[gruvytune]

wow unbelievable!!!. since my lks004 is a very special verion (upgraded usb board without power suppply). the usb board draws power from the port. that means i can use whatever power supply i like. and that's it. using it to power micro iusb3.0. the results are astonishing!!!

Hi! Can you show an illustration of how you wire and hook all that up and what setting you use? Thank you!

 

[littlexx26]

Hi! Can you show an illustration of how you wire and hook all that up and what setting you use? Thank you!

notebook - ipurifier3 - micro iusb3.0 powered by lps-1.2 - igalvanic - ipurifer 3 - dac

 

[b0bb]

Could you share the photos of your modded LKS 004?

Current snapshot of my 004
1)OCXO between the DAC chips
2)Rebuilt enhanced USB + LT3042 on top right corner
3)Thermal coupling of discrete opamp output transistor pairs
4)3M AB5100 RF absorber on I2S HDMI input shield and misc chips
5)I2S HDMI shell insulated from metal chassis
6)USB metal shield insulated from chassis
7)Twist all AC wiring into board.

Ad 4. Do you mean a board like this?
https://www.ebay.com/itm/LT3045-LM-...h=item3ae4e2bfa0:g:1fcAAOSwXYtYyCH-:rk:4:pf:0
How many is needed? For sure one for the i2s/spdif section.

Up to 3.

The one you pointed to should have a 1A regulator like the TPS 7A47.

The current consumption of the load on regulators should be measured to be absolutely sure if the replacement unit output is less than 1A. LT3045 units supply up to 500mA and will need an external transistor to boost current output.

You will have to measure the height of the mounting hole on the heatsink to make sure the board fits.

Ad 5. Which one is the Vcom bypass capacitor?

The really big axial cap above the red WIMA box cap above one of your arrows

Ad 6. Please take a look at the enclosed file, have I marked it right?

Those are the right caps for replacement

 

[b0bb]

Can someone explain this? Happens every time I try to play native DSD. Source is Roon, same thing when using Jriver and other DSD albums. No problems with DoP or PCM at all, though.

Spoiler

Sounds like the DAC is intermittently losing lock on the DSD bitstream
Increase the DPLL bandwidth to 15

 

[b0bb]

b0bb,

The LT3042 PSU just arrived. I'm going to run it a while as is to make sure its OK.

1000uF is the highest value in the 16V SEPF catagory that you recommended for the LT3042 PSU mod. Which 2200uF cap did you have in mind?

Thanks.

https://www.mouser.com/ProductDetai...R1wrj203KOFZec2tglEEbLmKxGadzG7snrKmWLyhApA==

OSCON SEPF had the biggest value at that time

 

[b0bb]

b0bb,

Do you happen to know which of the i2S HDMI output modules that are compatible with the Kali Reclocker is the best match for the LKS 004?

https://www.audiophonics.fr/en/diy-...dule-hdmi-i2s-lvds-to-i2s-output-p-12422.html

Contact Allo to check if the one above will work.

 

[Whitigir]

@b0bb what are those big caps ? May I know

 

[rettib2001]

https://www.audiophonics.fr/en/diy-...dule-hdmi-i2s-lvds-to-i2s-output-p-12422.html

Contact Allo to check if the one above will work.

Thanks,

Funnily enough I sent them an email about it yesterday!

I'll wait to hear back from them.

 

[b0bb]

@b0bb what are those big caps ? May I know

Bypass for the DAC common mode reference voltage.

This affects the bass extension of the DAC or lack of, one of the complaints about the 004

 

[piaseczek]

Current snapshot of my 004
1)OCXO between the DAC chips
2)Rebuilt enhanced USB + LT3042 on top right corner
3)Thermal coupling of discrete opamp output transistor pairs
4)3M AB5100 RF absorber on I2S HDMI input shield and misc chips
5)I2S HDMI shell insulated from metal chassis
6)USB metal shield insulated from chassis
7)Twist all AC wiring into board.





Up to 3.

The one you pointed to should have a 1A regulator like the TPS 7A47.

The current consumption of the load on regulators should be measured to be absolutely sure if the replacement unit output is less than 1A. LT3045 units supply up to 500mA and will need an external transistor to boost current output.

You will have to measure the height of the mounting hole on the heatsink to make sure the board fits.



The really big axial cap above the red WIMA box cap above one of your arrows



Those are the right caps for replacement

Thanks for explanations b0bb.

Are you going to add an additional transformer for the Amanero's power supply?

Next to three LM317s I've noticed the low noise LT1963A and the same ultra low noise regulator as near the DACs (TI 7A47?), could you tell me what they are for?

 

[Lennym]

@b0bb what are those big caps ? May I know

Bypass for the DAC common mode reference voltage.

This affects the bass extension of the DAC or lack of, one of the complaints about the 004

Which caps are these?

 

[b0bb]

Which caps are these?

Look at the pictures @piaseczek posted, the one with the white arrows.
Bypass Cap is just above the red WIMA.

 

[b0bb]

Thanks for explanations b0bb.

Are you going to add an additional transformer for the Amanero's power supply?

Yes, probably a split bobbin conventional EI type transformer, this has the best isolation between the primary secondary windings. This prevents the RF noise on the secondary side from going back into the primary windings.

Next to three LM317s I've noticed the low noise LT1963A and the same ultra low noise regulator as near the DACs (TI 7A47?), could you tell me what they are for?

LT1963A is the primary regulator for the 9038s

 

[piaseczek]

b0bb,
please take a look at the attached photo, do you know what the low noise power regulator near the LM317s is for? It's the same type as near the DACs.

If I replace the stock LM317 to the TPS7A47, like the one below:
https://www.ebay.com/itm/TPS7A4700-...h=item3ada614525:g:7UMAAOSwhlZYtc1E:rk:8:pf:0
will I get a sound improvement on the SPDiF, BNC, i2s, USB input? Or maybe without USB?

I can't understand why the LKS team used the old and noisy LM317 in this section... even in the LKS 003 there was the better version, the LT317.

 

[piaseczek]

b0bb,
Do I assume correctly that the AMS1117 3.3v is to power a clean side of the ISO7640?