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Class D Switching Power Amplifiers and Power D/A conversion

Hypex Ncore
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Old 8th September 2012, 06:40 PM   #5041
cab is offline cab
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Join Date: Aug 2009
couldn't you use the two existing connectors, wire them to one side of a terminal block, then wire the power in to the other side of the terminal block? You wouldn't need to make any cables and can use the ones you have.
Old 8th September 2012, 07:05 PM   #5042
PassingThrough is offline PassingThrough
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Thanks cab, I checked out some 12 pin terminal blocks online just after posting and I do think that would be a good option.

Space is a bit tight in my enclosure so I'm going to go a different route though as I just dropped by the local Radio Shack and found some small metal butt connectors that will let me Y each of the wires together to connect to the SMPS600 wires (after cutting off one of the unneeded molex connectors). I'll crimp them with a bit of solder inside and then apply heat and then some heat shrink insulation. Should make for a solid connection.

Fun stuff.
Old 8th September 2012, 07:44 PM   #5043
cab is offline cab
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Why cut off the molex connectors? Couldn't you just splice each corresponding wire together and to a wire that would go to the inlet? Or why not just connect each of them to the inlet? They are only 18 gauge- I would bet you could solder them both to the inlet...
Old 8th September 2012, 08:13 PM   #5044
PassingThrough is offline PassingThrough
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If I understand you, you're saying keep both molex connectors on the SMPS600 cable and connect the wires from the two NC400's into the pin side of one of those connectors.

The wires are 20 gauge and even a single wire won't fit into that side of the molex connector. The pins that the molex connects to on the NC400 and SMPS600 are smaller than 20 gauge.

So I think the only way to do this, whether splicing each wire in a Y as I plan to do or using a terminal block, is to remove one of the two molex connectors on the cable that comes with the SMPS600.
Old 8th September 2012, 08:19 PM   #5045
cab is offline cab
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sorry, I thought you meant mains power when you said power....
Old 9th September 2012, 12:56 AM   #5046
Bill13 is offline Bill13  United States
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Default Homemade Y-cable for one SMPS600 & adding heat sinking

When I made a Y-cable, I cut supplied cable in two, and used heat shrink after soldering the wire-splices - using heat shrink gave me more confidence to avoid shorts, but IMO making this Y took too much time to complete -wish Hypex had made a factory Y cable available.

BTW, I have two stereo sets of Ncore amp modules. Did not hear much SQ difference, if any, between powering a stereo pair with two SMPS600 (individual SMPS for each ncore amp module), and another ncore pair powered by only one SMPS600 with my homemade Y-connector cable.

IMO, SMPS600 aluminum heatsink (the one close to the big electrolytic filter caps) gets uncomforably hot after about half an hour or so, especially when one SMPS600 powers two ncore modules using the homemade Y-adapter - even when ncores are idle = not playing music.
Having a SMPS600 heat sink get hot & located immediately next to electrolytic caps is not very good, long term, I believe ...

Not sure it's a good idea, but I got the SMPS600 heat sink to run much cooler by placing 3 pieces of 1" wide x 1/8 thick aluminum bar stock on top of the heat sink. This add-on heat aluminum sinking is just thick enough to be in in contact with the enclosure/case top which is also made of aluminum, but maybe there's potential electrical isolation/noise issues? As far as I can tell, the Ncores still seem to work OK with this heat-sinked SMPS600 -- and so far there's no perceived hissing, noise, etc.
Old 9th September 2012, 02:06 AM   #5047
PassingThrough is offline PassingThrough
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Join Date: Aug 2012

Thanks a lot for the info. I knew there should be no sound quality difference just because another NC400 pulls power off the same line and Bruno has confirmed this, but it's good to hear your results nonetheless.

I hadn't thought about the possible higher running temperature of the SMPS600 though -- that warning is much appreciated. I just now ordered a 3.5" x 1.1" aluminum heatsink (about 1 inch tall with fins) to fit the top of that existing flat heatsink on the SMPS600.
Old 9th September 2012, 12:31 PM   #5048
OllBoll is offline OllBoll  Sweden
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I also did my Y-cable by splitting the cable.

In my boxes I had one normal cable and then another cable with only one side, so I split the normal one and then soldered all the small cable into Y's and applied heat shrinked pipes.

Keep in mind though that many of the cables are the same, so you don't need to do this for all of them but you can combine the cables by color.
Old 10th September 2012, 07:00 PM   #5049
BigE is offline BigE  Canada
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Has anyone compared the NC-400 with Wyred 4 sound products?
Old 11th September 2012, 02:33 AM   #5050
Audioschipper is offline Audioschipper  Netherlands
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Originally Posted by BigE View Post
Has anyone compared the NC-400 with Wyred 4 sound products?
Maybe Cliff Richard?

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