dc offset

Discussion in 'General Electronics Chat' started by gw95, Jan 28, 2012.

  1. gw95

    Thread Starter New Member

    Nov 9, 2011
    5
    0
    what is dc offset exactly and how is it applied to electronic circuits?
     
  2. PaulEE

    Member

    Dec 23, 2011
    423
    32
    DC offset is a deliberate introduction of a DC level to a circuit to shift its operating point.

    For example, DC offset is applied to transistors to make them work correctly, as well as op-amps for use with a single polarity power supply.

    There are countless other examples, but those are common ones. :)
     
  3. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    DC offset might be a bad thing sometimes. When wiring an Operational Amplifier, a DC voltage will appear at its output even no voltage difference is applied at its input.

    There are ways to counter that, though.
     
  4. holnis

    Member

    Nov 25, 2011
    50
    4
    DC offset occurs when hardware,for example, such as a sound card, adds DC current to a recorded audio signal. This current results in a recorded waveform that is not centred around the baseline .

    In some cases, when DC-Offset is present, glitches and other unexpected results can occur when sound effects are applied to the audio file. You can compensate for this DC offset by adding a constant value to the samples in the sound file.
     
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