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Square wave oscillator help please.

Discussion in 'Electronic Basics' started by John Popelish, Jul 25, 2004.

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  1. Sorry, I cant find any reference to a square wave oscillator on this
  2. If you download the datasheet in PDF form, then it's in the bottom right corner
    on page 5 of the amplifier datasheet.

  3. Thank you. Adjust the size of the capacitors by 1/40.
  4. It's on the datasheet (page 5)

    Best regards,
  5. You are probably looking for this, time period of square waves is

    T=2*RC*In((2R1 + R2)/R2)

    Where in the original schematic
    R=30k, C=.1u, R1=1k and R2=10k

    Adjust these values which suit you the best.

    Best regards,
  6. Rubicon

    Rubicon Guest


    Can anyone help me change this LM386 1kHz square wave oscillator to
    40kHz? Formulas or a walk through?
    PDF Page 5

    There's nothing that I can find in the PDF to help me and searching
    has found mainly square wave or amplifier kitsets.


  7. Rubicon

    Rubicon Guest

    Thankyou for the help.

    I apologise for not being specific enough, it's something I must
    attend to.


  8. Rubicon

    Rubicon Guest


    0.1uf / 40 = 0.0025uF
    50uF / 40 = 1.25uF

    Both non standard values in my catalogues. Time to work out parallel

    0.0015uF + 0.001uF = 0.0025uF
    1uF + 0.15uF + 0.1uF = 1.25uF

    I thought the LM386 might make a better ultrasonic transducer driver
    than the 555 astable circuit I have but it seems a little messy in


  9. Rubicon

    Rubicon Guest


    Though mathematics was never my strong suit I can work through that
    formula with the 1kHz/circuit values example to start with.

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