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Hypex NC1200: Quality of the implementations

piebia

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https://www.audiosciencereview.com/forum/index.php?threads/diy-purifi-amp-builds.10478/post-323538

Clean AUX power, better than from Hypex SMPS.

https://www.audiosciencereview.com/...io-class-d-amp-build-quality.7717/post-182097

[ ...In attachment you can also find pictures of our new amazing product. It is called the PNC1200M mono blocks. PNC stands for Premium Ncore. These mono blocks are based around the NC1200 modules. We use Weiss OP2-BP op amps for the input buffer and a linear power supply for the input buffer stage and modulator stage... ]
I've additional questions:

1 why add a backend buffer? As far as I know mola mola mono works without it so what is the advantage?
2 without buffer additional is lps used only for standby purposes? (pin1and 2 for standby ,35,7 output and ground and 4 and 6 unused
3do you think that standby lps can impact on sonic performances?

Thanks
Pit
 

Matias

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I've additional questions:

1 why add a backend buffer? As far as I know mola mola mono works without it so what is the advantage?
2 without buffer additional is lps used only for standby purposes? (pin1and 2 for standby ,35,7 output and ground and 4 and 6 unused
3do you think that standby lps can impact on sonic performances?

Thanks
Pit
1. Because it is necessary on the OEM modules. Mola Mola uses what looks like a custom version of the NC1200 module with onboard buffer.
Also notice the lack of connector for the speaker wires on the custom board, instead the wires are directly soldered into the board.
 
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maty

maty

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2 and 3, I do not have / know the answers.
 

piebia

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1. Because it is necessary on the OEM modules. Mola Mola uses what looks like a custom version of the NC1200 module with onboard buffer.
Also notice the lack of connector for the speaker wires on the custom board, instead the wires are directly soldered into the board.
So they are really different to purify which is sold with an input output buffer?
 

mocenigo

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So they are really different to purify which is sold with an input output buffer?

The 1ET400A modules do not have an input buffer. The EVAL1 kit includes a connection board that also provides bypassable buffers. No output buffer AFAIK is available nor needed.
 

boXem

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1. Because it is necessary on the OEM modules. Mola Mola uses what looks like a custom version of the NC1200 module with onboard buffer.
Also notice the lack of connector for the speaker wires on the custom board, instead the wires are directly soldered into the board.
OEM modules also have the input buffer embedded, with the option to deactivate it (solder jumper) and use an external buffer in order to "differentiate" your product.
 

March Audio

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Sacrilegious, you have directly or indirectly criticized Bruno Putzeys. Someone will call your attention and ask to be banned from the forum. :eek:
Erm that was sarcasm :facepalm:

No, it's only individuals that continually post misinformed and inacurate information that should be banned.
 
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March Audio

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Nope, it seems to be there for the standby function. Look how things are connected, you can see all the wires.

As for the Hypex SMPS, which we have already proved to have some interesting design aspects, the use of the 7815/7915 as regulators is not too bad, provided the circuits downstream have sufficient PSRR. You can have cleaner power with other circuits (and again Sparkos is mostly marketing - if used properly the Hypex regulator is even better, and if one uses the LT3045/LT3094 one gets similar purity with a smaller expense, and in fact Apollon will move to the LT3045/LT3094) but it may or NOT be necessary. I am using external AUX power with my build only because the one of the Connex SMPS is not suitable.
I use LT regs. Excellent high frequency rejection which is where normal regs are not good. Relevant for smps switching frequency.
 
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March Audio

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https://www.audiosciencereview.com/forum/index.php?threads/diy-purifi-amp-builds.10478/post-323538

Clean AUX power, better than from Hypex SMPS.

https://www.audiosciencereview.com/...io-class-d-amp-build-quality.7717/post-182097

[ ...In attachment you can also find pictures of our new amazing product. It is called the PNC1200M mono blocks. PNC stands for Premium Ncore. These mono blocks are based around the NC1200 modules. We use Weiss OP2-BP op amps for the input buffer and a linear power supply for the input buffer stage and modulator stage... ]
Wrong. Standby control.
 

March Audio

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I only rely on independent measurements and subjective reviews from certain people I have confidence in.

After the appearance of PURIFI 1ET400A I lost the little interest I had for Hypex, Pascal, ICEpower...

And no interest in Hypex SMPS.
Unfortunately you have repeatedly demonstrated that you don't understand the technical info you read and sighted uncontrolled subjective reviews are total waste of time.
 
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maty

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Incredible bad implementation. From an US "enterprise". :mad:

There [are] a lot of pictures, with details.

VTV Amplifier - Terrible Quality Build and Customer Service
https://www.audiosciencereview.com/...ble-quality-build-and-customer-service.15220/

index.php


index.php
 
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Valhalla

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this is our humble nc1200 monos for Iran local market. nothing remarkable, everything is Hypex nothing else. the chassis is machined out of a single piece of 7075 aluminum billet. Hard anodized finish. it's probably the most affordable ever cause Iran is a poor hellhole with low currency value. :-(

IMG_6717.jpgIMG_6022.JPGIMG_6032.JPG
 

Feyire

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this is our humble nc1200 monos for Iran local market. nothing remarkable, everything is Hypex nothing else. the chassis is machined out of a single piece of 7075 aluminum billet. Hard anodized finish. it's probably the most affordable ever cause Iran is a poor hellhole with low currency value. :-(

Visually, the case looks quite nice on the exterior.

However, I'm not a fan of the interior cable routing, because a lot of the cables pass directly above (or in very close proximity) to the inductors on the amplifier module and SMPS module.
 

Matias

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Agreed, also don't forget to twist the speaker cables before the connector. Cool case though.
 

VintageFlanker

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this is our humble nc1200 monos for Iran local market. nothing remarkable, everything is Hypex nothing else. the chassis is machined out of a single piece of 7075 aluminum billet. Hard anodized finish. it's probably the most affordable ever cause Iran is a poor hellhole with low currency value. :-(

Very very cool industrial design. Love it.

I second what has been said above, just a bit more effort on cable management and it will be perfect.;)
 

onix

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this is our humble nc1200 monos for Iran local market. nothing remarkable, everything is Hypex nothing else. the chassis is machined out of a single piece of 7075 aluminum billet. Hard anodized finish. it's probably the most affordable ever cause Iran is a poor hellhole with low currency value. :-(


Tell us about the technical design considerations, if you care to share. Beyond twisted-pair advice to reduce cross coupling, we could make other suggestions. For example, what consideration did you make for cooling? Or mechanical vibration reduction? Adjustment to reduce power fluctuations, etc. Maybe this could be the first community-source build for the Hypex :)
 

Valhalla

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Tell us about the technical design considerations, if you care to share. Beyond twisted-pair advice to reduce cross coupling, we could make other suggestions. For example, what consideration did you make for cooling? Or mechanical vibration reduction? Adjustment to reduce power fluctuations, etc. Maybe this could be the first community-source build for the Hypex :)

Actually the whole chassis act as a big heat sink as we install the modules up-side-down and the heat tends to go up. we also pervent contact sections (between modules aluminum plates and chassis) from getting hard-anodized for better heat conductivity. cooling capability if far more than adequate. Hard anodizing process makes a think layer of ceramic-like surface with 70 Rockwell hardness. It's almost unscratchable.
 

boXem

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Actually the whole chassis act as a big heat sink as we install the modules up-side-down and the heat tends to go up. we also pervent contact sections (between modules aluminum plates and chassis) from getting hard-anodized for better heat conductivity. cooling capability if far more than adequate. Hard anodizing process makes a think layer of ceramic-like surface with 70 Rockwell hardness. It's almost unscratchable.
That's a pretty good start. The coils in both the SMPS and the Ncore are also heating a lot. How do you deal with this?
 

onix

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Actually the whole chassis act as a big heat sink as we install the modules up-side-down and the heat tends to go up. we also pervent contact sections (between modules aluminum plates and chassis) from getting hard-anodized for better heat conductivity. cooling capability if far more than adequate. Hard anodizing process makes a think layer of ceramic-like surface with 70 Rockwell hardness. It's almost unscratchable.

Another couple of considerations are vent holes at the bottom, and inlayed copper heat spreaders. Convection from the heating will draw the air from the bottom out holes on the top. Either way, it would be worthwhile to use a thermocouple to measure the temperature on the top of the power chips to see what temperature they achieve under max draw. Your design looks like it restricts heat flow.

Have you done any measurements on the cross coupling of signals between lines? Wiremesh cable routing shields terminated to the chassis ground around the twisted pairs might help, but you really need to measure the coupling to see if it is worthwhile, and then if shielding is applied, to see how much improvement you have gotten. It's never worthwhile to over-design.
 
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