Class-AB meets Class-D: Yamaha's EEEngine Topology - where are this Diy Projects? - diyAudio
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Old 20th April 2010, 05:53 PM   #1
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Default Class-AB meets Class-D: Yamaha's EEEngine Topology - where are this Diy Projects?

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)
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Last edited by tiefbassuebertr; 20th April 2010 at 05:57 PM.
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Old 20th April 2010, 06:01 PM   #2
CBS240 is offline CBS240  United States
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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.
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Old 20th April 2010, 06:05 PM   #3
jcx is online now jcx  United States
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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
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Old 20th April 2010, 06:19 PM   #4
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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.
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Old 20th April 2010, 06:25 PM   #5
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Labgrupen FP3400 amplifier use similar tehnology called class TD.
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Old 21st April 2010, 04:13 AM   #6
ontoaba is offline ontoaba  Indonesia
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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.
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Old 21st April 2010, 04:51 AM   #7
ontoaba is offline ontoaba  Indonesia
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Simple Class AB supplied with unstable regulator, yes, near with carver has, but different at the power supply. and not same with labgrupen
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Old 21st April 2010, 08:58 AM   #8
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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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Old 21st April 2010, 10:17 AM   #9
jony is offline jony  Poland
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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
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Last edited by jony; 21st April 2010 at 10:27 AM.
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Old 21st April 2010, 10:27 AM   #10
ontoaba is offline ontoaba  Indonesia
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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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