Need Help in Electronics devices

Discussion in 'Homework Help' started by full, May 3, 2014.

  1. full

    Thread Starter Member

    May 3, 2014
    225
    2
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,553
    2,375
    ...............and the question is???
    Max.
     
    full likes this.
  3. full

    Thread Starter Member

    May 3, 2014
    225
    2
  4. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,394
    497
    Seems simple enough. I think textbook should have example or two on how to solve this type of problem.
     
    full likes this.
  5. full

    Thread Starter Member

    May 3, 2014
    225
    2
    http://postimg.org/image/74ghsdpul/

    if simple for u !
    can u explain how get answer i1 and i2?

    thanks:)
     
  6. SneakSZ

    New Member

    Sep 19, 2012
    10
    1
    Use Thévenin to create an equivalent schematic at the base of the transistor.

    Rb= R1//R2
    Vb= (Vcc*R2)/(R1+R2)
    Now you can find Ib ==> Vb = -Ib*Rb -0.7 -Ie*Re with Ie=Ib(beta+1)
    Ib= -(Vb+0.7)/(Re(beta+1)+Rb)

    Go back the orignal schematic and now you know what current is flowing out of the base.

    Vcc = (I2+Ib)*R1+I2*R2 ==> Find I2
    I1 = I2+Ib

    Mind the signs.
     
  7. full

    Thread Starter Member

    May 3, 2014
    225
    2
    thanks bro
     
Loading...