Hypex Ncore

sherlockth · 2012-06-01 3:00 pm

Audioschipper said:
Nice! But I still think you should twist your inner cables ( as mentioned in the datasheet)

Thanks, I will do that. Maybe that is the cause of some very low humming noise that I have.

souldriver · 2012-06-01 6:08 pm

I need your help...please!!!

Hi
Finally i got my Ncore's and i just put the amp together....but....
I just got a little thiny fizzy sound :h_ache:

. I really tried to connect everything as mentioned in the manual but something must be wrong and i could not found out what it is. Could somebody have a look on the pictures? (i tried the searchfunction but i did not found anything that could help me!)
Thanks a lot!

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63781 · 2012-06-01 6:22 pm

Do all the red LED's light up on the NC400 modules?

waltzingbear · 2012-06-01 6:45 pm

StigErik said:
Do all the red LED's light up on the NC400 modules?

you mean because he doesn't have the Nampon wires grounded?

the black wires that are floating in the pictures need to be attached to ground to take the amp out of standby mode, RTFM.

Also get all that extra AC cable out of there and off the SMPS heatsink. it however is not the problem you have right now. Never attach a piece of plastic to a heat sink, especially when that plastic is holding your AC!

Alan Garren

souldriver · 2012-06-01 6:54 pm

Hi Stig, Hi Alan
Thanks for answering!
Yes the red LEDS light up. The small black wires are connected normaly to the ground - (white plastic with the yellow earth/wire-but not on the picture!).

Alan, I will change the layout again, but it has to work first. Thanks for your advise!

As i said before i can hear the music out from the loudspeaker but it sounds very low, thiny and fuzzy ... and i can hear the music also from the amp!!!....strange! Any idea??

63781 · 2012-06-01 6:58 pm

It may look like your speaker connectors are NOT insultated from the chassis? This will mean you have a short-circuit of the amp output, and very little sound .....

souldriver · 2012-06-01 7:07 pm

Thanks Stig, i will check this....l

Juhleren · 2012-06-01 7:23 pm

StigErik said:
It may look like your speaker connectors are NOT insultated from the chassis? This will mean you have a short-circuit of the amp output, and very little sound .....

I can´t see the speaker wires being properly connected in the pictures (only one channel in one picture).
Are the pics from during assembly or showing the current setup?

cheers,

sherlockth · 2012-06-01 8:12 pm

Hey guys, since you are at it, I need some constructive criticism. Do you see anything I should have done differently apart from twisting the output cables and the power cable of the SMPS as Audioschipper pointed out? Should I also twist the mains and the aux power (to the button led) cables?

I have some very low power humming when I put my ear 5cm from the speaker, is that to be expected or is it the untwisted cables.
Thanks!

OllBoll · 2012-06-01 8:15 pm

sherlockth said:
Hey guys, since you are at it, I need some constructive criticism. Do you see anything I should have done differently apart from twisting the output cables and the power cable of the SMPS as Audioschipper pointed out? Should I also twist the mains and the aux power (to the button led) cables?

I have some very low power humming when I put my ear 5cm from the speaker, is that to be expected or is it the untwisted cables.
Thanks!

If I remember correctly the speaker outputs on the NCore should ideally not be on opposite sides. I think Bruno taked about the inductor introducing unnecessary noise into output if that was done.

sherlockth · 2012-06-01 8:26 pm

OllBoll said:
If I remember correctly the speaker outputs on the NCore should ideally not be on opposite sides. I think Bruno taked about the inductor introducing unnecessary noise into output if that was done.

Oh, ok I didn't remember that, thanks!

waltzingbear · 2012-06-01 9:00 pm

sherlockth said:
Should I also twist the mains and the aux power (to the button led) cables?

I have some very low power humming when I put my ear 5cm from the speaker, is that to be expected or is it the untwisted cables.
Thanks!

the aux power is dc and twisting is not needed.

mains AC to the switch? twisted with opposite leg yes.

None of this should make a difference in audible hum level. Unplug the audio feeds to the amp, still humming? then there is an assembly error somewhere. No hum? Ground loop in the system.

Alan Garren

souldriver · 2012-06-01 9:15 pm

Stig,

IT WORKS!!!!! you had right...it was the speaker connectors. What a sound...! Thanks a lot!!
Nice to have you guys here.
Thanks again!!!

63781 · 2012-06-01 9:20 pm

Good! I guess its a bit louder now....

emailtim · 2012-06-01 9:36 pm

StigErik said:
Good! I guess its a bit louder now....

What does that do to the hardware when you short the 2 speaker cables together and to ground (besides spark) ???

Thanks,
Tim

OllBoll · 2012-06-01 9:38 pm

emailtim said:
What does that do to the hardware when you short the 2 speaker cables together and to ground (besides spark) ???

Thanks,
Tim

If I remember correctly the awesome chip on the NCore shuts the amp off, which I think Stig indirectly tested earlier in the thread and told us about how it didn't burn off the short where a more "hardcore" amp would have

63781 · 2012-06-01 9:41 pm

Yes, I did test this... by accident.
The amp does not shut off, you just hit the output current limiter.

emailtim · 2012-06-01 9:41 pm

OllBoll said:
If I remember correctly the awesome chip on the NCore shuts the amp off, which I think Stig indirectly tested earlier in the thread and told us about how it didn't burn off the short where a more "hardcore" amp would have

Good to know. I have inadvertently did some arc welding in the past (and it wasn't in my garage

).

sherlockth · 2012-06-01 11:09 pm

waltzingbear said:
the aux power is dc and twisting is not needed.

mains AC to the switch? twisted with opposite leg yes.

None of this should make a difference in audible hum level. Unplug the audio feeds to the amp, still humming? then there is an assembly error somewhere. No hum? Ground loop in the system.

Alan Garren

Thanks Alan, I will try that tomorrow. Please excuse my ignorance, but what do you mean "..with opposite leg"?

pos · 2012-06-02 7:19 am

here is the proper way:

Bruno Putzeys said:
do twist the speaker wiring and PLEASE do not have them come out of the opposing sides of the screw lugs. This makes a big pickup loop right next to the output inductor.

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