Some help required!!

Discussion in 'General Electronics Chat' started by curriejohn, Mar 2, 2015.

  1. curriejohn

    Thread Starter New Member

    Feb 17, 2015
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    IMG_2552.JPG

    Hi guys

    Is anybody able to assist me with the questions shown in the attached photo image.

    Thanks
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,641
    2,344
    Hello,

    The picture is not clear as the moire lines make it unreadable.

    Bertus

    PS is this homework?
     
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
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  4. curriejohn

    Thread Starter New Member

    Feb 17, 2015
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    Hi Bertus

    This is part of a home study course I am currently completing to improve my qualifications to move towards changing my career. I know it may be a simple question to ask but being away from education for such along time is making it harder for me to understand things.
     
  5. curriejohn

    Thread Starter New Member

    Feb 17, 2015
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    Is this picture any better?
     
  6. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Yes that's better, but it's still a Common Source amplifier as per post#3.
     
  7. curriejohn

    Thread Starter New Member

    Feb 17, 2015
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    Thanks Dodgydave

    But with respect to the first image I posted are you able to explain to me the questions that are being asked.
     
  8. Roderick Young

    Member

    Feb 22, 2015
    408
    168
    It's a class A amplifier.

    Capacitor on the gate: to remove any DC component of the input signal, and allow the transistor (which appears to be a MOSFET) to be biased at the desired point.

    Two resistors on the gate of the transistor: form a voltage divider, and set the voltage at the gate when no signal is applied.

    Transistor: provides voltage gain.

    Resistor on the source of the transistor: provides some negative feedback, which makes the gain of the circuit less dependent on the transistor, and also has benefits for frequency range.

    Resistor on the drain of the transistor: converts current through the transistor to voltage for output.

    My explanations are informal - the linked article above gives a much more rigorous treatment.
     
    bwilliams60 likes this.
  9. curriejohn

    Thread Starter New Member

    Feb 17, 2015
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    Thanks Roderick

    An excellent well explained reply which is going to be very helpful for me when completing my assessment.
     
  10. Roderick Young

    Member

    Feb 22, 2015
    408
    168
    No problem, but please be sure that you understand the concepts. If you're typing anything into your assessment that you don't personally understand, you'll only hurt yourself in the long run. Just saying.
     
    curriejohn likes this.
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