VERY URGENT HELP ABOUT COMMON-COLLECTOR AMPLIFIER??

Discussion in 'General Electronics Chat' started by dogar sahab, Oct 24, 2008.

  1. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    In common-collector amplifier
    I want to ask that
    If I place capacitor instead of resistor at the output,will amplification take place??
    and if not then why???
     
  2. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    here is the schematic from the site's book:
     
  3. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    I also want to ask
    If I short-circuit the emitter-resistance(Rfeedback),what would be the effect on output side????
     
  4. hgmjr

    Moderator

    Jan 28, 2005
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    Your question is concerning a common-collector transistor stage. The diagram you have posted is that of a common emitter stage.

    Which amplifier configuration is you question about?

    hgmjr
     
  5. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    oh sorry..I want to ask about COMMON-COLLECTOR cofiguration..
    I just want to make my question clear..I didnt have a complete look!!!
     
  6. hgmjr

    Moderator

    Jan 28, 2005
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    Here is a Common-collector stage. Is this what you had in mind?

    hgmjr
     
  7. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    perfectly!!!!
     
  8. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    hgmjr..would u plz come on messenger..I wnat to ask few Q..I have viva tomorrow!!!
     
  9. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    another Q is that,
    If i have capacitor attached on the collector,what would be the effect on output!!!??
     
  10. hgmjr

    Moderator

    Jan 28, 2005
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    The answer to your question is that there would be no effect on the output.

    The output of a common-collector transistor stage is taken from its emitter.

    hgmjr
     
    Last edited: Oct 24, 2008
  11. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    and Q
    If I short-circuit the emitter resistance which is Rload in your figure,what would be the effect on output!!!??
     
  12. hgmjr

    Moderator

    Jan 28, 2005
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    Your question is not crystal clear.

    If I understand it correctly, then the output would be grounded and the transistor would probably be destroyed.

    hgmjr
     
  13. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    ok..you have rightly understood my Q and I have got your answer!!!
    plz help me out in DIRECT-COUPLED COMMON-EMITTER COMMON-EMITTER (CASCADED AMPLIFIER)???
     
  14. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    I cant find it in the book on this site about direct-coupling??
     
  15. hgmjr

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    Jan 28, 2005
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    What is your question concerning a direct coupled common-emitter amplifier? Do you have a specific circuit diagram to use to aid in the discussion?

    hgmjr
     
  16. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    actually I have diagram in my book but I dont have scanner to make u see that!!!
    It's a simple DIRECT COUPLED CASCADED MULTISTAGE AMPLIFIER in which two COMMON-EMITTER TRANSISTORS are directly coupled!!!
    In that case
    If I short-circuit the emitter-resistance,what would be the effect on th output voltage waveform??
    and the other Q is that
    If i connect a capacitor on the collector side in that configuration,will still the amplication take place????
     
  17. hgmjr

    Moderator

    Jan 28, 2005
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    Without a schematic of the circuit, it is difficult to determine which of the two emitters you are referring to.

    hgmjr
     
  18. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    I have found the circuit in the site's book:
    i have just 2 stages not 3...
    just add resistance in the emitter side in first transistor as well as second!!!
    and then my Q would be clear to u!!!
     
  19. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    ^this was the circuit I was asking!!??
     
  20. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
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    and there is no CAPACITOR in between the transistors..obviously i dont need CAPACITOR COUPLED MULTISTAGE AMPLIFIERS!!!
     
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