generate 3.3V from only Line signal.

Discussion in 'General Electronics Chat' started by firend, Jan 29, 2016.

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  1. firend

    Thread Starter Member

    Feb 18, 2012
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    Hi everyone.
    I want to generate 3.3V dc volatge from only line signal 220V. I have a circuit but I don't understand principle operation. I attached file schematic.
    does anyone explain about principle operation?
    Thank in advance.
     
    Last edited: Jan 29, 2016
  2. absf

    Senior Member

    Dec 29, 2010
    1,493
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    It should be FQD6N50C by fairchild and the datasheet is here.

    Allen
     
  3. firend

    Thread Starter Member

    Feb 18, 2012
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    0
    Thank you. I use microscope to look. I draw schematic from board circuit.
    Can you explain principle operation for me?
     
  4. absf

    Senior Member

    Dec 29, 2010
    1,493
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    Are you connected 220V AC directly to your circuit without going through a transformer? I am afraid this thread would be closed because we're not allow to discuss mains without step down or isolation transformers.

    Allen
     
  5. ScottWang

    Moderator

    Aug 23, 2012
    4,855
    767
    The owners of All About Circuits has elected not to host discussions of transformerless threads.

    Transformerless powersupplies are not allowed over here.
    See point 6 of the user agreement:
    http://www.allaboutcircuits.com/user-agreement/

    If you wish to change to using the transformer to discuss then please press report, when our mods through the discussion if we decide to reopen it then we will reopen.

    Good luck.
     
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