low noise audio amp

Discussion in 'The Projects Forum' started by alec, Jan 10, 2009.

  1. alec

    Thread Starter Member

    Jan 3, 2009
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    hi there,

    does anyone have an idea for a low noise audio amplifier with an output of about 1watt using opamps. the output will be connected to a pair of headphones and the input to a microcontroller..

    ANY ideas would be appreciated!! :D

    A
     
  2. mik3

    Senior Member

    Feb 4, 2008
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  3. Audioguru

    New Member

    Dec 20, 2007
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    Opamps are not power amplifiers. A few opamps can drive 600 ohms headphones (at a power of only 60mW) but cannot drive 32 ohms headphones.

    You can add transistors to the output of an opamp to make a little power amplifier to drive low impedance headphones.

    1W into headphones will blow your head off! And you will be deafened.
     
  4. alec

    Thread Starter Member

    Jan 3, 2009
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    Thanks!! I understand that 1W into headphones is toooo much... Will the transistors (darlington pair) on the output of the opamp be sufficient for an amp similar to a class d amp? I read that class d amps are good amps, but what is the difference between classes and what would you suggest for an audio amp? I read that different configurations are categorised in different classes and that noise also has an influence on the class the amp is categorised in.. :confused:
     
    Last edited: Jan 12, 2009
  5. bertus

    Administrator

    Apr 5, 2008
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  6. jj_alukkas

    Well-Known Member

    Jan 8, 2009
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  7. alec

    Thread Starter Member

    Jan 3, 2009
    10
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    any circuit able to to give an output of more or less 100mW would be perfect, as long as it has a gain of about 100 - 200 and almost non existing noise...

    Thanks!!
     
  8. alec

    Thread Starter Member

    Jan 3, 2009
    10
    0
    thanks for the circuits!! these really helped a lot!!!

    regards
     
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