Ncore diy

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#41
Julf said:
When you short the scope probe to ground?
Click to expand...

Yeah the scope probe and ground lead both connected to the ground outut stub of the scope.


Julf said:
Didn't the scope pictures clearly show a ~5 kHz noise signal?
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You mean the reading on the side bar which shows a 5Khz number?. That was switching back and forth.
But i do agree something is going on at 5KHz as i was able to observe a spike around 5KHz on the scopes spectrum analyzer as well.
 
#42
diyaudnut said:
Yeah the scope probe and ground lead both connected to the ground outut stub of the scope.
Click to expand...

You shouldn't have much noise in that situation. What amplitude is the noise?

You mean the reading on the side bar which shows a 5Khz number?. That was switching back and forth.
But i do agree something is going on at 5KHz as i was able to observe a spike around 5KHz on the scopes spectrum analyzer as well.
Click to expand...
I was just counting noise fuzz peaks per screen division, and arrived at something around 5 k..
 
#43
Julf said:
You shouldn't have much noise in that situation. What amplitude is the noise?
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reading says around 3mv

Julf said:
I was just counting noise fuzz peaks per screen division, and arrived at something around 5 k..
Click to expand...
Ah i was wondering if thats what you did, as the spike were pretty uniform on the 100Hz sine envelope. great, so that does confirm something is going on there. What could be the source. Hope the fairly inexpensive scope isnt adding things of its own
 

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#45
diyaudnut said:
reading says around 3mv
Click to expand...

That is pretty high. Do you have a second set of scope cables/probe you could perhaps borrow and try?

Ah i was wondering if thats what you did, as the spike were pretty uniform on the 100Hz sine envelope. great, so that does confirm something is going on there. What could be the source.
Click to expand...
Can't really think of anything. 5 kHz is a rather strange frequency for noise.

Hope the fairly inexpensive scope isnt adding things of its own
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It shouldn't. Even my $150 pocket scope does pretty well.
 
#46
Julf said:
That is pretty high. Do you have a second set of scope cables/probe you could perhaps borrow and try?

Can't really think of anything. 5 kHz is a rather strange frequency for noise.

It shouldn't. Even my $150 pocket scope does pretty well.
Click to expand...

I did try with both probes.
I dont have another scope though.

Let me try somethings. I will keep you posted.
Thanks for your help.
 
#48
btw, i have a feeling its the scope's noise floor.
The reading is high.

Sorry editing to clarify.
I connected the probe to a fully disconnected DAC and still see some of this, though lower.


Will continue investigating and keep the thread posted.
 
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#49
despinos said:
Hello,
I'm considering using an hypex amp for a central channel application, probably combined with a subwoofer. The speaker would be a Sunfire crmc, which is 8 ohms and accepts up to 450 watt.

If that speaker is cut off at say 100 hz to the sub, would a Hypex NC250 (mono, may not be the exact module name but roughly with 250 watt at 4 ohm) be enough for those mid and high frequencies or would a NC500 sound better? Listening Volumes would not be loud
Thanks in advance.

PS: not asking about subwoofer amplification
Click to expand...

A NC250MP does fine in 8 ohm. A NC400 with a SMPS600 does more, but for normal home use both should be fine. If you really want bleeding ears, have you thought of BTL?
 
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#50
Hello to everybody!

I wanted to ask you if is possible to build the core nc400 direct to the SMPS1200A400 instead of the regular one that comes with the kit. I was thinking may be O could get even more power. Do you know of someone doing this already?
Thank you for your answer,
 
#51
The SMPS600 is specifically designed for the NC400. The SMPS1200A400 is not (specifically). As you can read in the SMPS600 datasheet, the NC400 is the limiting factor with regard to current in 2 ohm. In 8 ohm, the input voltage is limiting. Since the NC400 itself is the limiting factor in 2 ohm, an SMPS1200 will not give you more power in 2 ohm. The SMPS1200A400 has roughly the same output voltage, so in 8 ohms it will also not increase performance. Hope it helps!
 
#57
https://www.hypexshop.com/DetailServlet?detailID=7607

Case Hypex DIY mono
Hypex mono block case. This is the exact same case as provided with the NC400 MONO KIT. The case is full aluminium for optimal heat conduction. It contains predrilled holes for the following modules with their respective supplies:

- NC400 + SMPS600
- UcD700HG + SMPS1200


Specifications

Colour: Black
Material: Aluminium
Outer dimensions: L27,5cm X W20cm X H8cm
LED board with cable to SMPS included

Contains NO connection materials (XLR/Binding posts/Mains connector or switch)
 
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