BJT Amplifier simulation with Proteus ISIS

Discussion in 'General Electronics Chat' started by Kkein, May 20, 2014.

  1. Kkein

    Thread Starter Member

    Jun 10, 2011
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    Hi Gent,

    I'm trying to simulate a single transistor amplifier circuit (using BC547). For some reasons, the output is always zero, my Vc is not 4.5V contrary to my expectation, and VBe is zero. Can anyone please have a look and advise what I'm doing wrong. Or if the software is to blame. Thank you.
     
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  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Your V1 sine source short all your DC current. So you need to add a capacitor (100uF) between V1 and Q1 base.
     
  3. Kkein

    Thread Starter Member

    Jun 10, 2011
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    0
    Jony130, thanks. Vbe is now 1.39mV, but still there is no output. Q point is not 4.5V - is still 0.26mV. Attached is the file.
     
  4. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Very strange but in my computer your BJT amp work just fine (proteus 7.7 sp2).
    So I don't know what is going on. Try change BJT type.
    I Attached my file.
     
  5. Kkein

    Thread Starter Member

    Jun 10, 2011
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    Genius, you're my friend. I changed the Transistor, and wallah, it works.

    Thanks Jony130.
     
  6. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    I'm glad to hear that. But we also can come to conclusion that you have some bug in your proteus version.And my version don't have this bug.
     
  7. Kkein

    Thread Starter Member

    Jun 10, 2011
    46
    0
    Agreed. May be time to update my version.
     
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