Rate my poweramp design

Discussion in 'General Electronics Chat' started by simeonz11, Apr 16, 2010.

  1. simeonz11

    Thread Starter Active Member

    Apr 29, 2008
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    This is a power amp I have in mind , plz do not laugh yes I work things out brute force with my scope and breadboard , I am not a sim guy .

    Here is the design I have in mind , input will be a sine wave about 2 V p-p anywhere from 300 hz to 20 khz . I am using op amps as phase splitters to drive the mosfets . This is what I believe to be a class A transformer coupled push-pull modified by me .

    Mosfet will probably be a class-d lateral mosfet with 900 pf input capacitance and 12 , still choosing . Op amp is the lm8261 , wich is just perfect for my application from the looks of it .

    So I am gonna be running 2 x mosfets per amp , so 1800 pf input , yes Its strange i know .

    Transformer secondary is floating , load might be anything from capacitive to inductive , put an x value , I am not aiming for maximum power in 8 ohms or w/e , this can go from a couple mA to large amps , most likely a slightly reactive load load ... I wont go beyond 6 amps on the secondary side .

    Transformer will be either 1:1 or 1:2 step up audio range type .

    Plz tell me if this is good , is the biasing resistors good like this ? Do I understand things correctly ?
     
  2. Wendy

    Moderator

    Mar 24, 2008
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    Please don't post the same message twice in two places. It is a violation and a pain.

    Thanks.
     
  3. simeonz11

    Thread Starter Active Member

    Apr 29, 2008
    98
    0
    plz delete this one
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    Sorry, already deleted the other.
     
  5. Wendy

    Moderator

    Mar 24, 2008
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    One of the nice things about this site is the OP can delete their own posts.

    Have you built this design?

    I'm not an expert in this aspect, but I think MOSFETs don't handle linear very well. I could be wrong, I'm sure other opinions will join in.
     
  6. simeonz11

    Thread Starter Active Member

    Apr 29, 2008
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    apparently lateral Mosfets are more linear than even BJTS'S
     
  7. simeonz11

    Thread Starter Active Member

    Apr 29, 2008
    98
    0
    this is a project , I will be deleting this one and starting a new one there , plz delete .
     
  8. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Doesn't work that way. Haven't you heard, while people forget on the internet your mistakes linger. :D
     
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