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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
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Old 21st January 2017, 10:35 AM   #5971
doc007 is offline doc007  France
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Hello,
I think I have found the reason for my problem.
First I phased the secondary of my transformer R-Core. 2 x 15 V. Grounding is done and I get with the bleeder 13.8V without plugging in the motherboard .
The 5V (Doede) power for the USB also works without problem but as soon as I ground the NEG of this power supply the fuse blows.
Should I just let the 5v power floating?
Does anyone have a logical explanation for this incompatibility?
Thanks
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Old 22nd January 2017, 10:07 AM   #5972
doc007 is offline doc007  France
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Quote:
Originally Posted by doc007 View Post
Hello,
I think I have found the reason for my problem.
First I phased the secondary of my transformer R-Core. 2 x 15 V. Grounding is done and I get with the bleeder 13.8V without plugging in the motherboard .
The 5V (Doede) power for the USB also works without problem but as soon as I ground the NEG of this power supply the fuse blows.
Should I just let the 5v power floating?
Does anyone have a logical explanation for this incompatibility?
Thanks
No answer ?


I also added a fuse to the general power supply.
2 Amp seems to me sufficient for the 12V supply of the 4 decks and the 5V USB ?

Here are the first photos
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Old 22nd January 2017, 02:40 PM   #5973
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by doc007 View Post
No answer ?


I also added a fuse to the general power supply.
2 Amp seems to me sufficient for the 12V supply of the 4 decks and the 5V USB ?

Here are the first photos
It seems there is an accidental connection to GND somewhere. Measure the resistances of the PSU outputs to GND.
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Old 23rd January 2017, 05:33 AM   #5974
dddac is offline dddac  Germany
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Quote:
Originally Posted by doc007 View Post
No answer ?


I also added a fuse to the general power supply.
2 Amp seems to me sufficient for the 12V supply of the 4 decks and the 5V USB ?

Here are the first photos
As the pictures do not show a complete wired situation, I like to ask you to make a schematic drawing and post a picture of it.
I am mostly interested in how power supplies connect to where, where you connect Ground and where you connect Chassis. Do not forget the signal out situation please. Do not exclude the 230VAC connected/safety ground. Do you aktually use them in the rest of your system? How is it connected to the next amplifier and the spdif out from your player and what about media player? Only when I see the complete situation, I might be able to help

just to make sure. The DAC works fine? Is it "only" the fact the 5 volt fuse blows when you put the ground to Chassis?

By the way, the 5 Volt should float as it is connected to the USB board Ground, which is the PC Ground, which you do NOT want into your DAC system. Hence the reason the WaveIO is isolated from the I2S bus and the DAC has it is own signal ground. Through the transformers you even Isolate the DAC further, which is good. You should only put the safety ground from the 230VAC to the chassis and connect that with pin 1 of your XLR and NOT connect it at the other end of your xlr interlink (only use pin2 and 3), or if you want pin 1 connected all the way through, do it through a ground breaker setup (I prefer the first)

but let's have a look first on what you did.

Oh, and when the fuse blows, does it blow with cables connected or without cable connected? and if there is a difference, what is it?


Of course there might be a simple wire problem somewhere, but I believe you already said you measured high impedance from NEG 5 Volt to Chassis right?
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Last edited by dddac; 23rd January 2017 at 05:36 AM.
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Old 23rd January 2017, 06:21 AM   #5975
dddac is offline dddac  Germany
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irrespective of your fuse problem, looking at the picture it looks you wired the XLR wrongly? Like you changed pin 1 and 3. Pls check
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Old 23rd January 2017, 08:02 AM   #5976
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by dddac View Post
By the way, the 5 Volt should float as it is connected to the USB board Ground
Really? The DDDAC docs show the 5 V PSU connected to GND.

Also, all metal parts that are accessible from the outside should be connected to safety earth, and that probably includes the USB plug for the digital input -- or am I wrong?
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Old 23rd January 2017, 08:10 AM   #5977
doc007 is offline doc007  France
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Quote:
Originally Posted by dddac View Post
As the pictures do not show a complete wired situation, I like to ask you to make a schematic drawing and post a picture of it.
I am mostly interested in how power supplies connect to where, where you connect Ground and where you connect Chassis. Do not forget the signal out situation please. Do not exclude the 230VAC connected/safety ground. Do you aktually use them in the rest of your system? How is it connected to the next amplifier and the spdif out from your player and what about media player? Only when I see the complete situation, I might be able to help

just to make sure. The DAC works fine? Is it "only" the fact the 5 volt fuse blows when you put the ground to Chassis?

By the way, the 5 Volt should float as it is connected to the USB board Ground, which is the PC Ground, which you do NOT want into your DAC system. Hence the reason the WaveIO is isolated from the I2S bus and the DAC has it is own signal ground. Through the transformers you even Isolate the DAC further, which is good. You should only put the safety ground from the 230VAC to the chassis and connect that with pin 1 of your XLR and NOT connect it at the other end of your xlr interlink (only use pin2 and 3), or if you want pin 1 connected all the way through, do it through a ground breaker setup (I prefer the first)

but let's have a look first on what you did.

Oh, and when the fuse blows, does it blow with cables connected or without cable connected? and if there is a difference, what is it?


Of course there might be a simple wire problem somewhere, but I believe you already said you measured high impedance from NEG 5 Volt to Chassis right?
First thank you for your reply.
I will give you a complete schema of my wiring

To help you better understand my problem I will clarify some things about my first tests.
On the general power supply I added a fuse of 2 A (DAC of 4 decks + USB power supply).
I test my 2 power supplies 12V and 5V without any connection with either the motherboard or the USB module.
The Ground is attached to the mounting screw of the R-Core transformer. At this level I fix the electrostatic screen of the transformer as well as the 0 volt of the 2 power supplies.
My 12V power supply is working properly with the 0V chassis
My 5V power supply also works correctly with the 0V chassis.
But when I put both 0 volts on the chassis, the general fuse (2A) melts but that of the 5V power supply is never melted

Thousand thanks for your help
Pierre
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Old 23rd January 2017, 09:10 AM   #5978
doc007 is offline doc007  France
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Quote:
Originally Posted by mbrennwa View Post
Really? The DDDAC docs show the 5 V PSU connected to GND.

Also, all metal parts that are accessible from the outside should be connected to safety earth, and that probably includes the USB plug for the digital input -- or am I wrong?
Effectively if you look at the photo DDDAC1794 - 2016 schuinvoor of the site of Audio Creative it seems to me that the 5V power supply of the USB module is floating?
So I should not be connecting the 0V of the 5V power supply to the ground ----> end of my power problems
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Old 23rd January 2017, 09:24 AM   #5979
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by doc007 View Post
Effectively if you look at the photo DDDAC1794 - 2016 schuinvoor of the site of Audio Creative it seems to me that the 5V power supply of the USB module is floating?
I see how this may avoid ground loops in the USB input, but I believe this is a safety issue. And the DDDAC documentation I linked before does show a GND connection of the 5V PSU.

Quote:
Originally Posted by doc007 View Post
So I should not be connecting the 0V of the 5V power supply to the ground ----> end of my power problems
It may help to stop killing your fuses. But something is not right. I have both the 0V outputs of the 5V and the 12V PSUs attached to the chassis, which is connected to safety earth. It all works nice and dandy (I had to make sure the USB ground loop does not create too much noise in the data transmission, though).
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Old 23rd January 2017, 09:36 AM   #5980
smooth dancer is offline smooth dancer  Norway
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doc007@

I see we have the same transformer, but mine is connected differently. It looks that you are using a half wave rectifier bridge ? I' m using full wave recrifier bridge where the secondaries Red-Grey and Purple-Blue are connected together.

As Doede already have comment, it looks like you have connected ground (1) on the xlr's.
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