機器雑談 - パワーアンプ EEEngine

少し前になるが、騒音暴露実験用にYAMAHAのP7000Sという高出力のパワーアンプを使用したことがあり、その回路にEEEngine採用と書いてあったので興味があり少し調べたので記してみる。
アンプのタイプには、A級、B級、AB級、D級、G/H級と様々なタイプがあり、EEEngineはそれらを組み合わせるタイプの回路になる。YouTubeに回路動作時の波形を記録した動画があり、それを見ると一目瞭然である。出力を追随しながら電源電圧をスイッチングすることで消費電力を下げることができる。

探すとサービスマニュアルもあって、自作で同じような回路を試している人達もいるようである。T5Nも同様の回路を採用しており、比較的見やすいので上げてみる。右上がスイッチングの部分で、電圧生成にシャントレギュレータ(NJM431)を使用するのはパワーアンプではあまり見かけないが、そういうのもありなのかと思わせる回路である。

The wrong people like it. The programmers I admire most are not, on the whole,
captivated by Java. Who does like Java? Suits, who don't know one language
from another, but know that they keep hearing about Java in the press;
programmers at big companies, who are amazed to find that there is something
even better than C++; and plug-and-chug undergrads, who are ready to like
anything that might get them a job (will this be on the test?). These people's
opinions change with every wind.

    -- Paul Graham
    -- Java's Cover ( http://www.paulgraham.com/javacover.html )

 <rindolf>  What should I do now?
 <rindolf>  I'll work on Text-Qantor.
 <rindolf>  It's so great not to have a job.
     <Zuu>  yeah, if someone else pays for the food it sure is :D
     <Zuu>  also, i dont really understand much of what you just told me
            :P
         *  Zuu puts a stick into the Text-Qantor
 <rindolf>  Zuu: Qantor == Qantor ain't no TeX/Troff oh really.
 <rindolf>  It's a typesetting system I'm working on.
         *  Zuu hates the name
     <Zuu>  it makes me kinda mad actually :/
 <rindolf>  Zuu: :-)
 <rindolf>  Zuu: maybe it will grow on you.
 <rindolf>  Zuu: some people I know named a browser suckass.
     <Zuu>  :(
 <rindolf>  I refused to work on it.
     <Zuu>  see that's a name!
 <rindolf>  Zuu: heh.
     <Zuu>  i didnt mean that btw :)
     <Zuu>  suckass is kinda... unkind
 <rindolf>  OK, now I should write an
            http://www.shlomifish.org/humour/bits/facts/XSLT/
            transformation.
 <rindolf>  I'll start from something I already have.
     <Zuu>  But the "X ain't no <something related>" is just a lame naming
            convention imho
     <Zuu>  yeah, work on some XSLT facts :D
 <rindolf>  Zuu: just call it Qantor then.
 <rindolf>  Without the mnemonics.
     <Zuu>  but anyone interrested will learn that it's an abbreviation
     <Zuu>  just by the fact that it's recursive makes me want to kill
            myself a little bit more :P
 <rindolf>  Zuu: do me a break and kill yourself.
     <Zuu>  :>
 <rindolf>  Less Zuus - more grass for evil reindeers like me to feed on.

    -- What is Qantor?
    -- ##programming, Freenode

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