Ahh!
I´ll have to explain better.
The power cord was first placed at the counter, where fuses, HFI relays and so on are placed, then connected to the cable that later on should be fixed in the wall, which it was not yet. And it was impossible to detect whether that power cord was there or not.
Then the power cords was fixed as it was supposed to, ind the IEC socket of the amplifier. Now it could be detected.
So if the power cords is placed away from the amps, you won´t hear them, but placed in the closest vicinity of the amps you will.
This leads to suspetion that electronic gear with their transformers influences each other through these power cords, which is actually of course they do.
So much of the fuz about these cords, comes down to this.
One could ad PFC to every single unit, but I think that might be even worse in the end.
Btw. I did not say that the power cords were expensive or nice at all, just that they could be recognized, which I do not have any opinion on.
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There are quite a few IEC input panels (Corcom is a common and good brand) that are specifically designed for this, and as a bonus, they can remove the serious amounts of hash caused by the CFL lamps mandated by our Besserwissers. It's most common with switching supplies, but I've experienced the issue with mercury vapor rectifiers, too.
Can you define "detected" in the context you use this? Your description suggests that there were all sorts of visual cues.
It is this? Tyco Electronics - 15EEJ1 - Allied Electronics
I've never seen one of these on a power supply. So, I tried to guess from your description that it might be Corcom / Tyco part# 15EEJ1. Is that right?
That's one, yes. They come in all sizes, shapes, and filter contents so that one can be chosen optimally for a specific use. The whole PEM thing is amazingly convenient and performs well- I shouldn't therefor be surprised if they are frowned upon by the high end hair-shirts.
Tougher cases may require a discrete version, but in those cases, looking at the fundamental cause (a bad supply design) might be more fruitful.
Tougher cases may require a discrete version, but in those cases, looking at the fundamental cause (a bad supply design) might be more fruitful.
Good old Tyco!
Those filters like that do work well, but sometimes you need to be careful with them. I can't say for that filter, but I've done spectrum analysis on one that did a much better job keeping noise IN than keeping it out. So you would need to be a bit careful.
Those filters like that do work well, but sometimes you need to be careful with them. I can't say for that filter, but I've done spectrum analysis on one that did a much better job keeping noise IN than keeping it out. So you would need to be a bit careful.
Indeed, rdf, that was my point- if there's something in your system sending hash back down the power line, the PEM is a logical place to stop that.
Kurt von Kubik
Here is a thread you may find interesting to delve into. most especially this last post.
http://www.diyaudio.com/forums/parts/102180-groundside-electrons-30.html#post1949514
Bud
Here is a thread you may find interesting to delve into. most especially this last post.
http://www.diyaudio.com/forums/parts/102180-groundside-electrons-30.html#post1949514
Bud
danielwritesbac
You might find learning how to apply EnABL processes to speakers of all sorts both entertaining and useful. The differences in propagation vs frequency response become a moot point.
I have posted a txt file showing most of the threads devoted to this subject.
Bud
You might find learning how to apply EnABL processes to speakers of all sorts both entertaining and useful. The differences in propagation vs frequency response become a moot point.
I have posted a txt file showing most of the threads devoted to this subject.
Bud
danielwritesbac,
In my case,only thing connected on the dedicated power line is my audio system.Here,we use three wires(separate earth).The house wiring has been bypassed completely.I don't think that anyone can give any reason why this power line is not better.No refrigerators,washing machines,TV sets,dryers,nothing.Just 4.5 m of 3-wire,shielded,12awg cable,no PVC either.No need for filters,and my amp's PSU is just fine.
Is anyone who could get away with a dedicated 4.5m power line for his audio system and wouldn't do it?Please tell me WHY ?
In my case,only thing connected on the dedicated power line is my audio system.Here,we use three wires(separate earth).The house wiring has been bypassed completely.I don't think that anyone can give any reason why this power line is not better.No refrigerators,washing machines,TV sets,dryers,nothing.Just 4.5 m of 3-wire,shielded,12awg cable,no PVC either.No need for filters,and my amp's PSU is just fine.
Is anyone who could get away with a dedicated 4.5m power line for his audio system and wouldn't do it?Please tell me WHY ?
Speaking of hash back down the line, I wonder if there isn't a way to avoid connecting the hash coming back down the speaker return line straight on into the inverting input? As far as answers go, I'm not convinced about a "ground lift" resistor being quite good enough to stop powerful noise--this still looks insufficient. Its a common and generally accepted design in the majority of amplifiers, thus the practice must be perfectly fine right? So, why does it look so very misgiven, like it will cause slightly out-of-sync compression?
I think that I like the idea of a bridge amp, whereby the speaker has equal and opposite, with the small signal ground at centerpoint. In any case, the circuit looks more reasonable when the speaker return doesn't attach directly to the small signal area. Any ideas on that one?
Other thoughts: Playing with "audio ramjet preamp" despite the fact that its supposed to rain. Gosh I wish I hadn't blown the center cap off the roof again. Its landed in the back yard. Typical. 🙂
How do you keep your grounds seperate? In N.A. its required to tie all grounds and neutrals at the breaker panel and conect them to a ground rod. (or risk electrocution or fire)
To be honest, noise going down the speaker return line has never caused a problem in any of my systems. As long as the amp is designed competently, the speaker cables aren't bizarrely long, the system is not set up near a high power transmitter, and the grounding internal to the amplifier is done correctly (all easy things to do for 99.99% of us), this is a non-issue.
Power line noise? That's an issue, but again, one that's easily dealt with using boring, conventional engineering.
Power line noise? That's an issue, but again, one that's easily dealt with using boring, conventional engineering.
Our mains here is the same as in UK(230/240 volts/3-wire).The ground is connected at the main panel and then to a ground rod.It is separated from neutral.
The shield from the dedicated line is attached to the ground only at the main panel side.
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So the neutral and ground arnt connected at the panel or are they? I would assume they are or there will be safety issues.
I guess the point is; to achieve what youv done all you need to do is make sure only your audio gear is running of a breaker.(so that breaker cct only feeds your audio gear )
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