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zero crossing detector circuit using lojic gates

Discussion in 'General Electronics Chat' started by ricepatties, Sep 12, 2008.

  1. on1aag

    on1aag New Member

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    Here's another example:

    [​IMG]

    on1aag.
     
  2. BeeBop

    BeeBop Active Member

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    Vancouver Canada
    There should be a few tutorials on this page:
    http://www.opencircuits.com/Eagle_Links
    as well as lots of other helpful hints, etc.
     
  3. Boncuk

    Boncuk New Member

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    Phetchabun,Thailand
    Hi on1aag,

    do you think the "Trappenhuisautomaat" takes care of zero detection?

    It is designed for pure resistive loads like light bulbs in a stair case and so zero detection isn't necessary.

    BTW, I've learned some Dutch too. Here's an example and the teacher said it's wrong: "En olifant op en paard", while "En meisje op en paard" is OK for him.

    Boncuk
     
  4. dave

    Dave New Member

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  5. Willbe

    Willbe New Member

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    Not if you want to ward off GeekHood.
     
  6. on1aag

    on1aag New Member

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    Hi Hans,

    The line synchronisation is needed to reduce the current
    consumption of the circuit. The triac is fired with a
    short pulse at the right time and at the right angle to
    reduce the current consumption to a fraction of the 5 mA
    which is needed to trigger the triac at all angles.
    The synchronisation also prevents line disturbances when
    the load is switched on.
    Using a small transformer was out of the question because
    those small transformers (< 5 VA) tend to go open circuit
    at the primary.
    Please bear in mind that this circuit was designed more
    than thirty years ago by a newly graduate.

    on1aag.
     
    Last edited: Sep 15, 2008

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