square wave oscillator using 555

Discussion in 'The Projects Forum' started by kahafeez, Jan 14, 2009.

  1. kahafeez

    Thread Starter Active Member

    Dec 2, 2008
    150
    0
    i made a square wave oscillator using 555 and i had this output plz help me to get the right output.... i gave +5V and gnd as input....
     
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  2. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    I do not see a capacitor of 1 - 10 nF on pin 5 to ground for decoupling



    See this page fig.5 :
    http://www.uoguelph.ca/~antoon/gadgets/555/555.html

    Greetings,
    Bertus
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,535
    More on what Bertus said, tack a 0.1µF cap from pin 5 to ground on the underside of the board.

    You didn't include a schematic, but I know the 555 well enough I can read the board. Also try putting a 10µF and 0.1µF across the power supply.
     
  4. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    In addition to the above suggestions, please also change the 0V point of your signal output as shown.

    You can use a thin wire to make the connection.

    [​IMG]
     
  5. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,535
    I see where you're going eblc, you're thinking inductance. The 555 produces some clean edges, so you could be generating an inductive kick from the long lead length.
     
  6. electratech

    Member

    Jan 5, 2009
    21
    9
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