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The Zishan dsd's corner
Mar 4, 2019 at 9:50 AM Post #2,041 of 3,711
Had a free day, so i looked around and remembered i had some 2 and 3 mm acrylic, so i removed the metal sides and carefully used the rework station to heat it up and mold it around
IMG_20190304_105710.jpgIMG_20190304_163841.jpg

Also wanted to say after mods (change out ldos, opamps and caps) the equalizer still doesn't allow to boost much but it no longer distorts when i turn down unwanted freq so i can "boost" when i want overall much cleaner and better seperation seems a bit more spacious . Thanks ivan tt for all the help!
 
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Mar 4, 2019 at 10:15 AM Post #2,042 of 3,711
Ivan TT said:
Arrived, soldered in.

I do believe it offers improvement in dynamics (especially in low end) and soundstage, more vivid sound over the stock VREF LDO.
Given its price and relative ease of replacement (probably could be done using only thin soldering iron, but hot air station makes it a breeze, pun intended! :L3000: ) I'd say its as an essential mod as changing those LPF opamps (or removing them completely). Not sure about extra capacitors on VREF though, I used to have about 1000uF, currently "only" about 220uF but have 2 1000uF electrolytic caps that should fit...

So TPS73250 rocks indeed! :L3000:

Next project is separating TVDD and AVDD, already done by one member here by the way.

For the reference: VREF TVDD and AVDD meaning could be easily found in AK4497EQ datasheet, I'm just showing off my knowledge of cool mysterious abbreviations :floatsmile:
Click to expand...

Nice! Could you show a pic of how the TPS73250 mod ended up in fact...?
 
Mar 4, 2019 at 10:18 AM Post #2,043 of 3,711
Yea ivan tt, show us some pics of that dirty girl!
 
Mar 4, 2019 at 4:30 PM Post #2,046 of 3,711
The mod to separate TVDD and AVDD 3.3V power (adding another LDO) is from ArtemyR here:
http://player.ru/showthread.php?t=180748&page=344&p=2736543#post2736543

I'm only posting the photos because was asked, I'm not suggesting others should do this or any other mod.
Care must be taken not to destroy the player, also some modifications give better sound, others worst sound and some no difference.

I have cut the bottom PCB track to separate DAC pin64 TVDD and pin59 AVDD.
Added another 3.3V LDO with the output pin sticking out in the air to give a new 3.3V line.
Connected that new 3.3V line with the orange wire to a small cap pad that was already connected to pin59 of the DAC.
Except the output pin, the rest of the new LDO pins are soldered on top of the other 3.3V LDO that was already in the board.
Also added a 10uF cap between the new 3.3V output pin and ground.
I liked this mod from ArtemyR, it's one small step closer to the AK datasheet recommendation.

Here are the photos of what I did to my player:
LDO#1.jpg

LDO#4.jpg

LDO#3.jpg
 
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Mar 4, 2019 at 11:22 PM Post #2,049 of 3,711
Merlin-PT said:
That was a close call, asking for "dirty pics" just before the thread was moderated. :)
Click to expand...
Yea, he thought i actually wanted some naughty pics, i was only talking about his zishans board :wink:
 
Mar 4, 2019 at 11:50 PM Post #2,052 of 3,711
Mar 5, 2019 at 5:14 AM Post #2,053 of 3,711
Merlin-PT said:
The mod to separate TVDD and AVDD 3.3V power (adding another LDO) is from ArtemyR here:
http://player.ru/showthread.php?t=180748&page=344&p=2736543#post2736543

I'm only posting the photos because was asked, I'm not suggesting others should do this or any other mod.
Care must be taken not to destroy the player, also some modifications give better sound, others worst sound and some no difference.

I have cut the bottom PCB track to separate DAC pin64 TVDD and pin59 AVDD.
Added another 3.3V LDO with the output pin sticking out in the air to give a new 3.3V line.
Connected that new 3.3V line with the orange wire to a small cap pad that was already connected to pin59 of the DAC.
Except the output pin, the rest of the new LDO pins are soldered on top of the other 3.3V LDO that was already in the board.
Also added a 10uF cap between the new 3.3V output pin and ground.
I liked this mod from ArtemyR, it's one small step closer to the AK datasheet recommendation.

Here are the photos of what I did to my player:




Click to expand...
Well, actually I was asking about the TPS73250 mod...
 
Mar 5, 2019 at 5:23 AM Post #2,054 of 3,711
kookaudio said:
Well, actually I was asking about the TPS73250 mod...
Click to expand...
TPS73250 mod is rather simple and ideally done along with LP5907 mod.

LP5907 replaces 5-pin sot-23 LDO at the right hand side of analog PCB below, improving DAC's 3.3V power supply.

TPS73250 replaces 5-pin sot-23 LDO slightly lower to the left of LP5907, improving DAC's 5V power supply.

These could be sourced from arrow.com provided it delivers to your country.

Hope it helps.

Zishan_DSD_22_R.jpg
 
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Mar 5, 2019 at 5:37 AM Post #2,055 of 3,711
If anyone in ukraine needs those 2 parts i have 7 of the 5 volt and 16 of the 3.3 volt

Can sell them at the price i paid, pm me.
They seem to clean up the sound
 
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