40k Hz circuit - Please help us

Discussion in 'Homework Help' started by Lasse, Apr 27, 2011.

  1. Lasse

    Thread Starter New Member

    Apr 18, 2011
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    0
    We have a little problem calculating C1 and we need a 40k Hz signal. Please look at the curcuit image..

    Maybe the resistors are not correct so if you have a better idea to find the values are you welcome to whrite to us.
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Try 4.7nF as a starting value.
     
  3. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    I think the circuit is a relaxation oscillator. Try google and something like
    relaxation oscillator opamp

     
  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    With homework, we don't just give answers. You need to show your attempt at getting the answer, and tell us where you are having problems. This will involve doing some math on your part.
     
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