The shielding and grounding is there for a reason- different utilization may have different requirements, but the isolation is improved with grounding of shields etc.
Grounding
My trannies have no pins for grounding the internal sheilds... And, I would ask, grounding the sheilds to what exactly: signal ground (which is power supply 0 VDC), AC ground, or just chassis, or all three... Hypex recommends sheilds to chassis, which does connect power supply 0VDC to chassis, and then floating the AC ground, of course, here at DIYaudio.com no one ever floats the AC ground as this is too dangerous...
BTW, just tried julf's suggestion, just transformer in-out +/- with no sheild/ground connections at all. Result=hum...
My trannies have no pins for grounding the internal sheilds... And, I would ask, grounding the sheilds to what exactly: signal ground (which is power supply 0 VDC), AC ground, or just chassis, or all three... Hypex recommends sheilds to chassis, which does connect power supply 0VDC to chassis, and then floating the AC ground, of course, here at DIYaudio.com no one ever floats the AC ground as this is too dangerous...
BTW, just tried julf's suggestion, just transformer in-out +/- with no sheild/ground connections at all. Result=hum...
That was my feeling too. Once curiosity bites, there is no way around trying it out. Regarding the warmth and body to the sound, another approach is to consider going with a linear PS instead. I haven't tested it on ncore, but on UcD HG with HxR where I have tried both linear and Hypex SMPS, my conclusion is that they do sound different. Each have their strengths, but if body and warmth (and a tad more forgivingness/looseness/bounce) is what you want more of than what you get from your nc400/smps600 build, then linear might be more to your taste...
cheers,
I'm responding to julf- on transformers that are equipped with grounded features, his comments don't apply.
Has anyone seen the new NC500 OEM, reserved for OEM producers.
I wonder how it compares to the diy NC400 and the top dog NC1200
Available in 6 weeks.
I wonder how it compares to the diy NC400 and the top dog NC1200
Available in 6 weeks.
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Interesting. NC500 seems to bridge NC1200 with UcD400. UcD400 layout/print size which makes it a direct slot in replacement/upgrade for vendors who already invested their R&D in UcD400. It has NC1200 Voltage compatibility but NC400 Current capability. Makes a lot of sense for OEM since they can just stock SMPS1200A700 supplies using one per two NC500s in stereo builds (for customers with decently effective speakers) and use one smps per NC1200 in mono builds for customers who want (but probably won't actually 'need') the extra current capacity. Let's see whether it drives the commercial ncore prices down to a level where more can afford it 🙂
I have asked Hypex, but does anyone know how these interface with the DLCP?
All the non-OEM stuff has pre-made cables, making life very easy.
All the non-OEM stuff has pre-made cables, making life very easy.
The NC500 has no input buffer.
So will require a gain stage to interface with the DLCP.
So will require a gain stage to interface with the DLCP.
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Assuming you have an OEM agreement with Hypex, I'm sure they can also supply an input buffer for those NC500 modules.
Thanks Julf. I will try again again using isolated ground connection on the trannies, and both components at the same G potential through the AC ground connection chassis/pin 1.
At one point there was some discussion about providing a Y PSU cable to power two nc400 modules with one SMPS600, as initially intended.
It looks like it fell short, and I am currently using only two of my four nc400 modules because of that. All my pitiful attempts at soldering the Y cables myself failed miserably (yes, I know, I am terrible...).
It also looks like even the normal cable cannot be purchased from the web shop, so there is limited room for failure... :/
So, could you recommend someone that could "build" these cables for me, for a fee?
It looks like it fell short, and I am currently using only two of my four nc400 modules because of that. All my pitiful attempts at soldering the Y cables myself failed miserably (yes, I know, I am terrible...).
It also looks like even the normal cable cannot be purchased from the web shop, so there is limited room for failure... :/
So, could you recommend someone that could "build" these cables for me, for a fee?
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That is what I did during my tests
But I'd like to have a beefier/cleaner cable. That solution takes too much space in my enclosure.
I was also afraid of any problems the "spreading" of the power cable could bring (interferences?...).
But I'd like to have a beefier/cleaner cable. That solution takes too much space in my enclosure.
I was also afraid of any problems the "spreading" of the power cable could bring (interferences?...).
I was thinking about contacting James Romeyn here:
- James Romeyn
He probably also has a bunch of spare half cables at hand...
- James Romeyn
He probably also has a bunch of spare half cables at hand...
That is really only an issue with the input and output cables. If you want to properly twist the power supply cables, you have a difficult decision - do you twist them pairwise + with earth and - with earth, or do you twist the + and - together, and run a straight earth, or do you try some 3-way twisting scheme?
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