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Old 22nd December 2011, 08:50 AM   #971
tiki is offline tiki  Germany
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OK Bruno,
foolish question, I could have known before, that you checked the noise by yourself.
Thanks again for sharing some background with us. I'm so curious!
I suppose, some of the LEDs are connected in series? Then the noise voltage should not increase as much as the voltage fortunately, unlike the most of the voltage references with different output voltages.

Cheers, Timo
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Last edited by tiki; 22nd December 2011 at 08:53 AM.
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Old 22nd December 2011, 08:57 AM   #972
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Can we see a step response of a Ncore1200 ? Can we see that on a reactive load which imitation a real loudspeaker ?
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Old 22nd December 2011, 09:07 AM   #973
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@Julf, Like all things American, the Christmas lights craze is picking up here as well. Luminous reindeer, the lot.

@StigErik: Correct. The SMPS180 design didn't scale well. Regulation isn't needed for sonic reasons but it does help make power ratings consistent.

@atoluma: Ideally, unclipped output power is (HV^2)/(2*R). On the grounds of minimum duty cycle the NC400 reaches clip (arbitrarily defined as the point where THD shoots past 1%) at around 93% of rail voltage so the more realistic formula is 0.87*(HV^2)/(2*R). So the 400W figure is obtained at a loaded supply voltage of around 60.5V. The range above 60.5V is headroom needed for the worst-case conditions of no load and mains overvoltage. Of course, if you design your supply for local mains conditions only you could easily get well past 400W.

@greierasul
I've now got some other work on the table but I might add a square wave plot to the data sheet at some point. Not that I think square wave responses mean anything. The frequency response tells you everything you need to predict the square wave response. Which is to say, most of it will just stay rock solid regardless of the load impedance, and some loads will cause a smallish bit of ringing around 60kHz.
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Last edited by Bruno Putzeys; 22nd December 2011 at 09:15 AM.
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Old 22nd December 2011, 09:28 AM   #974
tiki is offline tiki  Germany
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Hello,
Quote:
Originally Posted by Bruno Putzeys View Post
Zaph Audio tested a few B&G units and considers them the only good ribbons (seriously good at that).
only the Neo3 PDR if I'm right. Erik uses the '75, as well as I did. This little guy behaves "different".
My BGs do not like this spectrum (momentary "shot" as PDF). Try these:
http://www.ibtk.de/project/speaker/m...s2-10_60db.wav
http://www.ibtk.de/project/speaker/m...s2-10_70db.wav

But Eriks BGs seem to be much better, as he told me.

The Alcons seem to perform much better. Michael Makarski measured the SLS magnetostats and told me, that these seem to be the best. I believe that, after having some Emails with Igor Levitsky, the developer two years ago. Unfortunately Alcons and SLS do sell to OEMs only and I couldn't become one.

Cheers, Timo
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Old 22nd December 2011, 09:34 AM   #975
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One tech question: Where is the best place to connect the nAMPON wire? At the PSU ground?

Have I made a fool of myself connecting this to the signal ground at my XLR input connector?
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Old 22nd December 2011, 09:44 AM   #976
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I take it you've connected nAMPON to pin 1 of your XLR. That is fine.

The module has neither signal ground nor power ground. All pins actually marked as GND go straight into the copper plane. Any of those will do.
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Old 22nd December 2011, 10:27 AM   #977
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Apologies if this has been covered before but I have a couple of UCD400 based monoblocs with +/- 65V linear supplies, can I drop in the N-Core modules or do I need a low voltage supply for the driver (op-amp) stage(s)?

Thanks
Simon
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Old 22nd December 2011, 10:31 AM   #978
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You do indeed need the small signal supply, unregulated, 15V and up.
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Old 22nd December 2011, 10:36 AM   #979
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Quote:
Originally Posted by Bruno Putzeys View Post
I take it you've connected nAMPON to pin 1 of your XLR. That is fine.
Yes.

And the shield of the signal cable is connected to pin 1 as well.
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Old 22nd December 2011, 11:32 AM   #980
Julf is offline Julf  Europe
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Originally Posted by Bruno Putzeys View Post
@Julf, Like all things American, the Christmas lights craze is picking up here as well. Luminous reindeer, the lot.
Unfortunately I am noticing some of it too. I can tell you that a luminous reindeer and sledge on the balcony of an Amsterdam canal house looks somewhat out of place...

Quote:
The range above 60.5V is headroom needed for the worst-case conditions of no load and mains overvoltage. Of course, if you design your supply for local mains conditions only you could easily get well past 400W.
So here in Amsterdam I should scale the supply voltage down to 50V or so (I am forever changing light bulbs, as the old supply network from the 50's is less than stable but nothing gets replaced until it blows up)
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