[raabje]

Probably the problem is in the card reader. I had it more like it, I soldered contacts

For firmware - write to the seller, they can find the firmware without any problems

Thanks, I have contacted NiceHCK and they will try to get firmware 0.5d from Zishan.

When the player is working again, and the stuck song problem is still there I will check the cardreader and other soldered connections.

 

[londere]

1) working time and heating. 680 ohm - 2k - the less, the more heating
2) no, this is not a filter, this is for powering the amplifier. The bigger, the better

1. Thanks for your kind reply
2.- I had 2x222uf elna silmic they should replace the mentioned caps or in parallel to the solder ones?

 

[maxifuny]

Can I place caps same as Your DSDs sabre?

If you want to get an interesting sound, then I drew a mod.
* the picture of the player is not mine

 

[maxifuny]

they should replace the mentioned caps or in parallel to the solder ones?

parallel

 

[londere]

parallel

Results from several mods posted

 

[povidlo]

Does anyone know if 0.5d firmware version is applicable to DSDs AK4499 version?

I have 0.5c installed on mine.

 

[maxifuny]

Results from several mods posted

The 275 has pretty poor bass control. I would replace it with something faster. AD8620 or ADA4898-2

 

[Setmagic]

@maxifuny
Thank You so much for this scheme!
This Wima is ok for audio?
WIMA Red 5% 63V 100-330nF


I see this is nF not uF on your scheme
Can I place electrolytic polarised caps in parallel to this ceramic (unipolar)?
For example 470uF 10V ELNA or 100uF 16V Nichicon?

@edit
Safe placement without overburning looks like that:

 

[londere]

The 275 has pretty poor bass control. I would replace it with something faster. AD8620 or ADA4898-2

In a nerby future I will change it I was looking that options or opa1642,1662 or do mods like posted by @slavalun or make a based one shanling m8 crappy/cheap similar config (from DAC--->I/V--->LPC--->GAIN)

 

[maxifuny]

I see this is nF not uF on your scheme
Can I place electrolytic polarised caps in parallel to this ceramic (unipolar)?
For example 470nF 10V ELNA or 100nF 16V Nichicon?

is it possible to use Wima? - Yes.
Is Wima capacity correct? - Not! It is important

470uF 10V ELNA or 100uF 16V Nichicon - for example. Not "nF" !

 

[maxifuny]

Safe placement without overburning looks like that

more resistors at the output.

 

[SnooDucksAudio]

The 275 has pretty poor bass control. I would replace it with something faster. AD8620 or ADA4898-2

I've got I/V ad8620 and opa1622 as LPF. I got rid of muses. Haha muses too noisy

 

[SnooDucksAudio]

I think I need to get custom metal case, to fit bigger battery for ak4499, eats so much power, and more caps space

 

[Setmagic]

is it possible to use Wima? - Yes.
Is Wima capacity correct? - Not! It is important

470uF 10V ELNA or 100uF 16V Nichicon - for example. Not "nF" !

Ofc "uF" my bad I have so many capacitors from different producers, with different digits and numbers on it right now.
I'm still learning about capacitors and correct polarisation and capacity.

more resistors at the output.

2x 3kom in your scheme instead 100om?

 

[londere]

I think I need to get custom metal case, to fit bigger battery for ak4499, eats so much power, and more caps space

I see acrylic cases made in Philippines, cost USD 20-30 can quote here

I've got I/V ad8620 and opa1622 as LPF. I got rid of muses. Haha muses too noisy

could you post an image of your board?