common emitter amplifier

Discussion in 'General Electronics Chat' started by bhuvanesh, Aug 11, 2013.

  1. bhuvanesh

    Thread Starter Member

    Aug 10, 2013
    268
    2
    [​IMG]


    [​IMG]


    what is the red line indicates and what is blue line indicates..

    the otput is a Signal clipped at collector due to lack of DC base bias.in ce amplifier circuit


    ..give me ur skype id so that i can clarify my doubts plzzz
     
  2. #12

    Expert

    Nov 30, 2010
    16,278
    6,791
    Red is the voltage at point 1. Blue is the current through the speaker.
     
  3. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    Where does Skype fit into this? I'm confused?
     
  4. ScottWang

    Moderator

    Aug 23, 2012
    4,853
    767
    Haha, he wants to talk to you on skype to ask and solve his problem... :)
     
  5. ScottWang

    Moderator

    Aug 23, 2012
    4,853
    767
    You need to in series a small resistor to limit the current of speaker, otherwise you don't know what time the power will damaged the speaker.
     
  6. crutschow

    Expert

    Mar 14, 2008
    13,003
    3,232
    The maximum power that can be delivered to an 8Ω speaker with a 50% duty-cycle square wave and a 15V supply is 14W. So unless the speaker is rated for less than 15W you shouldn't need any current limiter.
     
  7. ScottWang

    Moderator

    Aug 23, 2012
    4,853
    767
    You are right, but that is talking about the correct working situation, if the input stay at a high voltage then it could make the bad things happen and that you don't like it, so that's what I like to avoid something.
     
  8. bhuvanesh

    Thread Starter Member

    Aug 10, 2013
    268
    2
    i wants to talk to you on skype to ask and solve his problem..plzzz ..i need some more clarification
     
  9. Potato Pudding

    Well-Known Member

    Jun 11, 2010
    684
    92
    Red line indicates the input AC voltage. 1.5 Volts Peak at 2kHz.

    Blue line indicates the current through 15V battery, speaker and collector of transistor.

    This is a class C amplifier. It only conducts for the short time of the positive peak when the input signal provides more than the 0.7 volts needed to forward bias the transistor.
     
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