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Old 17th November 2012, 02:33 AM   #821
qusp is offline qusp  Australia
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fair enough, been there, as is thats probably the most prone thing to issues as there is no return for the individual i2s signals. lots of work in that cute little 'PCB' is that just cladded board youve cut, or protoboard youve added foil to?
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Old 17th November 2012, 11:36 AM   #822
supra is offline supra  Australia
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Can someone help me to connect an a amanero to a buff2?
The buff2 has D2, D1, DCK, and GND inputs. I presume pins 3 4 5 and 8 correspond on the amanero but which sequence, and is pin 6 in the mix.
Would be nice if there was a standard for this.
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Old 17th November 2012, 11:49 AM   #823
Dimdim is offline Dimdim  Greece
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Old 17th November 2012, 11:56 AM   #824
smanz is offline smanz  Spain
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Originally Posted by Dimdim View Post
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Is correct, but when play DSD, the channels are swapped over PCM.

My solution is to swap PCM channels in the player. I use Foobar, and is not posible software swap for DSD channels.

Last edited by smanz; 17th November 2012 at 12:04 PM.
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Old 17th November 2012, 12:04 PM   #825
HAL2010 is offline HAL2010  United States
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Swap D1 and D2 wires to change the channels for L/R.

A switch would let you swap as needed.
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Old 17th November 2012, 02:15 PM   #826
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I have a Denon 3910 that I modded to export I2S/DSD to my DAC. Same issue, I2S and DSD share but R and L channel are reversed with DSD. I used a Twisted Pear OTTO II (2:1 switch) to get the DSD channels correct. A mechanical switch on back of the Denon chooses which signal to export. A TP Teleporter transmits to the DAC.

I'll most likely use an OTTO II inside my B III DAC when I get my Amanero.
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Old 17th November 2012, 02:46 PM   #827
glt is offline glt  United States
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Quote:
Originally Posted by smanz View Post
Is correct, but when play DSD, the channels are swapped over PCM.

My solution is to swap PCM channels in the player. I use Foobar, and is not posible software swap for DSD channels.
Really? I had a suspicion but couldn't tell since one of the amps in my setup is out of commission and was listening with one channel. Seems the way PCM channels and DSD channels are configured are "standard". Perhaps, Amanero can add the option of swapping DSD channels in firmware.
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Old 17th November 2012, 02:52 PM   #828
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qusp said,
"the point is, when dealing with high frequencies, each signal needs its own return close to it as possible, or it radiates HF noise.... fact, its got nothing to do with just making sure the devices have a ground connection between them. thats why each of the signals in the ethernet cable and each of the signals on the PCB have a return/ground to go with them.

at these high frequencies, the air presents a low impedance (thats why radio signals can travel for billions of KM through air and space), it doesnt really care that much if it has a cable to travel on or not, if it doesnt have a nearby wire to travel on, it'll just go its own way through the air to the nearest point (of its choosing) if need be.

it is not OK to run a single ground, I dont care what Amanero says (if he does indeed say that, that would be strange considering hes given a return per signal on the PCB as there should be) it will work that way, but its not how it should be done."

Thanks for explaining that connection. I was getting a random snap like noise that I didnt get when using the tereadac usb device. I rewired the Amanero with about 25mm of cat5 solid wire twisted tight and the noise is gone. I get very few dropouts now and the Buffalo III is set at the lowest(best jitter) settings. I am still using the usb for power but that will change soon. Thanks for taking the time to explain this connect and being truly helpful in your responses. It is hard to be helpful sometimes when everyone "knows" best.
Very good information. Thank you.

For my high speed buffer (3.3V to 5V) I use the NC7SZ125. My I2S connections from the Amanero to the buffer are no more than 4 cm. The same for buffer to DAC board. i currently use a single I2S ground wire. To utilize separate "twisted" signal/ground connections, I'll need to increase the I2S wire length. Is it worth it?

Also...does the 5V signal from the buffer to the DAC board need separate signal/grounds as well?

Also
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Old 17th November 2012, 03:26 PM   #829
qusp is offline qusp  Australia
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I presume you want me to answer? the post is mine quoted by bikerboy. it doesnt have to be twisted, although its preferred, it just needs to have a ground for every signal. simple answer is yes you should, the short connections are meaningless in relation to this problem. you could also use mini 50ohms coax instead of twisted pair
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Old 17th November 2012, 05:37 PM   #830
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Thanks qusp.

I got some mini coax. I'm assuming that I just kind of "peel back" some of the shield and solder that to ground? it was difficult to see how the others attached it.
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