Hola,
@PochoLaPantera!
Sorry for my english is basic.
Firstly, please don't worry about your English, significant number of people on this thread are not native English speakers (including myself), and we are hear to help each other in pursuit of elusive HiFi sound, so as long as we can understand and relate to each other language is not an issue.
What mod do you recommend and where can I buy what I need?
I can't go testing since I don't have much money.
Fair enough, there are few significant improvements one can do on a budget, but some of them while cheap require skills/tools that you may not have, either find someone who can do it for you for free or for small fee.
#1. Learn how to open your DSD without damaging it. It's VERY important as few people here and elsewhere damaged screens on day 1, ouch!
After undoing screws and removing side plates I push (gently!) from USB port side and then help the board slide out grabbing it by its sides when it slides out.
Pushing it back in should NOT be done with any force, insure that top digital board (the one with LCD screen) slides into dedicated slots before pushing it back in, I also filed/shaved a bit of aluminium inside of the casing on the top side edge opposite from LCD screen so that the battery is not damaged in the process, it helps a lot.
Watch LCD screen when the boards are out, it's very fragile!
#2. Replace LM4562 with genuine part, I believe arrow.com delivers to many countries (and the delivery is free!), can you check from your side?
https://www.arrow.com/en/products/lm4562nanopb/texas-instruments
#3. This and following step will require hot air soldering station and skills, I do not recommend buying one unless you plan to do "no stone left unturned" type of mods (like myself and some others here), but it's expensive for one-off mod. I heard some people had luck with local electronics/mobile phones repair stores (those guys who hack XBOXes and PSs are good too), give it a go.
You need to buy this lot:
https://www.aliexpress.com/item/10P...MFX-LP5907-LLVB-IC-REG-LDO-3/32843589082.html
and replace ALL LDO's on the digital board (x5) and 1 one the bottom of analog/DAC board, labelled DE=A1D
You will also need to buy this:
https://www.arrow.com/en/products/tps73250dbvt/texas-instruments
And replace 1 LDO labelled 48MD (can someone please confirm it's correct label in stock DSD?) on the analog/DAC board. I don't have ability to post photos now, but will do it when (and if) you get parts.
#4. Replace two oscillators on digital board with these, insuring correct frequency is followed as printed on stock parts:
https://www.arrow.com/en/products/dsc1001di2-045.1584/microchip-technology
https://www.arrow.com/en/products/dsc1001di2-049.1520/microchip-technology
They are a bit smaller in size but experienced person with hot air station should not have any difficulties.
All in all I think it's less than $10 in parts + labour but these mods should improve your DSD's sound considerably.
#5. Replace LPF opamps. This one is tricky as there's too many options (from cheap to VERY expensive) and this will require desoldering/soldering in 4 capacitors that are placed on top of LPF opamps in addition to the opamps themsleves. I would try reseacrhing what people say about these: AD823, AD8599, OP275 (genuine/original) AD8620, OPA1688 and check what is within your budget too. I'm sure some other forum members will add their recommendations as well. Or do what I did and remove LPF circuit altogether, no need to buy expensive opamps, problem solved!
#6. Audio decoupling capacitors. This is usually step #2 (after changing DIP8 opamp), but removed them from my DSD and other Zishans too, so other forum members are better placed to recommend replacements.
@ThanosD and
@Merlin-PT recommend these and FM series are well-regarded as decoupling capacitors in audiophile circles:
https://www.arrow.com/en/products/eeu-fm1a221/panasonic
Hope it helps and most importantly, enjoy the journey!
PS: I would NOT recommend taking things any further until you have basic stuff done, especially if you don't have much experience as damaging your DSD beyond repair is a real danger (I did it couple of times but fortunately managed to fix the damage). But unless you are prepared to accept total loss beyond repair EVERY TIME you attempt anything more advanced, DON'T DO IT!
