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NCORE MP Build using Ghentaudio Kit.

Koeitje

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Is that really the way people DIY this stuff? Seems like a waste of all the nice connections.
 

Matias

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Blame them for not selling the modules to DIY market directly...
 

mika91

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Yes, I don't need a trigger, I'm searching a way to avoid pops and clicks so, if You have tried a logic that sequences mute-power on-mute-power off without success, the only way I know is to add a speaker protection circuit that disconnects speakers before power off and reconnects it after power on. The only thing that makes me puzzled is the declaration of Rouge audio and Kjfaudio of pop free power on and off with the control logic.

I built my nc122mp with ghent audio case last week, and I planned to add a 12V trigger to use standby feature and avoid pop/click on power off.
So it seems that even with mute/standby behavior the pop remains ?

EDIT: is using an audio speaker protection kit an acceptable solution (= no sound degradation)?
Something like this, with quality omron relay ?
Not sure how to get AC12-18V to power the module...

Maybe this one, with 220V input ?

Or add this speaker protection in an external case?
 
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sfabio

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I built my nc122mp with ghent audio case last week, and I planned to add a 12V trigger to use standby feature and avoid pop/click on power off.
So it seems that even with mute/standby behavior the pop remains ?
The only solution is to let the amp main spms always on ?

I think that if Red_Baron have tried to sequence mute-power on-mute-power off without results, its better to buy an antibump circuit like this
 

mika91

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I think that if Red_Baron have tried to sequence mute-power on-mute-power off without results, its better to buy an antibump circuit like this

Ok, if it has no sound quality impact, it should be the way to go.
Not sure how to integrate it however (inside the amp? in an external case?)
 

mika91

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I think that if Red_Baron have tried to sequence mute-power on-mute-power off without results, its better to buy an antibump circuit like this
I confirm.
I made some tests this morning, and use standby mode don't resolve the "plop" sound.
If the preamp is on, the plop is quieter than if the pream if off. But stills plop

Very disappointed
 
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sfabio

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I confirm.
I made some tests this morning, and use standby mode don't resolve the "plop" sound.
If the preamp is on, the plop is quieter than if the pream if off. But stills plop

Very disappointed
Have You tried with a circuit that correctly implements startup sequence or simply with switches on standby and mute pins? I've no time to test these days :(
 

mika91

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Only manual switch on standby pin J6.3 to J6.9
I don't have the material nor the knowledge to test a startup sequence. ^^
 

mika91

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Maybe I could test a startup sequence with an Arduino board, but don't have one
 

mika91

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According to this ncore amplifier specifications, it has a microcontroller, "Muted start-up process for pop free operation" and "DC detection and protection".

So a startup sequence with combination of mute and standby pins should work
 

Matias

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Maybe the DC on the mains is causing the pop?
 

Julf

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mika91

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Inputs open, or shorted?
I think I tried with and without XLR wires plugged. (will do the test again later)
I hope that was what you mean by "open or shorted"
 
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Julf

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I think I tried with and without XLR wiree plugged. (will do the test again later)
I hope that was what you mean by "open or shorted"

By "shorted" I actually mean exactly that - the inverting and non-inverting input connected to each other.
 

Matias

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no preamp plugged to the ncore => "pop" on both power on/off
Ok, but I meant DC on the mains. You can test with a multimeter between phase and neutral and check. Maybe this is causing the shutdown pop.
 

Julf

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Ok, but I meant DC on the mains. You can test with a multimeter between phase and neutral and check. Maybe this is causing the shutdown pop.

Not sure how mains DC would cause a pop - the power supply should eliminate the DC.
 

mika91

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ok, so I did some tests again with the amplifier:

- no XLR cables plugged, internal XLR input connector unplugged -> pop on power off
- no XLR cables plugged, internal XLR connector plugged -> pop on power off
- XLR cables plugged only (no preamp) ->pop on power off
- XLR plugged + pream standby ->pop on power off , sometimes on power on
- XLR plugged + preamp on + no active source -> pop on power off
- XLR plugged + preamp on + active source-> pop on power off

So whatever the configuration, I still have the "pop" on power off.
It could be quiet or louder, not always the same sound level (true for all configurations)

Tried to plug AC on different outlets, same result.
Multi-meter gives me around -10mV DC on the AC mains, not sure it's relevant.
 
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Matias

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Yes, DC is low enough. Seems like it is something the boards indeed.
Just leave them always on. Problem solved. :)
 
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