[b0bb]

Add resistors, diodes and caps

 

[b0bb]

Closeup of the mounted regulators

Belleson SPX17 with LT1764 on left

LT3083

 

[Xoverman]

This is the DS26LV32A I2S receiver on my DAC.
It is not LVDS, instead it runs RS-422, a slightly different protocol.

RS-422 signal levels are higher than LVDS, this might explain the slightly weird termination that LKS used to make it compatible with LVDS transmitters.

The problem I have with this chip is that it is being operated beyond its limits. It is specified to run up to 32MHz.

DSD512 is just under 50MHz, as such I2S performance is suboptimal on the 004
I replaced this a faster receiver from Sipex/MaxLinear, the SP26LV432CN is designed to operate up to 50MHz



There was an immediate improvement, like a haze was just lifted from the music, everything become clearer.
Soundstage became wider, high notes lost the vestiges of sibilance,especially percussion instruments.
Bass notes went lower without getting muddy.

I can now reliably drop the DPLL setting down to 7 with DSD512, it was not stable with the original receiver chip.
Power consumption dropped between 6-10% with this new receiver chip.

I knew you would do that.
Great job!!! Your allways faster than me. I actually had the same idea. And now I know, it's a good one.
Marry Christmas to everyone

 

[Xoverman]

I thought it might be interesting for you to see my setup.

 

[MartinWT]

I thought it might be interesting for you to see my setup.

Always interesting to see other people's setups.

I considered a big screen but decided I didn't want anything like a TV in my listening room and settled for my Android tablet as controller.

Hope you've put a choke on the TV power cable because of nasty SMPS noise back into the power circuit.

 

[Xoverman]

3 1/2 Way 24db Linkwitz Riley pasive X-over. TV is tilted down to reduce wall reflections.

 

[Xoverman]

The transformers have pre filters you can't see on the pictures. The Pioneer DVD player is mainly used as a large ground plane.

 

[Xoverman]

The digital signal path goes from the computer to the Singxer USB isolator.
From Singxer USB isolator the signal travels to the ifi usb reclocker. There it is brought to HiFi ground at the same time.
From the ifi usb reclocker it travels on to the SU-6, and receives DAC digital ground.
So there are no digital ground loops.
Everything is powered by battery.

 

[Xoverman]

merovinger 15" 1200 W servo subwoofer

 

[Xoverman]

Mains filter in the basement.
left: Subwoofer isolation transformer 2500W with screen shielding between primary and secondary side
center : Accuphase integrated amplifier isolation transformer 2500W with screen shielding between primary and secondary side.
right : DAC and 9V Power Supply primary isolation transformer 1500W with screen shielding between primary and secondary side.
All transformers are operated with 400V two-phase current. this halves the interference on the power grid, and the phase is shifted 30 degrees forwards, where there is less interference from rectifiers.

 

[Xoverman]

Secondary isolation transformer 500W with screen shielding between primary and secondary side just for the DAC .

 

[Xoverman]

Always interesting to see other people's setups.

I considered a big screen but decided I didn't want anything like a TV in my listening room and settled for my Android tablet as controller.

Hope you've put a choke on the TV power cable because of nasty SMPS noise back into the power circuit.

The big screen turned out to be an advantage in retrospect, because I can reflect the sound downwards.
The first front reflection point is directed onto the carpet by the television.
The television has a 16A Schnaffner line filter. The cable that goes to the TV is a star quad geometry shielded.
The television and the computer are supplied by the normal house electricity network. They have no connection to the HiFi power grid.

 

[oldearwax]

Don't have a lot of Watts, but the best watt is the first watt .. my home-made flea watt amps
and old speakers .. Merry Xmas !!!

 

[b0bb]

I knew you would do that.
Great job!!! Your allways faster than me. I actually had the same idea. And now I know, it's a good one.
Marry Christmas to everyone

Thanks and happy christmas
This was a proof-of-concept to see if there was a bottleneck on the I2S receiver.
Stayed with RS-422 for now.

I will likely go to LVDS to get to higher data rates.
LVDS is a better match for the majority of I2S interface boxes out there like the Singxers.

 

[b0bb]

Mains filter in the basement.
left: Subwoofer isolation transformer 2500W with screen shielding between primary and secondary side
center : Accuphase integrated amplifier isolation transformer 2500W with screen shielding between primary and secondary side.
right : DAC and 9V Power Supply primary isolation transformer 1500W with screen shielding between primary and secondary side.
All transformers are operated with 400V two-phase current. this halves the interference on the power grid, and the phase is shifted 30 degrees forwards, where there is less interference from rectifiers.

Did you get a reduction in buzzing noise from the transformers when you used a 2-phase power feed?