rkn80

Re: Modular multi channel DIY AD/DA Box
« Reply #640 on: November 15, 2014, 04:39:19 PM »
@chefducuisine: I'm an AES member. I'll have a look at the AES67 doc. But as it is stated on the ravenna website: Ravenna is not AES67, it is compatible. So their might be minor differences. I once downloaded the ravenna white paper but it did not have enough info's to implement it. But it might have changed and I should have a look again.

@ joaquins:
Just kidding.  ;)

I'ld like to focus on the USB and ADAT connectivity replacement first, that is difficult enough...


rkn80

Re: Modular multi channel DIY AD/DA Box
« Reply #641 on: December 09, 2014, 05:18:45 AM »
I've some news:
I just ordered a prototype board for the USB connectivity. I hope that the PCB and components will arrive before Christmas so that I can do some soldering and programming during the Christmas holidays.  8)

R.

rkn80

Re: Modular multi channel DIY AD/DA Box
« Reply #642 on: December 26, 2014, 02:23:31 PM »
I made an extra thread for the UAC2 interface:
http://groupdiy.com/index.php?topic=58202.msg740733#msg740733
You can follow the building process there.
For discussions about it I suggest to do it either in this thread or we open a new thread for it. I'ld like to keep the photostory thread free of general discussions about the interface.


R.

iomegaman

Re: Modular multi channel DIY AD/DA Box
« Reply #643 on: April 25, 2015, 02:58:07 AM »
Just wanted to say I spent about 4 hours reading this entire thread, and it is amazing Rafael got as much done as he did, there were a lot of folks asking for the moon, at any rate I am currently building 2 sets (8-ADC/AES) which I will dump into my Lynx AES daughterboard (slaved to the Lynx TWO mainboard) which will give me an extra 8 channels in...

I will let folks know and do a test set up to compare with the Lynx converters as well as do some comparisons with an Apogee converter on a Mac...(I have a converter box that will let me do one channel of AES>Spdif/Optical which I can compare in the MacBook)

Besides that I have a Kurzweil that will allow me to compare it to yet another converter as well as the PCM4222 EVAl board which I can play around with the clocks I2S etc...(which has been collecting dust for many years but it does Spdif/Toslink and I2S as well as AES if I recall...

But first more coffee so I can hand solder the smd...

Wanted to say thanks to Rafael for this project, he has the patience of a god in my humble opinion and has done a great service in answering politely every question and request...

Like the majority of posters here he is quite decent.
Since the development of the internet millions of people have died, the two may or may not be related.

Re: Modular multi channel DIY AD/DA Box
« Reply #644 on: June 11, 2015, 10:21:19 AM »
Hello everybody,

I'm new on this forum and this post is my first one ... did'nt found a place to introduce myself ...  :-\

I read this long, long thread yesterday, and first, I must greet Raphael, it is an inclredible job !

I have lots of questions about all this stuff. I hope Raphael or anabody else can answer.

1) Developped modules :
If I understood well everything I read, there already are :
   - DAC module, which take 2 I2S stream line and create 4 (differential) analog out
   - ADC module, which take 4 differential analog in and create 2 I2S stream
   - AES module, which is a converter from/to AES to/from I2S. How many channel ?
      (I deal with I2S channel hier and 1 i2S is 2 analog channel)
      Is AES S/PDIF or something else ?
   - ADAT module which is a converter from/to ADAT to/from I2S.
      how many channels ?
   - WordClock module which can select the master clock and give it to each module and the wordClock out
   - One motherboard which is just a physical support for data and clock bus, and which generate power supplies
On this par, am I right ?

2) Under developpement modules
I read a lot about lots of modules ... usb, ethernet ... I'm sure Raphael is working on USB (and there are others questions I'm going to ask in the good thread)
... someone is working on the ethernet or is it dead?

3) Connectivity
Is there anywhere a schematic of all possible configurations ?
For example is it possible to have 1 wordClock module (I think it is an obligation), 4 ADC modules, 2 DAC modules and 1 USB module (whenit will be completed), in order to do a big "sound card" ?

4) About digital audio
I read that the clock is one of the most important thing ... can someone explaine in simple words why ?
As clock is a fast signal ... we can't do "Y" duplication with a clock cable, it needs a buffer I imagine ?
can we do a Y duplication with data signals ... for example ... 1 adc channel out goes to usb for recording and a DAC module to be monitored (it is just an example !)

Again, thousand greetings to you guys for this incredible work !

M.

rob_gould

Re: Modular multi channel DIY AD/DA Box
« Reply #645 on: September 29, 2015, 12:01:11 PM »
8 x channels of ADC and DAC available for sale in the Black Market, just in case anyone's interested...

http://groupdiy.com/index.php?topic=60569.0


rkn80

Re: Modular multi channel DIY AD/DA Box
« Reply #646 on: November 24, 2015, 03:15:59 PM »
Some exciting news:
The prototype of a new mainboard is on the way to me. PCB is already shipped, components will be shipped in two days.

R.

Re: Modular multi channel DIY AD/DA Box
« Reply #647 on: January 19, 2016, 08:50:01 AM »
Are there any AES boards still available?

Re: Modular multi channel DIY AD/DA Box
« Reply #648 on: April 14, 2016, 09:30:57 AM »
The schematic of the clocking board is done.
Please note that this is a version with the intionention of having it running after soldering meaning that you don't have to program a device.
We discussed DDS and Microcontroller based solutions prior maybe such a solution will come in the future. It would be nice but I've currently no concrete plans to go there.

Raphael

Hi Raphael,

In the schematic, you have the CDCE913 Y3 clock output as the input for 4046 phase comparator.

Because no micro-controller unit or programming is involved, hence Y3 divider value = Y2 divider value = Y1 divider value = 1, the CDCE913 factory default setting.  Which also means that Y3 = Y2 = Y1 = VXCO.

Therefore, your PLL setup is a 4046 phase comparing external word clock (48KHz, 96KHz, or 192KHz) with VXCO.

In TI Application Report "Generating Low Phase-Noise Clocks for Audio Data
Converters from Low Frequency Word Clock" (SCAA088.PDF), the PLL setup is a 4046 phase comparing external word clock with the CDCE913 Y1 clock output divided internally by either 512 for 48KHz, 256 for 96KHz , or 128 for 192KHz. And to set this internal divider value on the fly is by programming via the I2C bus pins (S0, S1, S2)

So... I'm a bit confused. Which one is correct or better?  Perhaps you can explain to this newbie :)

Elegost

Re: Modular multi channel DIY AD/DA Box
« Reply #649 on: October 26, 2016, 09:21:24 PM »
Hello,

I would like to understand why, in this post

http://groupdiy.com/index.php?topic=35486.msg583101#msg583101

rkn80 said "I think it is not the badest idea to have an ADAT interface.
I'm not sure anymore wether Mikkel's boards will work because I recognized that the clocking of the wavefront devices is inverted compared to the rest of the AD/DA chip world. "

I'm looking at the data sheets for the Wavefront 1402
http://www.wavefrontsemi.com/DataSheetsFolder/WavefrontAL1402.pdf

and the TI PCM4104
http://www.ti.com/lit/ds/symlink/pcm4104-ep.pdf

and from what i can tell with my very limited comprehension, they both support a wordclock that is high first and left-justified 24 bit data output with most significant digit first. 

Is the problem that the bitclock signal for the 1402 is high first and for the PCM4104 it's low first? Am i reading that right?  Could that be solved with an inverting circuit between the output of the 1402 and the input of the 4104?

Thanks for any help.





Re: Modular multi channel DIY AD/DA Box
« Reply #650 on: October 26, 2016, 10:37:24 PM »
Is the problem that the bitclock signal for the 1402 is high first and for the PCM4104 it's low first? Am i reading that right?

In left justified mode, AL1402 outputs a rising edge bit clock and the PCM4104 expects a falling edge bit clock.

Quote
Could that be solved with an inverting circuit between the output of the 1402 and the input of the 4104?

I'd probably use a 74LVC1G04 (single inverter logic) in between them, running from the same digital supply as the PCM4104.

Elegost

Re: Modular multi channel DIY AD/DA Box
« Reply #651 on: October 27, 2016, 01:51:46 AM »
Perfect, thanks!

Martin Griffith

Re: Modular multi channel DIY AD/DA Box
« Reply #652 on: November 12, 2016, 01:14:50 PM »
http://www.wavefrontsemi.com/index.php?products

This part is End Of Life. Purchase is no longer available for AL1401AG. Last time purchase date for AL1402G is November 30, 2013.

usekgb

Re: Modular multi channel DIY AD/DA Box
« Reply #653 on: November 12, 2016, 02:13:38 PM »
http://www.wavefrontsemi.com/index.php?products

This part is End Of Life. Purchase is no longer available for AL1401AG. Last time purchase date for AL1402G is November 30, 2013.

The CoolAudio replacement is available from CabinTech in single pieces. 
http://www.cabintechglobal.com/?tab=semi&prod=V1402
Zach Griffen Audio
EvilTone

Keox35

Re: Modular multi channel DIY AD/DA Box
« Reply #654 on: March 08, 2017, 01:08:31 PM »
Hi everyone,

First of all, a big congratulation to Raphael for his incredible work !

I know it's a diy site, but maybe this can be interesting : https://www.audinate.com/products/manufacturer-products/dante-brooklyn-ii

It's a interface made by Audinate (creator of Dante) that allows any DAC / ADC to be connected to a dante network through TDM or I2S. Am i wrong or can it be used to connect the converter board you designed to a Dante network !?

Good luck for the rest,
Cheers