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Class D Switching Power Amplifiers and Power D/A conversion

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Old 24th October 2012, 11:02 AM   #5261
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Quote:
Originally Posted by Julf View Post
Disconnected - but observe electrical safety rules inside your box...
So, it's better to have no "ground" connection to the IEC connector?
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Old 24th October 2012, 12:30 PM   #5262
ChrisPa is offline ChrisPa  United Kingdom
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Quote:
Originally Posted by Mark Verhoeven View Post
So, it's better to have no "ground" connection to the IEC connector?
nc400 datasheet
section 12.3
specifically section 12.3.1
and figure 2
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Old 24th October 2012, 12:33 PM   #5263
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Quote:
Originally Posted by Johanson View Post
Can't find it on the Hypex website, could someone point me to it, and what program I would need to open the file on my computer. Do you save it as a PDF, or in pictures. I did try the file posted by mr_push_pull and downloaded WinRAR but I couldn't open the file unless I was doing something wrong. Thanks.
I guess there are tons of apps that can read the .dxf format but I use DraftSight (AutoCAD clone).

http://dl-ak.solidworks.com/nonsecur...aftSight32.exe
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Last edited by mr_push_pull; 24th October 2012 at 12:39 PM.
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Old 24th October 2012, 12:52 PM   #5264
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Quote:
Originally Posted by ChrisPa View Post
nc400 datasheet
section 12.3
specifically section 12.3.1
and figure 2
I did use the balanced connection like in figure 2 except for the ground connection, I did actually connect the IEC ground to the chassis.

I don't have ANY hum at all (perhaps due to my source having balanced output transformers), can there be any other sonic improvement if I remove the ground connection to the IEC connector?
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Old 24th October 2012, 01:06 PM   #5265
ChrisPa is offline ChrisPa  United Kingdom
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from section 12.3.1

"No safety earth connection was depicted. This is entirely acceptable if class II construction is used
throughout. Otherwise, connect the safety earth."

Connecting the mains earth gives an additional noise path - which doesn't mean that there will inherently be noise waiting to go down that path

Noise isn't just mains hum. It's any signal of any form or frequency composition that is not part of the original signal or a distortion within the original signal.
Whether that noise has an audible effect or not on the original signal is another matter. The recommend configuration in the data sheet gives you the best option for overall noise rejection. If you kept with class 2 construction you don't need the mains earth. Removing the earth may have no audible effect in your system.
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Old 24th October 2012, 01:38 PM   #5266
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O.K. thanks, I'd better open the casings soon. I also can fit the new input cable at the same time.
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Old 24th October 2012, 09:39 PM   #5267
Henkjan is offline Henkjan  Netherlands
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Quote:
Originally Posted by Bultrug View Post
...... going from the amplifier modules to the speaker binding posts. I understand these wires will be unshielded and are to be twisted, but what type/size (alloy/awg) would be best to use?
I chose some silver wire that I had laying around for the simple reason that they are NOT flexible and thus would stay put after twisting them. AWG is not that important for the ~10cm length of the wires from the amp to the rear of the cab
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Old 25th October 2012, 10:26 AM   #5268
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my boxes..
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Old 25th October 2012, 07:26 PM   #5269
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Default Confirmation on input to output gain math

Just wanted to see if some could confirm that if I wanted to increase the gain ratio from input to output, that I should choose a value for RG of under 1.2k.

For instance: a resistor value .800 mf would increase the gain multiplier to 6.5 as opposed to the factory 1.2k mf giving a gain multiplier of 4.67.

I'm basing the total gain off of: 4.17(1+2*RF/RG) for a 1V input.

I really need to raise the input gain so I can attenuate the output of my Phasure NOS1 more to lower the DC offset and keep the NCores from going into protect without adding coupling caps.

Thanks for anyone's help,

Todd
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Old 25th October 2012, 09:35 PM   #5270
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Please excuse the obvious error of referring to resistance in microfarads as opposed to ohms and kilo ohms.
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