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Old 19th August 2011, 10:44 AM   #1
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Default modern incarnations of Hiraga Le Monstre

hello,

what are the modern incarnations of Jean Hiraga "Le Monstre" published in L'Audiophile n°27 (ancienne série) in Feb. 1983 ?
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File Type: jpg L'audiophone n°27 - couverture.jpg (134.5 KB, 722 views)
File Type: jpg L'audiophone n°27 - table.jpg (92.3 KB, 691 views)

Last edited by steph_tsf; 19th August 2011 at 10:52 AM.
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Old 19th August 2011, 12:11 PM   #2
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J.M. Plantefève "Zenotron"
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Old 19th August 2011, 12:23 PM   #3
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Nelson Pass "F5"
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Old 19th August 2011, 12:33 PM   #4
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Originally Posted by steph_tsf View Post
Nelson Pass "F5"
That is a copy of Selectronics Profet...
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Old 19th August 2011, 12:42 PM   #5
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Or a copy of Nelson's amp

Géo
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Old 19th August 2011, 01:53 PM   #6
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Originally Posted by frederic75 View Post
Or a copy of Nelson's amp

Géo
The profet was published quite a few years before the F5

Besides they are not the same, look at the feedback paths.
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Old 19th August 2011, 02:30 PM   #7
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Or maybe Selectronic licensed the J.M. Plantefève "Zenotron" schematic and industrialized a deluxe version with a R-Core transformer and 8 x 10,000µF in the power supply. Jean Hiraga himself reviewed the Selectronic ProFet.
Wait a moment. This is a mono amplifier. I count 4 MOSFETS in total. It is a bridged tied load "Zenotron" incarnation with a floating power supply.

Last edited by steph_tsf; 19th August 2011 at 02:56 PM.
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Old 19th August 2011, 02:39 PM   #8
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I'm looking to other schematics like "Zenquito" or "Buzquito" (or Mosquito). They feature a symmetric voltage amplification stage between the FET input stage and the power MOSFETS. Because of the additional phase inversion, the MOSFETS are now source followers. Shall we say these are modern incarnations of Hiraga "Le Monstre" ? If not, what is their generic name ?
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Old 22nd August 2011, 11:55 AM   #9
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I like R21 + R22 in the F5 schematic! Soft voltage
limits by way of soft current limits. 3 fewer parts
for this function than mine, and might work better.

I was using 4 Zeners and a resistor in feedback.
Voltage knee a little sharper than current knee.
and capacitance of the Zener stack is variable.

I'll give Nelson's way a try, see what happens.
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Old 24th August 2011, 09:24 PM   #10
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Here is something I recently started to play with based on the old le monstre.

I'ts in no way optimized but it is a start.
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File Type: png lemon_dist.png (12.2 KB, 295 views)
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