How does this oscillator work?

Discussion in 'General Electronics Chat' started by DFR123, Aug 22, 2011.

  1. DFR123

    Thread Starter New Member

    Aug 22, 2011
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    1
    Hi I would like to know how the circuit in the attached picture works.

    I don't get it.

    Thank you very much
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    That circuit is a poor design, as there is too much hysteresis feedback.

    I've re-drawn the schematic so that it is easier to understand, corrected the hysteresis, and added plots of the +, -, and output so that you can see how it works.

    [eta]
    The circuit that Bertus linked to uses a dual supply for the opamp, so the resistor divider like I used (R2, R4) can be simplified by removing R2.
     
    DFR123 likes this.
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