transistor amplifier

Discussion in 'Homework Help' started by s.k.sundar, Sep 18, 2010.

  1. s.k.sundar

    Thread Starter New Member

    May 22, 2010
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    0
    i want to design a transistor amplifier.as seen in the attach ment when output is taken across collector and ground i got a output which is amplified for both cycles and produces a phase shift of 180 degree as it is common emitter.
    but when i saw output across emitter and ground i got a output only for positive cycle and not for negative cycle.iam using a bypass capacitor but stil i get a output like this.
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    I already answered this question (on another website?).

    The emitter bypass capacitor has its value much too small so for the 50Hz frequency it does almost nothing.
    The waveforms are clipped because the transistor is wrongly biased so that it is cutoff some of the time.
     
  3. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Greetings s.k.sundar,

    You definitely need to revisit your choice of biasing resistors R2 and R3.

    hgmjr
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    It is simple to calculate the voltages in the circuit and to correct them.
     
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