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Old 30th September 2007, 07:39 AM   #1
Tyimo is offline Tyimo  Hungary
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Default 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
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Old 30th September 2007, 08:13 AM   #2
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A Class D Amp working as a Current generator ??
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Old 30th September 2007, 08:16 AM   #3
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Talking Re: Para-Magnetic Current Amplifier

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.
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Old 30th September 2007, 09:32 AM   #4
Tyimo is offline Tyimo  Hungary
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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.
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Old 30th September 2007, 09:35 AM   #5
Tyimo is offline Tyimo  Hungary
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Quote:
I don't understand a word of it!
Me too! And even in my own mother language....
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Old 30th September 2007, 09:38 AM   #6
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And how would you control the flux without any active components ???
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Old 30th September 2007, 03:16 PM   #7
jaycee is offline jaycee  United Kingdom
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With a flux capacitor!

1.21 Gigawatts!
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Old 30th September 2007, 04:05 PM   #8
Steven is offline Steven  Netherlands
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Default 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
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Old 30th September 2007, 04:44 PM   #9
Tyimo is offline Tyimo  Hungary
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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/
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Old 30th September 2007, 05:09 PM   #10
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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.
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