Amplifier gain decreases after few days -- why?

Discussion in 'Homework Help' started by deter_dangler, Oct 9, 2010.

  1. deter_dangler

    Thread Starter New Member

    May 19, 2010
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    This is a question asked in one of the interviews..

    You designed a amplifier and after few days noticed that the gain of the amplifier decreased..what might be the reason?

    Can any one tell me what could be the reason?
     
  2. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    The resistors you used for the negative feedback warmed up and changed values.

    Or

    You used a trim-pot to dial in your gain, and your evil-twin changed is value over night while you were passed out drunk when you should have been studying. ;)
     
  3. deter_dangler

    Thread Starter New Member

    May 19, 2010
    6
    0
    Thanks for your prompt reply and your time.

    No way..because i don't drink.. :)
     
  4. retched

    AAC Fanatic!

    Dec 5, 2009
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    312
    Just joking with you friend..

    Is the resistor answer something like what you were looking for?
     
  5. deter_dangler

    Thread Starter New Member

    May 19, 2010
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    0
    I don't know i just started reading electronics after spending 4 years in Software industry..:)

    Noticed this questions in one of the websites where answer is not mentioned.
     
  6. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,730
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    The only way tht cud happen is feedback resistor problem as retched said plus coupling cap cud be a culprit
     
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