Zero-Crossing question

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  1. - 4th July 2012, 15:57 #6
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    sayzer
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    Default Re: Zero-Crossing question

    Quote Originally Posted by Ioannis View Post
    My concern is for the heat dissipation from the 5W resistor.

    Maybe the secondary of the tranformer can be used with lower waste of energy.

    Ioannis

    The circuit in the link is a concept.
    Designer can work around it.

    And yes; a transformer say with a 9V secondary, can also work.
    In that case, have the zero cross input from there.

    If no transformer will be used, then transformerless power supply concept can also work.
    Long missed Melanie had a post for transformerless power supply here post #5.
    You may get some ideas from her schematic.
    Last edited by sayzer; - 4th July 2012 at 16:02.
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