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Old 29th April 2016, 05:43 PM   #1
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Default Yamaha's new floating and balanced power amplifier

Latest High End HiFi power amplifiers from Yamaha use their floating and balanced circuit. Power transistors are same polarity MOSFETs for both halves of waveform and the circuit is complety floating. Any ideas for DIY version? Do you think that it is promising circuit?

Yamaha says:

The basic design of the power amp circuit adopts Yamaha’s own, uniquely developed Floating and Balanced Power Amplifier technology. Adopting output elements with the same polarity on the plus and minus sides of the output stage, and also completely separating the NFB (Negative Feedback) circuit and power supply into total of four plus and minus sides of the left and right channels, results in thoroughly symmetric push-pull operation of the output stage, Completely floating the entire power amp circuit from the ground removes any negative impact of minute voltage fluctuations or ground noise. Moreover, the output elements are comprised of MOSFETs, which provide a warm and natural sonic character. The use of MOSFETs, which have the same polarity on the plus and minus sides, further evolves the ideal of a complete symmetrical design, to eliminate sound quality variations due to difference in polarity—a major distinguishing characteristic of the Floating and Balanced Power Amplifier—resulting in sound with a superior signal-to-noise ratio and superbly well-defined sound field.
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Old 29th April 2016, 06:01 PM   #2
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It was designed by Crown a number of years ago, otherwise known as the floating ground system.
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Old 29th April 2016, 06:09 PM   #3
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Its a circlotron , check this example
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Old 29th April 2016, 08:42 PM   #4
llwhtt is online now llwhtt  United States
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MOSFET Sumo GOLD/NINE or Atmasphere, nothing new except the MOSFETs.

Craig
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Old 29th April 2016, 08:48 PM   #5
xrk971 is offline xrk971  United States
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+1 on Circlophone or Circlotron. Same sex output devices and sliding bias - possibly same as floating ground? Latest inverted JFET input Circlotron could probably be modified to have MOSFETs on output stage.

See schematic of Circlophone here:

♫♪ My little cheap Circlophone© ♫♪

Click the image to open in full size.

Last edited by xrk971; 29th April 2016 at 08:53 PM.
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Old 30th April 2016, 07:49 AM   #6
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How does Ciclotron sound compared to conventional solid state circuits? Are there some subjective advantages?
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Old 30th April 2016, 07:56 AM   #7
xrk971 is offline xrk971  United States
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I have Circlophone with JFET input and it is perhaps my best sounding amp from standpoint of great bass dynamics, overall transparent response without adding coloration - smooth mids and highs with no sibillance. It sounds like a class A amp without the class A heat output.
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Old 30th April 2016, 02:06 PM   #8
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Hi,
my little Circlotron, the Zirclon140, sounds very well. I never have such a silent amp, no hum and very less noise.

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I have Circlophone with JFET input and it is perhaps my best sounding amp from standpoint of great bass dynamics, overall transparent response without adding coloration - smooth mids and highs with no sibillance. It sounds like a class A amp without the class A heat output.
That is also my impression.
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Last edited by moschfet; 30th April 2016 at 02:08 PM.
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Old 1st May 2016, 01:57 PM   #9
jony is offline jony  Poland
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Yamaha in 2007 released a new A-S2000 amplifier whit " Floating and Balanced Power Amplifier technology" (BJT output stage). And this is a new name for a old classics "Circlotron" topology.
https://en.wikipedia.org/wiki/Circlotron
Aikido PP & Solid-State Circlotron
Patent US4229706 - Audio amplifier - Google Patents
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Old 1st May 2016, 06:31 PM   #10
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Quote:
Originally Posted by ivanlukic View Post
Latest High End HiFi power amplifiers from Yamaha use their floating and balanced circuit. Power transistors are same polarity MOSFETs for both halves of waveform and the circuit is complety floating. Any ideas for DIY version? Do you think that it is promising circuit?....
I believe this Circlotron would be suitable as a DIY project..

I Call it INFINITRON
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Last edited by polyphaze; 1st May 2016 at 06:47 PM.
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