Para-Magnetic Current Amplifier

Tyimo · 30th September 2007, 07:39 AM

Hi!

Do somebody know this kind of amp???

http://www.lizardwizardaudio.com/pmctheory_en.html

I wouldlike to understand how it works

I even don't know what would be the correct place for this thread!

Tyimo

Jan Dupont · 30th September 2007, 08:13 AM

A Class D Amp working as a Current generator ??

QSerraTico_Tico · 30th September 2007, 08:16 AM

Quote:

Originally posted by Tyimo
Hi!

Do somebody know this kind of amp???

http://www.lizardwizardaudio.com/pmctheory_en.html

I wouldlike to understand how it works

I even don't know what would be the correct place for this thread!

Tyimo

I don't understand a word of it! But who am I? [joke]
Either it's BS or a stroke of a genius.

Tyimo · 30th September 2007, 09:32 AM

Quote:

A Class D Amp working as a Current generator ??

No. There is no active device like transistor, Fet or Tube in the amp. (as I know...)

They use an electromagnetic (iron core) coil and control the coil's fluxus with a resistor.

Tyimo · 30th September 2007, 09:35 AM

Quote:

I don't understand a word of it!

Me too! And even in my own mother language....

Jan Dupont · 30th September 2007, 09:38 AM

And how would you control the flux without any active components ???

jaycee · 30th September 2007, 03:16 PM

With a flux capacitor!

1.21 Gigawatts!

Steven · 30th September 2007, 04:05 PM

To me it seems just an amplifier with an output resistance of, say, 4 ohm. Of course, the frequency response will just change depending on the actual speaker impedance at a certain frequency.
This can be accomplished by inserting a 4 ohm resistor in series with the output, or by a combination of voltage and current feedback. The latter solution has lower losses (dissipation).
I admit that this simple solution does not completely explain the shown graphs (see Measures on their site). At low frequencies (from 20Hz), the output impedance differs from the impedance at 1kHz, but in strange way. With 3 ohm load the output impedance is rather low at 20Hz, while with 36 ohm load it is rather high at the same 20Hz.

Steven

Tyimo · 30th September 2007, 04:44 PM

Quote:

And how would you control the flux without any active components ???

I don't know...

O.K. May be there is an active component, but not in the signal pass. May be, but I heard that there isn't any....

Some little info:
http://blog.stereophile.com/hifinews2006/092406lizard/

analog_sa · 30th September 2007, 05:09 PM

Quote:

Originally posted by Tyimo

I don't know... O.K. May be there is an active component, but not in the signal pass. May be, but I heard that there isn't any....

This is really great: finally a passive power amp to complement the passive pre in my green room

Of course there may also be a pair of chipamps transformer coupled to the speaker.

30th September 2007, 07:39 AM	#1
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Para-Magnetic Current Amplifier Hi! Do somebody know this kind of amp??? http://www.lizardwizardaudio.com/pmctheory_en.html I wouldlike to understand how it works I even don't know what would be the correct place for this thread! Tyimo

30th September 2007, 08:13 AM	#2
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	A Class D Amp working as a Current generator ?? __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

30th September 2007, 09:38 AM	#6
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	And how would you control the flux without any active components ??? __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

30th September 2007, 04:05 PM	#8
Steven diyAudio Member Join Date: Oct 2003 Location: The Netherlands	Obfuscation To me it seems just an amplifier with an output resistance of, say, 4 ohm. Of course, the frequency response will just change depending on the actual speaker impedance at a certain frequency. This can be accomplished by inserting a 4 ohm resistor in series with the output, or by a combination of voltage and current feedback. The latter solution has lower losses (dissipation). I admit that this simple solution does not completely explain the shown graphs (see Measures on their site). At low frequencies (from 20Hz), the output impedance differs from the impedance at 1kHz, but in strange way. With 3 ohm load the output impedance is rather low at 20Hz, while with 36 ohm load it is rather high at the same 20Hz. Steven __________________ The Analog Art shows no sign of yielding to the Dodo's fate. The emergence and maturation of monolithic processing finesse has perhaps lagged a bit behind the growth of the Binary Business. But whereas digital precision is forever bounded by bits, there is no limit excepting Universal Hiss to the ultimate accuracy and functional variety of simple analog circuits. - Barry Gilbert, 1973

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30th September 2007, 03:16 PM	#7
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	With a flux capacitor! 1.21 Gigawatts!

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