amplifiers

Discussion in 'General Electronics Chat' started by ronn, Dec 10, 2009.

  1. ronn

    Thread Starter Member

    Nov 1, 2007
    16
    0
    What is the difference between an ac amplifier and a dc amplifier?
    thanks,
    Ron
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    In general, an AC amplifier will have capacitors between one or more stages to eliminate DC offfset. A DC amp will amplify down to DC.
     
  3. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    You need to distinguish between

    An AC coupled amp v a DC coupled amp

    and

    an amp for amplifying AC v an amp for amplifying DC.

    Been There was talking about the first situation. In general a DC coupled amp presents no capacitors in the signal path and is therfore capable of amplifying DC. It is also capable of amplifying AC - up to its frequency limit. This does not mean there are no capacitors in the amp - there may be bypass and feedback caps.

    The second situation is more complicated as certain types of amps exist which amplify DC by converting it to AC - they are called chopper amps.
     
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