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Class D Switching Power Amplifiers and Power D/A conversion

Problem with Hypex Ncore
Problem with Hypex Ncore
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Old 5th October 2014, 08:18 PM   #1
Koifarm is offline Koifarm  Netherlands
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Default Problem with Hypex Ncore(solved)

Last month i have bought 2 Ncore400 modules but after installing them there was a high pitch noise in the output. My supplier send me two new ncore's and they have the same problem. These are R5 pcb's from the latest batch. Are there more people who have the same problems? May be do i have another problem.

Last edited by Koifarm; 9th October 2014 at 07:50 PM.
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Old 6th October 2014, 09:22 AM   #2
Julf is offline Julf  Europe
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Have you had earlier nc400's in the same configuration without noise? Have you followed the guidelines about twisted wires and avoiding loops in the output cables? What is your ground/earth scheme?
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Old 6th October 2014, 05:20 PM   #3
Koifarm is offline Koifarm  Netherlands
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yesterday i treid a linear power supply and the noise was gone. So the smps generate interference with the ncore. But the smps function good with normal UCD400.
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Old 6th October 2014, 05:25 PM   #4
Julf is offline Julf  Europe
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Exactly the same circuit layout?

When you say "linear" power supply, I assume it is an unregulated supply (just a transformer, rectifier bridge and filter capacitors)?

You haven't answered my questions about twisted wires, output cable routing and ground/earth scheme.

Which SMPS are you using? In my experience the SMPS600 is extremely quiet.
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Old 6th October 2014, 05:32 PM   #5
Koifarm is offline Koifarm  Netherlands
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Yes, the linear supply is a unregulated supply.
I use smps400a400 the 600 is to expensive and i have already build 2 ncore amps with same configuration and connections. Tomorrow i will try to place one of the latest ncores in an other amp.
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Old 6th October 2014, 05:33 PM   #6
Destroyer OS is offline Destroyer OS
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Ya, what SMPS?

And what linear? Wouldn't you need either two transformers or a regulator? 60 +/- and +12v?

I've been thinking about powering an NC400 with a linear for awhile. Everyone talks about how "amazing and high-tech" the SMPS is but... I've been into the sound of linear with class D.

Sure it's not just a bad solder joint on one particular SMPS board?
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Old 6th October 2014, 05:33 PM   #7
Julf is offline Julf  Europe
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Quote:
Originally Posted by Koifarm View Post
i have already build 2 ncore amps with same configuration and connections.
And they all have noise issues, or just some of them?
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Old 6th October 2014, 05:34 PM   #8
Julf is offline Julf  Europe
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Quote:
Originally Posted by Destroyer OS. View Post
I've been into the sound of linear with class D.
Doesn't that kind of defeat many of the benefits of class D?
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Old 6th October 2014, 05:38 PM   #9
Destroyer OS is offline Destroyer OS
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Quote:
Originally Posted by Julf View Post
Doesn't that kind of defeat many of the benefits of class D?
Compared to any constant current power supply that bleeds off 200-godknowswhat watts of energy every moment of it's life??? NO.

Wikipedia

Linear:

"If regulated: efficiency largely depends on voltage difference between input and output; output voltage is regulated by dissipating excess power as heat resulting in a typical efficiency of 30–40%.[15] If unregulated, transformer iron and copper losses may be the only significant sources of inefficiency."

SMPS:

"Output is regulated using duty cycle control; the transistors are switched fully on or fully off, so very little resistive losses between input and the load. The only heat generated is in the non-ideal aspects of the components and quiescent current in the control circuitry."

However lots of SMPS's produce significantly more heat than unregulated linear (varies greatly with SMPS). I was thinking non-regulated. I think their estimates on regulation is for something shitty, btw.

Last edited by Destroyer OS; 6th October 2014 at 05:45 PM.
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Old 6th October 2014, 05:47 PM   #10
ds23man is offline ds23man  Netherlands
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Koi,

Maybe it is wise to use the advised power supply recommended by Hypex.

Or is this a Hypex bashing thread after you left a Dutch diyaudio forum doing the same?
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