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Old 23rd January 2015, 11:56 AM   #881
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Join Date: Jun 2013
were like children waiting for this
mine showing shipped im sure the ups notification will come when it gets through the system
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Old 23rd January 2015, 12:16 PM   #882
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Location: Copenhagen
Quote:
Originally Posted by Superdad View Post
Yes, but supplying the USB>I2S board from the computer's USB VBUS really sucks! My personal DAC has multiple, choke-filtered power supplies in it (though they are perhaps not as isolated from one another as I would now like).

So I don't care whether the USB board gets its power from a discrete PS inside the DAC box (can still be galvanically isolated), or from a power "injector" USB cable device--just don't feed it the crap from your computer.
Would you find the USB power from a Squeezebox just as "dirty"?
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Old 23rd January 2015, 01:05 PM   #883
ristar is offline ristar  Singapore
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Join Date: Mar 2013
Hopefully Soren didn't miss my pm in Sept? I haven't got shipping confirmation and I paid since 12 Jan.
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Old 23rd January 2015, 01:21 PM   #884
soekris is offline soekris  Denmark
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For info:

Some of you might receive your dam1021 R-2R DAC boards today, docs needed to get started will be available sometimes late today.
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Old 23rd January 2015, 01:23 PM   #885
soekris is offline soekris  Denmark
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More info:

I don't do the actual order processing and shipping, the two online stores handle that. And if you entered the email address correctly, you usually get tracking emails from UPS. But it will take a couple of days to get everything shipped, and the US store won't be able to ship until Monday as the boards need to get there....
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Old 23rd January 2015, 01:25 PM   #886
Eldam is offline Eldam  France
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Have my tracking number for a reception planed next tuesday

thanks Soren to you and your team.
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Old 23rd January 2015, 01:33 PM   #887
Eldam is offline Eldam  France
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Location: France
Quote:
Originally Posted by DQ828 View Post
This is what I did.
Is there any interest to some surgery on the USB cable to cut the the power and gnd return path (same wire Gnd that the signal return path?) when using external power supply to Amareno. In this case,we could keep the LDO which output drop is 3.3V and use a 5V before (any vias near the entry LDO volatge Pins or direct from the USB voltage pin ?

So double isolation if USB pcb : one for the PCB and the Soekris one ? Soren said the embeded isolation of the DAC should suffice ! More is better. My heart is balancing between a cheaper Amareno for that and a more sota one with isolation but longer to get ! As the isolation on an USB is at it output what could be the utility as the DAC has one at its entry ?

But I really ask myself because testimonials on the other thread (implementation) if a USB at 32/384 is better than a 24/44 TCPIP to SPIDF streamer ? Ok one said there is an isolator and recloking in the DAC boards ! But TCPIP and SPIDF are bit perfect in their transmission ! Does the streamed flux from the computer can be corrupted because the noise of the PC with a too Noisy USB pcb streamer ? Async USB does solve some problems in relation with the PC already, no ?

Sorry for the two cents questions

Last edited by Eldam; 23rd January 2015 at 01:45 PM.
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Old 23rd January 2015, 02:47 PM   #888
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Location: LA
Quote:
Originally Posted by Eldam View Post
Is there any interest to some surgery on the USB cable to cut the the power and gnd return path (same wire Gnd that the signal return path?) when using external power supply to Amareno. In this case,we could keep the LDO which output drop is 3.3V and use a 5V before (any vias near the entry LDO volatge Pins or direct from the USB voltage pin ?

So double isolation if USB pcb : one for the PCB and the Soekris one ? Soren said the embeded isolation of the DAC should suffice ! More is better. My heart is balancing between a cheaper Amareno for that and a more sota one with isolation but longer to get ! As the isolation on an USB is at it output what could be the utility as the DAC has one at its entry ?

But I really ask myself because testimonials on the other thread (implementation) if a USB at 32/384 is better than a 24/44 TCPIP to SPIDF streamer ? Ok one said there is an isolator and recloking in the DAC boards ! But TCPIP and SPIDF are bit perfect in their transmission ! Does the streamed flux from the computer can be corrupted because the noise of the PC with a too Noisy USB pcb streamer ? Async USB does solve some problems in relation with the PC already, no ?

Sorry for the two cents questions
I don't think you can cut the USB ground wire. USB requires impedance control for the entire signal path, and you need the ground to control the wire impedance. This would be the shield ground, but the shield ground will be tied to the PC ground which then gets tied to the Amanero ground.

For 5V, there are ready made USB power injector adapters, that allow you to add external 5VDC to a USB cable. I have a couple that I was playing with before.

But, I was just reading a thread at audiocircle about a guy who reported good results by modding a USB cable to seperate out the power/ground lines from the signal lines.
usb cable mod

As for USB versus SPDIF, IMHO nothing is perfect, and you need to pick your poison . I'm going usb, but I also have a heavily modded pc to generate the usb output.

Randy
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Old 23rd January 2015, 02:52 PM   #889
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Quote:
Originally Posted by DQ828 View Post
This is what I did.
From your previous post, I thought you were feeding the Amanero 3.3V, but in that pic it seems you are feeding it 5V, and left the 5V to 3.3V converter in place to generate 3.3V.

I verified last night that I need 5V connected to my USB card, or my PC doesn't see my Amanero/DAC. Once I connect 5V, everything is good.

I use a modified Silverstone EC04-P PCIE to USB card. The mod is to feed it 3.3V from a dedicated linear PS, instead of using 3.3V from the motherboard.
I connect 5V to a molex connector on the Silverstone card.

Also, my Amanero has the 5 to 3.3V convertor removed, and it gets 3.3VDC from my DAC.

Randy
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Old 23rd January 2015, 03:12 PM   #890
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afaik i think pc gnd is needed
usb a and b plugs are available on eBay its relatively easy to make your own cable without +5v
but the external +5v usb cable mod has good effect

id be curious to know what the ec04 usb card needs 5v for randy
its not required for my ec01's with/without the clock mod
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