Magnetism.
Eric,
Err...blonde?😉
I kinda had forgotten about this resource of yours.Handy!
As Bernhard has pointed out we may just be so lucky as to have some in house knowledge as well.
I'm thinking about Steve Eddy and some other folk.
Fingers crossed,😉
Eric,
Err...blonde?😉
I kinda had forgotten about this resource of yours.Handy!
As Bernhard has pointed out we may just be so lucky as to have some in house knowledge as well.
I'm thinking about Steve Eddy and some other folk.
Fingers crossed,😉
mrfeedback said:
Actually they DON'T become magnetized easily. If they did, they'd be largely worthless as trasnformer cores.
Because of their high permeabilities, they tend to have a much lower saturation point which means that relatively small amounts of DC current can degrade their performance moreso than lower permeability core materials with higher saturation points. But this is a separate issue from magnetization.
The higher permeability materials, while having lower saturation points, are the LEAST easy to magnetize. That's why you don't see MuMetal magnets or Alnico transformer cores.
se
dice45 said:
The higher permeability materials have the least remnance (residual magnetization). That's why their hysteresis curves are so narrow. It's their relatively low saturation points that cause their peformance to degrade in the presence of DC bias currents. Not their residual magnetization.
se
Magnetism.
Yes, she is blonde, as I am and my two little darling boys (6yo+7yo).
She is Danish, and the boys and I are designed in DK, made in AUS. 😉
They went to DK recently for 5 weeks, and now have gone back for 12 months or so, so Anna can take care of her mother who has had a stroke 🙁 , and so the boys can get to know their roots and relatives and a different culture. 🙂
The boys are going to school already, so should come back little Vikings - I probably won't understand a word they say.
She did promise to me that she would come back, so I will likely have an audio shopping list for her by then.
That reminds me my mother is coming over from Brisbane at christmas for a few months with the set of Dynaudio drivers that she bought in DK years ago so that I could build her a nice set of cabinets - she threatens that she won't leave until they are done.
This will be a pleasure of course. 🙂.....building the speakers I mean.
Eric.
fdegrove said:
Yes, she is blonde, as I am and my two little darling boys (6yo+7yo).
She is Danish, and the boys and I are designed in DK, made in AUS. 😉
They went to DK recently for 5 weeks, and now have gone back for 12 months or so, so Anna can take care of her mother who has had a stroke 🙁 , and so the boys can get to know their roots and relatives and a different culture. 🙂
The boys are going to school already, so should come back little Vikings - I probably won't understand a word they say.
She did promise to me that she would come back, so I will likely have an audio shopping list for her by then.
That reminds me my mother is coming over from Brisbane at christmas for a few months with the set of Dynaudio drivers that she bought in DK years ago so that I could build her a nice set of cabinets - she threatens that she won't leave until they are done.
This will be a pleasure of course. 🙂.....building the speakers I mean.
Eric.
Eric,
Anyway you look at it,you better start building those cabs asap.😀
Don't magnetize your mom though.
Those Danes know a thing or two when it comes to designing don't they?
Actually,got some Scandinavian blood in my veines as well (amongst other toxic stuff) from my mother's side of the genealogical tree and proud of it. 😉
Catch you later,🙂
Anyway you look at it,you better start building those cabs asap.😀
Don't magnetize your mom though.
Those Danes know a thing or two when it comes to designing don't they?
Actually,got some Scandinavian blood in my veines as well (amongst other toxic stuff) from my mother's side of the genealogical tree and proud of it. 😉
Catch you later,🙂
Magnetism.
Hello,
While reading pieces of articles on the Densen site regarding this Demagic CD I was wondering if a CD could actually replace the electronic circuitry for demagnetizing things.
I quote from their product:
"Some years ago we discovered that a strong signal from a signal generator through the signal path of an amplifier had a positive effect on the sound. One year later, during which we had experimented with complex signals, we found an algorithm of signals that gave a stunning improvement in soundstage, transparency, details and dynamics of audio systems.
The reason behind this is that small magnets in the signalpath are, with time, orientated in one direction. This produces a detrimental effect on the signal. The DeMagic signal actually relocates the magnets, and thereby breaks the magnetic field and it's negative effect on the sound.
In 1997 the University of Seoul, Korea, made scientific tests that positively proved the Densen theory behind the DeMagic signal, and today the DeMagic is a must for any serious audiophile and musiclover."
Cheers,
🙂
Hello,
While reading pieces of articles on the Densen site regarding this Demagic CD I was wondering if a CD could actually replace the electronic circuitry for demagnetizing things.
I quote from their product:
"Some years ago we discovered that a strong signal from a signal generator through the signal path of an amplifier had a positive effect on the sound. One year later, during which we had experimented with complex signals, we found an algorithm of signals that gave a stunning improvement in soundstage, transparency, details and dynamics of audio systems.
The reason behind this is that small magnets in the signalpath are, with time, orientated in one direction. This produces a detrimental effect on the signal. The DeMagic signal actually relocates the magnets, and thereby breaks the magnetic field and it's negative effect on the sound.
In 1997 the University of Seoul, Korea, made scientific tests that positively proved the Densen theory behind the DeMagic signal, and today the DeMagic is a must for any serious audiophile and musiclover."
Cheers,
🙂
magnetization
Low level magnetization can easily occur and is often audible. Probably mainly due to the assymetric nature of the audio signal itself.
Two words: Hysteresis Loop
http://230nsc1.phy-astr.gsu.edu/hbase/solids/hyst.html
http://230nsc1.phy-astr.gsu.edu/hbase/solids/hyst.html#c2
http://www.dextermag.com/Science_of_Magnets.htm
Fred
Low level magnetization can easily occur and is often audible. Probably mainly due to the assymetric nature of the audio signal itself.
Two words: Hysteresis Loop
http://230nsc1.phy-astr.gsu.edu/hbase/solids/hyst.html
http://230nsc1.phy-astr.gsu.edu/hbase/solids/hyst.html#c2
http://www.dextermag.com/Science_of_Magnets.htm
Fred
mrfeedback said:
If you like. Which, it just occurred to me, would happen just as soon as you removed the DC bias current and started playing some music through it.
se
Eric,
Hope they are all OK?
12 months must be hard on you,I reckon?
Steve,
In conclusion:not to worry then?
Fred,
Sorry,still have to look at the links you posted.Tomorrow,promised.
5.01 am,high time to take a nap and no more Belgian beer in the fridge.
All the best,🙂
Hope they are all OK?
12 months must be hard on you,I reckon?
Steve,
In conclusion:not to worry then?
Fred,
Sorry,still have to look at the links you posted.Tomorrow,promised.
5.01 am,high time to take a nap and no more Belgian beer in the fridge.
All the best,🙂
Re: magnetization
The reason it's audible is because of the non-linear nature relationship between the magnetic field and magnetic flux density in ferromagnetic materials which is what the hysteresis loop is a plot of. Not because of any asymmetrical nature of audio signals.
Because the hysteresis loop is symmetrical, it results in odd ordered distortion products. With a DC bias current in the transformer, this would produce an asymmetry to the picture and shift the distortion from odd ordered to even ordered. Which perhaps explains why I don't mind a little DC bias in my transformers. 🙂
se
Fred Dieckmann said:
Low level magnetization can easily occur and is often audible. Probably mainly due to the assymetric nature of the audio signal itself.
Two words: Hysteresis Loop
The reason it's audible is because of the non-linear nature relationship between the magnetic field and magnetic flux density in ferromagnetic materials which is what the hysteresis loop is a plot of. Not because of any asymmetrical nature of audio signals.
Because the hysteresis loop is symmetrical, it results in odd ordered distortion products. With a DC bias current in the transformer, this would produce an asymmetry to the picture and shift the distortion from odd ordered to even ordered. Which perhaps explains why I don't mind a little DC bias in my transformers. 🙂
se
fdegrove said:
Well, I can't speak for anyone else, but it's not something I lose sleep over. 🙂
se
Thank you very much Steve.
Definitely going to sleep now I dont have to worry anymore.😎
See you,😉
Definitely going to sleep now I dont have to worry anymore.😎
See you,😉
By the way, it's worth mentioning that the effects of hysteresis are frequency dependent and increase as frequency decreases. Which explains why transformer distortion increases as frequency decreases.
se
se
Not because of any asymmetrical nature of audio signals.
I am afraid I can't agree with all these assertions this time but will not go into a debate at this time. I need to dust off a few magnetics text before jumping in to details. I really don't understand the DC and even order distortion theory. Any references? Maybe my education is lacking on this point but I don't remember this one.
For a start on theory:
http://sound.westhost.com/xfmr2.htm
Later,
Fred
I am afraid I can't agree with all these assertions this time but will not go into a debate at this time. I need to dust off a few magnetics text before jumping in to details. I really don't understand the DC and even order distortion theory. Any references? Maybe my education is lacking on this point but I don't remember this one.
For a start on theory:
http://sound.westhost.com/xfmr2.htm
Later,
Fred
Re: Not because of any asymmetrical nature of audio signals.
This doesn't relate solely to transformers and I can't think of any specific reference off the top of my head.
Basically if the waveform is altered symmetrically, the result is odd-ordered distortion. If it's altered asymmetrically, the result is even-ordered distortion.
For example, the nonlinearity of a single-ended output stage will be asymmetrical which is why single-ended amplifiers tend to produce largely even ordered distortion. In a complimentary output stage, where the waveform is altered symmetrically, the result is largely odd-ordered distortion.
Applying a DC bias current to a transformer effects one half of the waveform differently than it does the other half. In other words, it's asymmetrical and produces even-order distortion products.
se
Fred Dieckmann said:
This doesn't relate solely to transformers and I can't think of any specific reference off the top of my head.
Basically if the waveform is altered symmetrically, the result is odd-ordered distortion. If it's altered asymmetrically, the result is even-ordered distortion.
For example, the nonlinearity of a single-ended output stage will be asymmetrical which is why single-ended amplifiers tend to produce largely even ordered distortion. In a complimentary output stage, where the waveform is altered symmetrically, the result is largely odd-ordered distortion.
Applying a DC bias current to a transformer effects one half of the waveform differently than it does the other half. In other words, it's asymmetrical and produces even-order distortion products.
se
Frank, thanks for the well wishes - the boys are loving it.
I got an email back from Densen from an employee who has worked there only 2 months, that he thinks Densen have never produced a demag box, only the Demagic CD.
Steve - "Applying a DC bias current to a transformer effects one half of the waveform differently than it does the other half. In other words, it's asymmetrical and produces even-order distortion products."
You mean you like non symmetrical compression ?. ie doubling ?.
Eric.
I got an email back from Densen from an employee who has worked there only 2 months, that he thinks Densen have never produced a demag box, only the Demagic CD.
Steve - "Applying a DC bias current to a transformer effects one half of the waveform differently than it does the other half. In other words, it's asymmetrical and produces even-order distortion products."
You mean you like non symmetrical compression ?. ie doubling ?.
Eric.
Belgian Beer! 
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