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transistor question

Discussion in 'Electronic Basics' started by zalzon, Jul 30, 2003.

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  1. zalzon

    zalzon Guest

    Two questions to clear up my understanding of circuits and transistors
    :

    1) Is it true that transistors in common emitter amplifier circuits
    increase both the voltage AND current of the input AC signal?

    2) Is it fair to say that part of DC in the circuit is being used to
    amplify the AC signal. That is some of the dc takes on the
    characteristics of the AC by rising and falling in response to the AC
    signal voltage at the base. The remaining DC is then filtered out.
    Is that right using a capacitor. Is that right?.

    Please I just need simple (preferably a yes on both :) answers to the
    above questions, not the full explaination on how transistors work.
    This is just to confirm if my understanding of transistors is on the
    ball.

    Thanks.
     
  2. A common emitter amplifier has the potential for both current and
    voltage gain. The details of the surrounding circuit determines if
    the whole circuit has both current and voltage gain.
    That is the general idea. The transistor converts some of the DC
    supply energy into signal frequency energy, and wastes the rest.
    There are several ways to keep the supply out of the input and output
    paths, coupling capacitors being one way.
    Then, yes and yes.
     
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