Soekris Dam Dac

[nige2000]

Getting part numbers wrong is like something I'd do

These type chips usually have 74 in the title

Still have Richards buffer to implement yet

[wyan]

Do not use a 373. Made a mistake :(
Need a 374. Or two 74s. But the 374 will be easier to use for this

No worries and thanks. I was getting the 374 as linked in previous posts. Cheers. :)

[randytsuch]

Looks like new firmware, and new filters are on the horizon

http://www.diyaudio.com/forums/digital- ... ost5377384

My DAC now has potato flip flops and the isolators removed. Sounds really good.

[nige2000]

Looks like new firmware, and new filters are on the horizon

http://www.diyaudio.com/forums/digital- ... ost5377384

My DAC now has potato flip flops and the isolators removed. Sounds really good.

Doubt we will see anything out of that for a while

anyone know what happened to Paul the moredamfilters guy

Like to compare analog filters to digital sometime

Hopefully get to do some 1121 stuff soon

[gstew]

Looks like new firmware, and new filters are on the horizon

http://www.diyaudio.com/forums/digital- ... ost5377384

My DAC now has potato flip flops and the isolators removed. Sounds really good.

I remember seeing schematics, diagrams, and pictures of this, but can't find them now. Can someone point me to them?

TIA!

Greg in Mississippi

[randytsuch]

There are some pics buried in this thread somewhere, by Nige.

I added a couple pics to my blog, and started an update to explain this last change.
Work in progress, take a few days to finish because I need to figure out what I did lol

Randy

[randytsuch]

Blogs updated to add my latest changes.
Take a look, and please let me know if it makes sense.

[gstew]

Randy,

That is good and I can duplicate from your blog updates. With the SDTrans384, I need to confirm whether the LC245A at the output of the I2S lines is doing reclocking or is just a line driver. If it does reclocking too, then all I need to do is bypass the isolator chips.

MANY THANKS!!!!

Update... looking at the SN74LVC245A datasheet, I don't see a clock input, so this may be a good reclock point. Will check with Bunpei.

My other Soekris is fed via an Allo.com Kali reclocker on top of an RPi.

Nige, how did your experiments with a fixed-rate clock into the Soekris FPGA work out? AND weren't you trying the 1121 at some point?

Greg in Mississippi

[nige2000]

Nige, how did your experiments with a fixed-rate clock into the Soekris FPGA work out? AND weren't you trying the 1121 at some point?

i know I've been bad and made no progress, the amp building have been quite the distraction,
ive actually just received a new si514 to put on that soekris,
as i pretty much failed to get the fixed clock to work at least not stabile
i hope to revisit the fixed clock thing again

ive looked at the 1121 yesterday, so maybe ill do something soon

[nige2000]

On the 1121 has anyone anywhere done any mods?
So far I've located the vref regs the mute transistors
On the digital side two regs I assume 1.2v and 3.3v
I see there a clock input lvds that goes direct to the +/- pads of the si514 I assume you just disconnect the power to the oscillator to enable external clocking

The fpga caps are so tiny I couldn't be bothered
Other than that it looks relatively simple to do

Ideas as always welcome

Nige