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Old 29th September 2013, 09:32 AM   #1861
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Someone on raspyfi.com recommends this:
4.17uV Ultralow noise DAC power supply regulator 3.3V/5V 1Ax4 - DIYINHK

It gives you 4x 3.3 or 5 volt with low noise at max 1A. Not sure it will be better than the Salas Low Voltage regulator. It is easier because you do not have to solder yourself.
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Old 29th September 2013, 11:55 AM   #1862
palmito is offline palmito  United States
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Quote:
Originally Posted by Vbenonisen View Post
Does anybody on this thread know how much current the 3.3V isolated i2s output on the WaveIO is using?
Don't know if this will help, from post #1672 ( XMOS-based Asynchronous USB to I2S interface

Quote:
Originally Posted by Lorien View Post
The WaveIO card usually needs up to 380mA when working at 24/192. My previous estimations were all wrong and I'm sorry about that. Anyway I'm not upset (too hard) about it as it's better to have some extra current for "just in case" situations rather than be on the opposite end (like when you will power your WaveIO board from the USB bus). Edit: forgot about NVE isolator. The datasheet is located here and at pages 5 and 6 you will see the infos you need (look for Idd2 of IL715 part). I say that 20mAmps @ 3.3Vdc will do the trick.

Kind regards,
Lucian
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Old 29th September 2013, 02:15 PM   #1863
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Looks like the isolated i2s output needs 20mA at 3.3V if I understand it correctly. Thank you for the quote palmito.
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Old 23rd October 2013, 03:28 PM   #1864
wxn is offline wxn  Lithuania
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Confirmed, it works!

Quote:
Originally Posted by zigzagflux View Post
So, after trying to interpret the CS8420 datasheet, I think I have a way to get I2S into the DCX. I havenít inspected the board yet to see how feasible this will be, but it looks reasonable. Hopefully someone who better understands the ASRC is able to deny or confirm this information.

Remove TR1 and R15
Isolate/lift pins 12 and 14
Jumper pins 2 and 3 and 5
Jumper pins 4 and 23
Jumper pins 27 and 28
Jumper pins 19 and 22
Isolate pin 20 and tie to pin 23
Connect I2S leads from XMOS:
ILRCK = pin 12
ISCLK = pin 13
SDIN = pin 14
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Old 23rd October 2013, 05:32 PM   #1865
Corpius is offline Corpius  Netherlands
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Quote:
Originally Posted by audionootje View Post
Someone on raspyfi.com recommends this:
4.17uV Ultralow noise DAC power supply regulator 3.3V/5V 1Ax4 - DIYINHK

It gives you 4x 3.3 or 5 volt with low noise at max 1A. Not sure it will be better than the Salas Low Voltage regulator. It is easier because you do not have to solder yourself.
Easier yes, but it costs much more and isn't soldering it yourself the essence and fun of diy?
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Old 23rd October 2013, 06:19 PM   #1866
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True, but the TPS7A4700 regulator seems to be quite good and nearly impossible to solder yourself. At least for me that is.
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Old 24th October 2013, 06:32 AM   #1867
Corpius is offline Corpius  Netherlands
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It's not easy to solder, correct. And it is a very good regulator too. I didn't mean to discourage anyone to buy the DIYINHK supply with my post. I have no experience with the TI's regulator, but I do know that Salas's power supply is very good (and fun and informative to build).
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Old 26th October 2013, 11:27 AM   #1868
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Hi together,
after update to "MAV" ... no more 384
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Old 28th October 2013, 03:10 PM   #1869
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I am new to WaveIO and am running the isolated SPDIF output to my TP Buffalo 3 DAC, just to get a first impression. SQ is already impressive, but I want to connect it via I2S now.
The question is what is preferred: the isolated or non-isolated I2S connection? I am sure others have compared these two options already. So perhaps I don’t have to reinvent the wheel.
It could be that this issue is already covered somewhere in this long thread.
Any thoughts?

Peter
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Old 29th October 2013, 11:24 AM   #1870
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Quote:
Originally Posted by pietjers View Post
The question is what is preferred: the isolated or non-isolated I2S connection?
Some say the non-isolated sounds better but one point to consider is that it's probably easier to use the isolated connector. My suggestion FWIW would be to start with that and either experiment later or do as I did - fit it then forget about it.
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