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Old 3rd April 2013, 09:49 AM   #6671
Julf is offline Julf  Europe
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Quote:
Originally Posted by Larsas View Post
Two good pages on grounding here, complete thread:

speaker terminals to chassis ground?
And perfectly summarized:

Quote:
Originally Posted by AndrewT View Post
Safety ground must be attached to chassis.
Audio ground is usually separate from chassis.
They are two completely different animals.

However, to fully comply with the requirement that all exposed conductive parts must be connected to Safety Earth then many builders and some manufacturers adopt the debatable practice of directly connecting Audio Ground to Chassis.
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Old 3rd April 2013, 03:07 PM   #6672
omainik is offline omainik  Austria
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Default DC on input

Hello,

does the NCORE input circuit accept DC voltage on both inputs in relation to ground?

I am planning a new I/V stage for my dac, so it would be easier to accept a DC offset on both positive and negative output in relation to ground. in relation to each other it is easy to achieve zero volt dc offset.

thanks
Peter
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Old 3rd April 2013, 03:11 PM   #6673
Julf is offline Julf  Europe
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Quote:
Originally Posted by omainik View Post
does the NCORE input circuit accept DC voltage on both inputs in relation to ground?
From the data sheet: Common mode rejection ratio: 55 dB, max input voltage +/- 15 V.
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Old 3rd April 2013, 03:50 PM   #6674
troystg is offline troystg  United States
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Quote:
Originally Posted by mangew View Post
Ok, a following up question.

Here are a picture as it seems to me a nice proper build, and here have the builder grounded the power supply with a wire directly to the ground on powersupply from the IEC inlet.
http://jamesromeyn.com/wp-content/up.../IMG_41171.jpg

I was thinkin to put a grounded wire from the IEC ground pin to one screw on the IEC and another wire from the powersupply (silver ground pin) to the other screw that fasten the IEC.

Is it better option to ground as shown in picture or the way i was thinking or it doesn´t matter?

Grounding 101.... The wheel has been invented long before us.

Grounding and Shielding Audio Devices
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Thinking positive doesn't make things better, it makes you a better person.
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Old 3rd April 2013, 05:07 PM   #6675
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Quote:
Originally Posted by troystg View Post
Grounding 101.... The wheel has been invented long before us.

Grounding and Shielding Audio Devices
Well that sure covers the topic in detail.
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Old 3rd April 2013, 07:02 PM   #6676
omainik is offline omainik  Austria
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Quote:
Originally Posted by Julf View Post
From the data sheet: Common mode rejection ratio: 55 dB, max input voltage +/- 15 V.
thank You Julf,

this helps me further with the design
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Old 4th April 2013, 06:09 AM   #6677
ds23man is offline ds23man  Netherlands
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Before we write ten pages about grounding solutions, maybe it is wise to take a closer look at the NC400 and SMPS.

The baseplate of the NC400 is connected to the signal ground and 0v power connection. The metal stud of the smps is also connected to the 0v.

If you screw them in a metal case the signal ground is never floating!!!!!!!

And to prevent strange current flows the pin 1 of the XLR and the shielding of the input cable should be connected to the chassis.
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Old 4th April 2013, 08:14 AM   #6678
Julf is offline Julf  Europe
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Quote:
Originally Posted by ds23man View Post
And to prevent strange current flows the pin 1 of the XLR and the shielding of the input cable should be connected to the chassis.
Absolutely. But I think the issue and confusion is about the mains earth (the centre pin of a 3-pin IEC power connector). There is no need, from a signals point of view, to connect it to the chassis, but unless you know what you are doing, it is a good idea from a safety point of view.

The other issue is people who build their amps with acrylic or wooden enclosures without a metal chassis - they need to pay attention to their ground paths.
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Old 9th April 2013, 05:07 PM   #6679
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looks like there's a new custom case maker making some monoblock cases for the ncore
The Emotiva Lounge - Kraemer Designs KD~D400 Hypex NC400 Mono Amp Build
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Old 9th April 2013, 05:40 PM   #6680
ds23man is offline ds23man  Netherlands
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Quote:
Originally Posted by ufokillerz View Post
looks like there's a new custom case maker making some monoblock cases for the ncore
The Emotiva Lounge - Kraemer Designs KD~D400 Hypex NC400 Mono Amp Build
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