LM301AN substitute?

Discussion in 'Analog & Mixed-Signal Design' started by GodsmacK, Jul 4, 2016.

  1. GodsmacK

    Thread Starter New Member

    Jun 18, 2016
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    Hello, I'm looking for an improvement or equivalent for the LM301AN because I'm making an oscillator but I gives me some distortion in the output waveform. Hope you can help me...
     
  2. hp1729

    Well-Known Member

    Nov 23, 2015
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    Some differences exist is offset and frequency compensation, but most op amps should work. It is hard to get specific without a schematic and waveforms you were getting.
     
  3. dl324

    Distinguished Member

    Mar 30, 2015
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    Post a schematic and a picture of the distortion.
     
  4. Techno Tronix

    Member

    Jan 10, 2015
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    I am thinking about 2N2955. What you say?
     
  5. DickCappels

    Moderator

    Aug 21, 2008
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  6. dl324

    Distinguished Member

    Mar 30, 2015
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    I took @Techno Tronix's post as a sarcastic rejoinder to an ambiguous request for help...
     
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  7. GodsmacK

    Thread Starter New Member

    Jun 18, 2016
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    I'm making this circuit, from which I get tunable frequency triangle waveform from U1 and a square from U2. I have no problems when simulating it.
    3.PNG
    However, in real life, this is how the triangle waveform looks like with the LM301. Much distorsion and frequency doesnt change

    1.PNG

    Yet, the square is good and I can tune it.
    2.PNG

    PD. I used Hantek USB Oscilloscope.
     
  8. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    @GodsmacK

    In real life, your OP amp is not perfectly balanced & compensated. That OP was designed before laser trimming was used. From the datasheet, there is information how to balance that op amp.

    image.jpg
     
  9. DickCappels

    Moderator

    Aug 21, 2008
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    The Thread Starter has another thread going on this forum, apparently about the same signal generator. Having more than one thread for a given topic is usually not allowed but since this thread is sticking to op-amp selection I will not close it, though other moderators might have different ideas.

    The URL of the earlier thread that continues to this time is provided below for context for this discussion.
    http://forum.allaboutcircuits.com/t...itude-function-generator.125115/#post-1015223
     
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  10. schmitt trigger

    Active Member

    Jul 12, 2010
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    You can get away by not using the compensation capacitor on the left-hand opamp which is operating as a comparator. But the second one which operates as a linear integrator, should have a compensation capacitor.
     
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