Need help with a circuit

Discussion in 'The Projects Forum' started by marajput, Apr 10, 2011.

  1. marajput

    Thread Starter New Member

    Nov 21, 2010
    1
    0
    This circuit does not work on MultiSIM Please tell me what is the problem
     
    Last edited: Apr 10, 2011
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    What "does not" work? Details...details...details! ;)

    Ken
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    I don't see a screen capture image of your Multisim schematic; only one that looks like it came from a website somewhere.

    You should bring up the schematic in Multisim, do a screen capture by pressing Ctrl+PrintScreen, and then start MS Paint and paste the image into Paint.
    Then save the image in .png (portable network graphics) format, and upload it to the forum.

    .png format is preferred, as the format is very compact, needs no other software than a browser to view, and is not "lossy" like .jpg files are.
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Multisim does not make an oscillator run unless something "kicks" it to run.
    Multisim does not know that the liquid is supposed to conduct a little or a lot.

    The circuit will work if you build it and use lots of salt in the liquid to make it conduct.
     
  5. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    If you happen to know what the conductivity of the liquid you are sensing is then you might try substituting an equivalent value of resistance to see how your sensing circuit would react.

    hgmjr
     
  6. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    You didn't say what your liquid is but just about all water (except for distilled) will easily conduct enough to forward bias the transistors in your circuit. It's not the water that conducts, it's the minerals that's suspended in it. It looks like your building a beep-beep-... circuit.
     
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