E-book Correction: Oscillator circuits.

Discussion in 'Feedback and Suggestions' started by The Electrician, Sep 11, 2009.

  1. The Electrician

    Thread Starter AAC Fanatic!

    Oct 9, 2007
    2,281
    326
    The description of the phase shift oscillator:

    http://www.allaboutcircuits.com/vol_3/chpt_9/4.html

    says that the three RC sections each provide 60° of phase shift, but this is not true. As Chet Paynter says:

    http://wps.prenhall.com/chet_paynter_introduct_6/0,5779,426330-,00.html

    "You would think that each RC network in the phase shift oscillator would produce a 60° phase shift (3 × 60° = 180°), but this is not true. Each RC circuit loads the previous RC circuit, so their phase shifts are not equal. However, the total phase shift must equal 180° for the circuit to operate as an oscillator."
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    Funny you should post that, I was looking at your other thread in the chat forum, followed the same link, and came across this paragraph on the bottom of the section...

    Basically a silly spelling error.
     
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