PNP BJT simulation problem

Discussion in 'General Electronics Chat' started by xxxyyyba, May 20, 2013.

  1. xxxyyyba

    Thread Starter Member

    Aug 7, 2012
    249
    2
    Hi!
    Here is my circuit:

    Code ( (Unknown Language)):
    1. http://oi44.tinypic.com/2zszn7a.jpg
    I guessed that pnp works in direct active mode. I got that Ib=0.01mA, Ic=0.95mA, Ie=0.96mA, Vbc=4.28V>0 so my guess is correct. I simulated circuit in Multisim but I got different results. What's wrong? Did I make mistake somewhere in calculations?
     
    Last edited: May 20, 2013
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,962
    1,097
    Your BJT in the multisime is upside down.
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,052
    3,244
    The last two images are too small to see the detail. Insert them as .gif or other graphics format directly into you post, using the insert Attachments (paper clip) icon in the Go Advanced window. JPEG is for pictures and makes fuzzy drawing renditions.
     
  4. xxxyyyba

    Thread Starter Member

    Aug 7, 2012
    249
    2
    @crutschow
    I hope it's ok now.
    @Jony130
     
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  5. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,962
    1,097
    Now everything looks good. You Sim BJT has slightly larger current gain and Vbe also will be different. And this is why sim show slightly different result than your hand calculations.
     
  6. xxxyyyba

    Thread Starter Member

    Aug 7, 2012
    249
    2
    Thanks a lot!
     
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