op amp

Discussion in 'The Projects Forum' started by leftbehind5805, Mar 13, 2010.

  1. leftbehind5805

    Thread Starter New Member

    Mar 12, 2010
    8
    0
    Attached is a power amplifier and I am curious is there a better op amp to use that is also low powered?
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    The 741 Operational Amplifier is 40+ years old. When it was first introduced, it was the greatest thing since sliced bread. If it were a car, it would be a 1966 Ford Falcon with 4 cylinders (one misfiring), stick shift, patched seats, and a busted headlight. It is very slow, noisy, and has non-linear characteristics compared to more modern opamps.

    A TL071 is much better, but it requires 9v or more to have a 5v output swing.
    There are rail-to-rail input and output opamps available nowadays.

    We do not know what your requirements are. It would help if you described what kind of signal you were planning on amplifying (frequency range).

    By the way, your discrete Darlington AB follower would have terrible crossover distortion, as you are not keeping the bases near their thresholds.
     
  3. leftbehind5805

    Thread Starter New Member

    Mar 12, 2010
    8
    0
    Thanks for the hint, I have already made the necessary changes to the circuit to avoid any distortion. For the class that I am in the op amp we have only been introduced to the 741, that is the only one i am familiar with. As for the input we lets just assume a 1kHz for frequency.
     
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