Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter

[MisterRogers]

Any updates? Hoping you're able to get it sorted out.

Originally Posted by mcluxun

Thank you Ian
For future inference, my solder was on 610 f.
I will try to fix it tmr.
Cheers
Liang

[iancanada]

Originally Posted by nvduybom

Hi Ian,

Can I change the default input with SPDIF board? .

Regards,

Van Duy

You can not change it for now.

Actually the spdif selecting was controlled by the fpga hardware. I can program it having different default just like the *Fs does. The problem is there is no any jumper left on the fifo board .

I recommend using the otp as the default spdif input for a better isolation. With fifo, there is no difference between opt and cox.

Regards,

Ian

[makumba1966]

Hello,
After about 10 hours burn in and listening Si570 board, replaced TPS7A4700 with TPA v3 Trident modded to 200mA. This noticeably improved IMHO overall sound with naturality, stereo imaging, ambience and midrange quality.
I wonder if the TPS reg needs more time to get better performance, or TPA is just better in this applicartion ?

[iancanada]

Originally Posted by makumba1966

Hello,
After about 10 hours burn in and listening Si570 board, replaced TPS7A4700 with TPA v3 Trident modded to 200mA. This noticeably improved IMHO overall sound with naturality, stereo imaging, ambience and midrange quality.
I wonder if the TPS reg needs more time to get better performance, or TPA is just better in this applicartion ?

Hi makumba1966,

Good to know that. You might be the first one besides me experiencing the Si570 clock board.

Si570 clock is very sensitive to PSU. Different PSU sounds quite different in style. Even you change the capacitors. Very interesting.

I have a TPA reg, could you let me know how to mod it to 200mA? I'd like to give a try.

Have you try other power supply? Let me know if you get more discovery.

Regards,

Ian

[makumba1966]

Hi Ian
To get 200mA CCS form TPA I combined parallel R4 ( 20 Ohm ) with 12 Ohm. I have not tested other regs yet. I tried replace TPS beacuse felt that SI board souds little less natural then xo dual board with CCHD957, but i'm not shure if burn time was enugh to get serious conclusion. Fresh Trident reg does not sound good too to me. Even with TPA, it seems to me, that XO dual board had a little better timbre. But I trust your opinion as well, that Si clock is better too

[MisterRogers]

Sorry, I'm a bit confused. Did you find the modded Trident sounded better than the TPS7A4700?

[iancanada]

Originally Posted by makumba1966

Hi Ian
To get 200mA CCS form TPA I combined parallel R4 ( 20 Ohm ) with 12 Ohm. I have not tested other regs yet. I tried replace TPS beacuse felt that SI board souds little less natural then xo dual board with CCHD957, but i'm not shure if burn time was enugh to get serious conclusion. Fresh Trident reg does not sound good too to me. Even with TPA, it seems to me, that XO dual board had a little better timbre. But I trust your opinion as well, that Si clock is better too

Thanks makumba1966, I'll try the TPA as the way you did.

At the beginning, on my BIII, I listen to Si570 and dual xo half and half. But now I'm with the Si570 more than dual xo.

I use Cyclon 6V battery as DC input of Si570 clock board, together with the isolator board. My system includes B&W 804, Pass 350.5 and Pass preamp.

If you prefer midrange, you may try the attached 16V MLCCs.

Have fun.

Ian

[makumba1966]

Originally Posted by MisterRogers

Sorry, I'm a bit confused. Did you find the modded Trident sounded better than the TPS7A4700?

I got that impression , but have to do more comparisons.

[makumba1966]

I never tried battery for clock board, but using isolator board. Have dedicated PS circuits for dac, i/v, fifo and clock board , each include separate trafo + shunt PSU and EMI filters. My system includes Manley Neo Classic monos , big studio monitors based on Focal speakers and some "high end" cables.

[roender]

Originally Posted by MisterRogers

Sorry, I'm a bit confused. Did you find the modded Trident sounded better than the TPS7A4700?

This is not a surprise given the noise of trident regulator: 2.9uVrms, 100Kh bandwidth
The output impedance is almost the same as TPS7A4700 regulator.
I suppose no one imagine an integrated regulator will beat a well designed and implemented discrete regulator :-)