Head-Fi.org › Forums › Equipment Forums › Dedicated Source Components › Audio-Gd Master 7 - Discrete Fully Balanced DAC (PCM1704)
New Posts  All Forums:Forum Nav:

Audio-Gd Master 7 - Discrete Fully Balanced DAC (PCM1704) - Page 64

post #946 of 2136

Dear DacLadder, I cannot tell you the exact pin possitions for the moment. I will tell you whenever i know. It is not possible for me to test right now. If any of you guys want to try before any feedback would be highly appreciated! I am quite sure from Kingwa and Lyuben inputs that it is a promissing solution. Let´s see what happens. In a month or so I´ll be able to post my own tests....:beyersmile::D

 

Thank you!!

JM

post #947 of 2136

I think I'm going to go with an M7 and add an OR 5 at a later date - comes out at similar price to the Vega but at least I can delay a portion of the cost.

 

Question though, the M7 specs says its I2S port is 3.3 V, and the OR 5 specs says its I2S is 5 V default with optional 3.3 V. When I'm ordering the OR 5 do I need to specify the 3.3 V version or is the higher 5 V default acceptable? Sorry if it's an obvious question to some but I'm not sure - and I know a few of you guys have an M7 + OR 5 combo in operation :) Thanks.

  1.  
post #948 of 2136

I would ask for 3.3V....:wink:

post #949 of 2136
I have one complete . Steve new what it was for and I had him make me a custom cable as well. He did mention this to me ?? I have not tried the or5 yet either. I will get back to you guys about this.
post #950 of 2136
Quote:

Dear DacLadder, I cannot tell you the exact pin positions for the moment. I will tell you whenever i know.

Appreciate that.  Also need to find out the 5-pin header connector vendor and/or pitch of the header pins (distance between pins).  So I can order some compatible mates to build a custom cable.   Also where are the RJ-45 I2S termination resistors?   The M7 RJ45 connector board appears to have some on the backside so not sure what those are for unless it is termination.

 

Quote:
Question though, the M7 specs says its I2S port is 3.3 V, and the OR 5 specs says its I2S is 5 V default with optional 3.3 V.

The M7 I2S interface is 5V compatible 3.3V logic according to Kingwa.  5V will work but their is less signal crosstalk using the lower voltage.  So yes order the 3.3V output OR5. 

post #951 of 2136

DacLadder, I will tell you the connector type as well. I had bought this connectors in the past but I cannot remember now. I think they are the same that picopsu uses (two different kinds, CPU and peripherics). My idea is to use the same internal cable that M7 provides (USb or I2S). I will try to get rid of white plastic connector and get the cables with termination pin and connect it to the new pcb. This way, you don´t need to do any custom cable. Regarding RJ45 connector I think it is not necessary, I think this little pcb only does cable matching but cannot tell. What I do know, is that Kingwa told me that I could exchange USB or I2S pcb with amanero without matter (even he recommends using his USB32), so in my case is what I intend to do. Sorry, cannot really help you.

 

Alrainbow, which custom cable did Steve did for you?? Revelation one? Which type? BTW, OR5 uses XMOS????

 

I will be ordering M7 in a couple of weeks. Can´t wait!!! I am so excited!!:ksc75smile:

 

Thanks a lot guys!

 

JM

post #952 of 2136
Cable is revelation it's purple and a cat7 shieled type. With shielded connectors

And my unit is confirmed at 3.3 volts by Steve's email just now
I can post a pic if need be it cost about 400.
post #953 of 2136
Thanks all smily_headphones1.gif
post #954 of 2136

all  or5 are 3.3 volts . Steve  replied

post #955 of 2136

DacLadder, check JST connectors. May be I am wrong, but it is what I figure out from the photos....

Thank you Alrainbow, I know the cable, it seems the One....:wink_face:

post #956 of 2136

Cipher!, sorry I didn´t read well..... Let us know your opinion whenever you test it! 

 

Kind regards...

post #957 of 2136
Quote:

DacLadder, check JST connectors. May be I am wrong, but it is what I figure out from the photos....

I'll check it out, thanks.  Kingwa responded to my Email about the DSP board's I2S header connector pinouts, connector pin pitch, and location of termination resistors.

 

The termination resistors for the external I2S RJ45 are located on the RJ45 connector circuit board mounted to the backplate.  So if the  RJ45 board is removed termination needs to be provided.  I am referring to an OR5 type cable implementation.  A substitute USB receiver board may need something totally different.

 

The pitch (distance) between I2S header pins is 2.54mm (0.1").   This eliminates a lot of guessing for finding header mating connectors.

 

The DSP board I2S header connector pinouts when facing the Master 7 front, left to right, are the following:

 

Pin 1 -  GND

Pin 2 -  SDATA

Pin 3 -  SCLK

Pin 4 -  WCLK

Pin 5 -  MCLK

 

I need to get an oscilloscope on the current RJ45 I2S implementation.  If the clocks look OK at destination then all this extra work is not necessary.   That should happen in the next few weeks.


Edited by DACLadder - 11/16/13 at 7:19am
post #958 of 2136

Dacladder, so you want to connect OR5 directly into M7 MB? Why do you want to use the oscilloscope?

Thank you for info.... :wink:

post #959 of 2136
Quote:

Dacladder, so you want to connect OR5 directly into M7 MB? Why do you want to use the oscilloscope?

Before I go to the trouble and expense of removing the internal RJ-45 board and 5-pin ribbon cable I simply want to verify it is really worthwhile.  I can also verify quality of my home built I2S cables and if needed move on to something else like the unified cable.  So if one cable sounds better than another I would like to correlate why.

post #960 of 2136
Quote:
Originally Posted by ciphercomplete View Post

I have a AP1+PP due to arrive in a little more than week from now so you can bet I will be comparing it to the USB32 immediately.  I have had no playback issues with the USB32 since I upgraded the firmware a couple of months ago.

I'm looking forward to hearing your findings. I've found the AP2/PP feeding input #1 and #3 you can definitely hear a significant difference between the two receiver chips. My #3 is BNC as well, but still feeding the 8805. I prefer #1.

I've reinstalled my audio-gd drivers, software etc. But still get mysterious stoppages using jriver kernel streaming or ASIO. Maybe it's a problem with jriver? MOG streaming out to USB32 works flawlessly. Anyway still trying to get it working reliably.

Question for anyone -
Any preference on plugging straight into the wall vs a power filter/surge protector etc?
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Dedicated Source Components
Head-Fi.org › Forums › Equipment Forums › Dedicated Source Components › Audio-Gd Master 7 - Discrete Fully Balanced DAC (PCM1704)