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  1. #21
    AVClub Enthusiast
    Jun 2006
    , OAKA
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    . , watt ;
    http://sound.westhost.com/class-a.htm
    http://sound.westhost.com/project10.htm

    Determining The Optimum Current
    The ideal operating current for a Class-A amp will be about 110% of the peak speaker current. If the loudspeaker system has a nominal impedance of 8 Ohms (the design impedance for this amp), then with a +/- 22V supply the maximum (theoretical) speaker current is

    I = V / R = 22 / 8 = 2.75A
    In my original calculations, I actually decided on a quiescent current of 2.6A - this is really Ok, because the above calculation does not consider the losses in the output stage. In practice, it is likely that up to 3 Volts will be lost in the output circuit, based on the losses in the output devices, emitter resistors and driver transistors.
    This now gives a maximum voltage of 19V peak (2.375A @ 8 Ohms). Applying the 110% fudge factor gives an operating current of 2.6125A, or 2.6 close enough. If these peaks are met in practice, this gives an output power of 22.5W into 8 Ohms.

    Note that the current in the -ve supply rail remains constant, but that in the +ve supply rail will vary from the normal steady state current (same as the -ve supply). At signal extremes, the current will double (upper transistors turned on), or will drop to almost zero for negative peaks. This is common for single-ended Class-A amplifiers, although you will not see it in the text for most designs. This can complicate the design of the power supply.

    , ( ) .
    G.F.

  2. #22
    Supreme Member
    Jun 2006
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    .

    2006 99% "" , :

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    100 .
    200, .
    , ( 700 8 ).

    , 1.6.

    250 8 , ?
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    --....
    mark levinson no33.
    5.000,000 .

  3. #23
    Support Admin

    Jun 2006
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    gfle
    , ( ) .
    ...

  4. #24

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    .... ;..
    http://www.avclub.gr/forum/image.php?ype=sigpic&userid=9&dateline=1193405655

  5. #25
    AVClub Enthusiast
    Jun 2006
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    , !!

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    8 2, 8*2*2=32. 4 4*2*2=16.
    ()!

    " !!"
    G.F.

  6. #26
    Supreme Member
    Jun 2006
    8,777

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    Morfeas


    250Watt SET. ;
    250 Watts , !!!

    .
    200 G12 ( ) .
    Maggie Nirvana

  7. #27
    Established Member
    Jun 2006
    122

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    250 Watts , !!!

    .
    200 G12 ( ) .
    . MG 2.7 (EAR 509 mkII) . () . , . 70s Audio Research. . (Sorry off topic). ...

  8. #28
    Banned
    Jun 2006
    1,964

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    ... , () 2 1W.

  9. #29
    Supreme Member
    Jun 2006
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    Costas Coyias
    ... , () 2 1W.
    ??????

  10. #30
    Established Member
    Jun 2006
    Nicosia-Cyprus
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    .
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    totem mani 2...
    Last edited by nikolio; 21-07-2006 at 18:46.

 

 

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