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Class D Switching Power Amplifiers and Power D/A conversion

Hypex Ncore NC400 - input anti-alias filter?
Hypex Ncore NC400 - input anti-alias filter?
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Old 19th April 2018, 09:14 PM   #11
diyaudnut is offline diyaudnut  United States
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This connector to the AMPs should help
NC3MXX-EMC - Neutrik

I am not sure about any RFI at the AMP input inside the chassis with one or more SMPS.
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Old 19th April 2018, 09:17 PM   #12
diyaudnut is offline diyaudnut  United States
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Quote:
Originally Posted by diyaudnut View Post
This connector to the AMPs should help
NC3MXX-EMC - Neutrik

I am not sure about any RFI at the AMP input inside the chassis with one or more SMPS.
Ehh… correcting myself….

These are not on the signal lines, so doesn’t help with RF inputs on them. Sorry.
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Old 20th April 2018, 08:55 AM   #13
PMA is offline PMA  Europe
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I have not received a reply from Hypex technical support, but in an e-mail communication, B.P. has confirmed my findings and also confirmed that the most sensitive frequency range is near to 2 x switching frequency. So, for those who are interested, a decent LPF at the amplifier input should cure the issue.
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Old 21st April 2018, 01:05 PM   #14
TNT is offline TNT  Sweden
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PMA, would you have a suggestion for such a filter?

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Old 21st April 2018, 01:42 PM   #15
ds23man is offline ds23man  Netherlands
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Or use a proper source with correct outputfiltering........
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Old 21st April 2018, 01:44 PM   #16
TNT is offline TNT  Sweden
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A unit with a "flaw" should protect itself. Being wideband is not an error.

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Old 21st April 2018, 02:20 PM   #17
ds23man is offline ds23man  Netherlands
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Does it blow up? No

But seriously, 21 mV at 960Khz is not a normal situation.
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Old 21st April 2018, 06:10 PM   #18
Reactance is offline Reactance  South Africa
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Originally Posted by pieter t View Post
listening fatigue
hahaha!
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Old 28th April 2018, 12:13 AM   #19
NielsMayer is offline NielsMayer
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If one were to emulate the equivalent of using an XLR male connector like "Neutrik-NC3FXX-EMC blocking XLR Male" on the input to the NC400 based amp -- what circuit, inductor or capacitor values and materials (e.g. ceramic cap) would you recommend?

Adding a capacitor, a ferrite, and AC-coupling the shield is what is being done in the Neutric RF-blocking connector: Neutrik NC3FXX-EMCB Cable Connector (Black) | NZ

Is there any reason why the same circuitry can't be added to the XLR female jack for the amplifier input -- instead of building a special RF-blocking preamp/DAC -> nc400 amplifier cable with aforementioned Neutrik connector.

Thanks,
- Niels.
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Old 28th April 2018, 01:07 AM   #20
NielsMayer is offline NielsMayer
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Originally Posted by NielsMayer View Post
If one were to emulate the equivalent of using an XLR male connector like "Neutrik-NC3FXX-EMC blocking XLR Male" on the input to the NC400 based amp -- what circuit,
- Niels.
Should have taken a closer look at NC3MXX-EMC - Neutrik for the circuit:

Click the image to open in full size.

TBD: inductor and capacitor values?
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