LM3900 output

Discussion in 'The Projects Forum' started by Neil Groves, Dec 2, 2011.

  1. Neil Groves

    Thread Starter Member

    Sep 14, 2011
    125
    3
    Hi Guys...

    I am building a circuit using the LM3900, i am building section by section and testing as i go, i have a sinewave going into the chip at pin 3, the output at pin 4 however is severely clipped top and bottom, with the device i am using should i expect to see something similar at the output or something vastly different? i want to get each section working properly before proceeding to the next.

    Neil.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    It's difficult to put a finger on it, as you have not included a schematic.

    Attaching a schematic to your first post helps focus in on the problem, rather than the lack of a schematic, and wasting time because we don't know what your circuit looks like.

    Opamps need feedback to control the amount of gain. Without proper feedback, you will get either clipping, or oscillations.
     
  3. Neil Groves

    Thread Starter Member

    Sep 14, 2011
    125
    3
    ok next time i will include a schematic, i do see your point.

    Neil.
     
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