Class-AB meets Class-D: Yamaha's EEEngine Topology - where are this Diy Projects?

tiefbassuebertr · 05:57 PM

I have heard about power amps from Yamaha, EEEngine technology inside.
Really the absolute "State of the Art" circuit?
Are there already diy projects on the web where this topology is in use?

Here some URL's:
Yamaha Commercial Audio | What?s EEEngine?
EEEngine | Self Training | Training | Yamaha Pro Audio
http://www.yamahaproaudio.com/downlo...tepaper_en.pdf
http://www.yamahacommercialaudio.com...ine/index.html (German)
http://www.yamahacommercialaudio.com..._Tn/index.html (German)

CBS240 · 20th April 2010, 06:01 PM

Isn't this just using class D to provide an envelope for the output devices, sort of similar to a tracking power supply? I don't think it is a new concept.

jcx · 20th April 2010, 06:05 PM

we do have a Class D sub forum but in gerneral why would you expect DIYers to be interested when you need pro engineering skills and tools and a free man-year or so for something of that compelxity?

in return for at best managing to control switching nosie to not mess up a good AB design?

applying more iron, copper and aluminum in a analog design are lots cheaper than the time, extra tools and expertise

also the shortest path for a DIYer to "beat" common commercial systems is to use BiAmping with smaller wattage, lower peak current demands on each amp

event horizon · 20th April 2010, 06:19 PM

This sounds similar to Bob Carvers Brightstar amplifier (i think that's correct, anatech is sure to correct me if i'm wrong

).

As has been said, it's worthwhile on really high power amplifiers. Not run of the mill stuff until technology improves.

apexaudio · 20th April 2010, 06:25 PM

Labgrupen FP3400 amplifier use similar tehnology called class TD.

ontoaba · 21st April 2010, 04:13 AM

What is Lab gruppen output transistor?
This yamaha using SANKEN transistors
7pair 2SC6011B, A2151B at T5N, and working in its linear range. With almost constant Vce, it has better linearity.

ontoaba · 21st April 2010, 04:51 AM

Simple Class AB supplied with unstable regulator, yes, near with carver has, but different at the power supply. and not same with labgrupen

tiefbassuebertr · 21st April 2010, 08:58 AM

I don't get schematics from there and don't find such on the web. Who knows more about schematics from Labgruppen?

jony · 10:27 AM

The Labgruppen FP3400 schematics you can download form here
Categorized Schematics and Service Manuals for free download I-N
And I attached Yamaha T3n power amp with EEEngine
And maybe this has something to to with this Yamaha patent
Amplification circuit

ontoaba · 10:37 AM

Yamaha regulator is based on linear regulator plus current source to help it.
The current source (self oscillating) work to supply almost amplifier current requirement. The result is stable low ripple voltage, fast response, and high efficiency.
Yamaha did a good work.

20th April 2010, 06:01 PM	#2
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	Isn't this just using class D to provide an envelope for the output devices, sort of similar to a tracking power supply? I don't think it is a new concept. __________________ All the trouble I've ever been in started out as fun......

20th April 2010, 06:19 PM	#4
event horizon diyAudio Member Join Date: Feb 2008 Location: East Midlands, England	This sounds similar to Bob Carvers Brightstar amplifier (i think that's correct, anatech is sure to correct me if i'm wrong ). As has been said, it's worthwhile on really high power amplifiers. Not run of the mill stuff until technology improves. __________________ "Never let your morals prevent you from doing what is right!" Salvor Hardin

21st April 2010, 10:27 AM	#10
ontoaba diyAudio Member Join Date: Nov 2009 Location: Kudus, & Malang	Yamaha regulator is based on linear regulator plus current source to help it. The current source (self oscillating) work to supply almost amplifier current requirement. The result is stable low ripple voltage, fast response, and high efficiency. Yamaha did a good work. Last edited by ontoaba; 21st April 2010 at 10:37 AM.

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20th April 2010, 06:05 PM	#3
jcx diyAudio Member Join Date: Feb 2003 Location: ..	we do have a Class D sub forum but in gerneral why would you expect DIYers to be interested when you need pro engineering skills and tools and a free man-year or so for something of that compelxity? in return for at best managing to control switching nosie to not mess up a good AB design? applying more iron, copper and aluminum in a analog design are lots cheaper than the time, extra tools and expertise also the shortest path for a DIYer to "beat" common commercial systems is to use BiAmping with smaller wattage, lower peak current demands on each amp

20th April 2010, 06:25 PM	#5
apexaudio diyAudio Member Join Date: Feb 2010 Location: Serbia	Labgrupen FP3400 amplifier use similar tehnology called class TD.

21st April 2010, 04:13 AM	#6
ontoaba diyAudio Member Join Date: Nov 2009 Location: Kudus, & Malang	What is Lab gruppen output transistor? This yamaha using SANKEN transistors 7pair 2SC6011B, A2151B at T5N, and working in its linear range. With almost constant Vce, it has better linearity.

21st April 2010, 04:51 AM	#7
ontoaba diyAudio Member Join Date: Nov 2009 Location: Kudus, & Malang	Simple Class AB supplied with unstable regulator, yes, near with carver has, but different at the power supply. and not same with labgrupen

21st April 2010, 08:58 AM	#8
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	I don't get schematics from there and don't find such on the web. Who knows more about schematics from Labgruppen?

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