
Also, UAPP should only load it's proprietary driver when UAPP is in use, if it can't recognize the DAC, let android and all other software use it. When I connect any usb DAC to my android, neutron ask permission to use USB audio. I see UAPP also does this, nice.
Also, UAPP should have an alternative to the automatic detection and let you manual select the sample rates you want to use and resample only what is not selected. I never used UAPP and have nothing against it, just saying what I expect from this kind of software.
Eagled eyed people pointed out to me that there may be an issue with comp pin (#7) on LT1946, but it definitely works, so don’t try it at home
Small guy is yet another step-up DC-DC convertor, MT3608 I believe, did not have a chance to research it further I’m afraid.
As to the opamps voltage, easily done, as long as all caps are 16V (in mine they are not), but what do you thing the benefit would be?
If possible, I would like to use better step-up DC-DC convertors in both places, I'll try to take some time to look at the datasheets and see if I can spot anything.
I also see the AK datasheet uses polarized capacitors around the DAC and we have ceramic, wouldn't it be better to follow the datasheet recommendation?
I also wanted to look at some other capacitors in zishan and try to see if it's important to have better specs in some places.
Regarding the opamp voltage, I'm using 300, 400 and 600 ohm earbuds and want to try it, just to see if I hear any difference.
I also have read this when I was looking at op275 datasheet:
(maybe something like this also happens to other opamps that have lower output current, using lower 300, 400 loads at lower supply voltages or with other conditions ?):
