Would it make sense to mate a Duet rcvr w external I2S DAC?

[Ryssen]

Been reading through this thread,and it doesn´t say where to take the signal to S/PDIF.I have tenlabs clock with S/PDIF out but where do I take the signal from Xilinx?

[jkeny]

Hey, guys,
I haven't done anything with my Duet since I last posted here - just no time but I was reminded of this thread & Hybride's report about his reduction in the hard edge to the sound when using a router. What reminded me was this discussion on DIYaudio about RF noise & distortion in audio. In fact most transformers would not be a barrier to RF & this strikes me as the most likely explanation for Hybride's results - very interesting. Solution is to put a RF blocking choke on the ground link or disconnect the ground (if this is possible?).

Anyway, anybody done anything further with mods? Anybody else try transformer on analogue output of DAC?

Edit: link left out http://www.diyaudio.com/forums/every...-rf-audio.html

[Ryssen]

Waking up an old thread,as I understand it the 3,3v is important for the sound,but what is the 1,2v for?It would be a waste to change it,if it makes no different on the sound.
Anyone knows?

[jkeny]

Ryssen,
I'll try answering your two questions:
- The Tentlabs is a clock - it puts out a clock signal not a SPDIF signal
- The 1.2V (if I remember correctly) is only to power the core of the Xilinx chip & not involved directly in the sonics but who knows, it might effect it?

[Ryssen]

Thanks for the answer!
On my tentlabs clock there is a s/pdif input and a new (better?)output.
Now I found out where to connect it anyway.

[fvale]

I recently connected as described a SBR directly to a vintage TDA1541 dac and it worked perfectly. Disabling the 12MHz oscillator I was almost sure I coundn't use radio anymore as I thought it used 48KHz sampling frequencies..... but it still plays! Can someone confirm radio works at 44.1 as CDs?

Ok, first you have to open the magic box. Remove the 'sticker' on the bottom. Then you see the 4 little bolts. Then, the way to go for optimum I2S:

Connect (R17=MCK), R18=BCK, R19=DATA, R20=LRCK, to any DAC with I2S input

If you want to feed separate voltages: remove the Wifi board. On the main print you will see 2 regulators, both with a coil on the output. Remove the coils and inject 3.3 and 1.2 Volts if you like. The SBR will work on I2S and wired ethernet with only these 2 voltages!

Remove the 11.289 crystal and R104. Inject the new clock to pin 42 of the Xilinx or on the side of R104 which is connected to pin 42. Unsolder/disconnect pin 14 (vcc) from the 74HC04. With that you disable the 12mhz crystal and SPDIF. Pin 14 is the upper right pin when you have the SBR in normal position (led in front).

Tried to lower the voltage of the clock to 1.6V. It's really nice!

[JIJ3]

Some stations are 44.1 and others are 48. You will find some that you can't play, but most of the ones I am interested in are at 44.1