I just came across this article and I have to say I have never heard of magnetic amplifiers before. Were these types of designs ever used in amplifiers or other high end audio we see today? Considering this was used for military tech at the same time as the vacuum tube I would think there would be some audio maps made this way.
Magnetic Amplifiers
Does anyone have schematics for this technology or ideas on if it's worth salvaging for home audio?
Magnetic Amplifiers
Does anyone have schematics for this technology or ideas on if it's worth salvaging for home audio?
Are the basic devices available for purchase anywhere in the world? Does the seller provide datasheets of any kind?
Popular in Europe in the 90ies:
http://www.auditorium-23.de/MagAmp/MagAmp.html
https://www.lundahltransformers.com/pro-audio/ Sold them
http://www.auditorium-23.de/MagAmp/MagAmp.html
https://www.lundahltransformers.com/pro-audio/ Sold them
Miss you awsome participants got rid of all my speaker collection from the 70s . Voit design I made with b3n under $10 . They are so real in voice reproduction bass is real and not fake. Smooth I promise!
Hey check out this video!! :O
I have been reading up on these things for years, I am definitely gonna explore this Technology some more !!! 😀
jer 🙂
P.S I like this guys projects, I have followed him for years but his mag amp stuff is all new to me !! 😉
http://www.sparkbangbuzz.com/
Here is one more, Very Cool Stuff !!
Cheers !!!
jer 😉
I have been reading up on these things for years, I am definitely gonna explore this Technology some more !!! 😀
jer 🙂
P.S I like this guys projects, I have followed him for years but his mag amp stuff is all new to me !! 😉
http://www.sparkbangbuzz.com/
Here is one more, Very Cool Stuff !!
Cheers !!!
jer 😉
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oops missed the link !!
Here is an old book I knew of years ago but never got a copy !!
Until I saw that video I have always wondered if it could maybe produce some decent audio as theory says it can and the video shows it very well can !!Got those Gears spinning again !! He,he,he,he
https://worldradiohistory.com/BOOKS...ers-Principles-And-Applications-Paul-Mali.pdf
jer 🙂
Here is an old book I knew of years ago but never got a copy !!
Until I saw that video I have always wondered if it could maybe produce some decent audio as theory says it can and the video shows it very well can !!Got those Gears spinning again !! He,he,he,he
https://worldradiohistory.com/BOOKS...ers-Principles-And-Applications-Paul-Mali.pdf
jer 🙂
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Magnetic amplifiers are also used as “variable reactors”. By using the DC windings to change the core’s saturation changes the inductance. Of course the other technique is to change taps on the windings.
Pretty important parts in AC power generation systems.
Mag amps as far as I know are still used to control electric arc furnaces.
Frequency response limited typically but if you want a megawatt or more of power!
https://en.m.wikipedia.org/wiki/Variable_shunt_reactor
Pretty important parts in AC power generation systems.
Mag amps as far as I know are still used to control electric arc furnaces.
Frequency response limited typically but if you want a megawatt or more of power!
https://en.m.wikipedia.org/wiki/Variable_shunt_reactor
In the 70s, he did course work on the calculation of a magnetic amplifier.
The principle of operation is a change in the magnetic permeability of the inductor core due to direct current through the control winding. Otherwise - permanent magnetization.
In the 90s I met SMPS, in which the magnetic amplifier was responsible for voltage stabilization.
Also used in servo amplifiers and excitation current regulators of electric motors and generators.
The principle of operation is a change in the magnetic permeability of the inductor core due to direct current through the control winding. Otherwise - permanent magnetization.
In the 90s I met SMPS, in which the magnetic amplifier was responsible for voltage stabilization.
Also used in servo amplifiers and excitation current regulators of electric motors and generators.
Hummmm 🤔
And other Hummmmm,
I have this in bank of work, in experimentation.
And it is hard, and very very dificut.
Very much info, schemes but simplificatex, book, more of 100 i reed, in 10 years time.
But nothin in this time.
Not see ssmples de funtional schemes, or probe circuits.
All very dificult an confuse for my.
This short amplifity.
The material new for investigate is hight cost, for my 😿.
I have big interesting in aply this for guitar amp.
Shor amplificatión at this moment but afordable or good rever in delay or retard in this cores magnetics.
And in the worl of the guitar is good the distortion armonics, 2º armonics etc, yes.
Have some esches fix?, realistic, probe,
I continue, not know where i go whit this.
I am of Madrid, Spain.
Sorry for mi limited write English, type telegram 😅
But the firdt and more important:
Help, help, whih this.
Thanks
And other Hummmmm,
I have this in bank of work, in experimentation.
And it is hard, and very very dificut.
Very much info, schemes but simplificatex, book, more of 100 i reed, in 10 years time.
But nothin in this time.
Not see ssmples de funtional schemes, or probe circuits.
All very dificult an confuse for my.
This short amplifity.
The material new for investigate is hight cost, for my 😿.
I have big interesting in aply this for guitar amp.
Shor amplificatión at this moment but afordable or good rever in delay or retard in this cores magnetics.
And in the worl of the guitar is good the distortion armonics, 2º armonics etc, yes.
Have some esches fix?, realistic, probe,
I continue, not know where i go whit this.
I am of Madrid, Spain.
Sorry for mi limited write English, type telegram 😅
But the firdt and more important:
Help, help, whih this.
Thanks
The main problem with DIY magamps is accessing the specific cores.
Besides these practical issues I do not know any reason that makes them attractive for audio amplification.
Besides these practical issues I do not know any reason that makes them attractive for audio amplification.
MagAmps are fundamentally useless for direct audio amplification: they can only process AC signals, not the DC of the power supply rails.
There are workarounds, like modulating the ultrasonic AC with the audio and demodulating it at the speaker level, but it brings extreme complications and inefficiencies.
Just use a regular class D amp, they are now mature and relatively simple
There are workarounds, like modulating the ultrasonic AC with the audio and demodulating it at the speaker level, but it brings extreme complications and inefficiencies.
Just use a regular class D amp, they are now mature and relatively simple
Well of course there was this from Carver:
https://patents.google.com/patent/US4218660
The Carver "magnetic" amplifier seems to be a variable switching DC supply that follows the audio envelope, similar to the more recent Yamaha. The Yamaha uses two +/- buck regulators while the Carver used + and - rectifiers from a high frequency transformer.
The Carver "magnetic" amps were a novelty for a couple years, but soon disappeared, I think largely due to sound quality issues.
But seems like most of you are talking about core saturation devices, which create a ~variable inductor with a small ~DC control current. These were used in power supplies to vary the AC input to the rectifier. But the output (after rectifiers) is DC, not audio.
https://patents.google.com/patent/US4218660
The Carver "magnetic" amplifier seems to be a variable switching DC supply that follows the audio envelope, similar to the more recent Yamaha. The Yamaha uses two +/- buck regulators while the Carver used + and - rectifiers from a high frequency transformer.
The Carver "magnetic" amps were a novelty for a couple years, but soon disappeared, I think largely due to sound quality issues.
But seems like most of you are talking about core saturation devices, which create a ~variable inductor with a small ~DC control current. These were used in power supplies to vary the AC input to the rectifier. But the output (after rectifiers) is DC, not audio.
Okay, now with Google Translate you'll understand me better. Hehe Well, my main reason and interest is because it's the only topology I haven't even mastered 5% of in audio amplification. I also mentioned that my interest is to direct it to the electric guitar field. I've made many classic amps based on Fender tubes, as well as very complex OTL amps and things, in low +/- ohm and mid/high, with excellent results, even OTL with the entire impedance line at 800 ohms, or 8 ohms. Ugh, but the magnetic amplifier is something much more complex, as you can see and know. There's the challenge of making an amplifier with only discrete components, no integrated circuits, no tubes or transistors, that's the point! Good day!