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D.C offset

Discussion in 'Electronic Basics' started by Music Man, May 19, 2005.

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  1. Music Man

    Music Man Guest

    What is this and what harm can it do to a piece of equipment?

    Thanks
     
  2. Lord Garth

    Lord Garth Guest


    Alternating current does not have to alternate about 0 volts...when it is
    shifted
    by a constant amount, it is said to have a direct current offset.

    If a DC offset gets coupled to a loud speaker, you could ruin your speaker
    real fast.
     
  3. Ban

    Ban Guest

    Usually, when you average an AC waveform you get exactly 0V, which means the
    wave is symmetrical about 0V. There might be some components esp. opamps and
    amplifiers, which do add a DC-component to the output. Whereas a few
    millivolts are usually of no concern and normal, an extended amount(Volts)
    might harm loudspeakers. You can see the diaphragm going off center and
    staying there, so the excursion is assymmetrical. This causes distortion and
    heating of the voicecoil. A DC-offset can be blocked with a capacitor.
     
  4. Bashir

    Bashir Guest

    Dnia czwartek, 19 maja 2005 05:58, we wiadomości
    DC offset is a average (voltage or current) of some waveform. DC offset
    causes constant flow of current. It may cause damage for some circuits,
    because constant current is non-essential in many applications, yet it
    produces a heat according to Joule-Lenz law. DC offset may also cause a
    breakdown for transistors gates or diodes (of course it it's to high -
    above breakdown voltage).
     
  5. Jamie

    Jamie Guest

    Hmm
    send Constant DC to something.
    in the case of speakers, a good way to
    heat the voice coil up.
     
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