need help in power electronics based blinker

Discussion in 'The Projects Forum' started by shankarNITIAN, Apr 11, 2009.

  1. shankarNITIAN

    Thread Starter New Member

    Mar 16, 2009
    5
    0
    http://www.scribd.com/share/upload/10788385/12mvfg4erw04i2xouv8l


    please help me know the use of triac and opto-coupler in this circuit.
    the opto coupler is used for switching purposes with isolation,then why is theere no ground in the astable mode operated multivibrator(555 ic) .
    please give a overview of how this circuit works!!!!!
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    There is ground.

    Why you say that?
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The circuit is bad news as it uses the line for power. If you use a 12 volt wall transformer to power the 555, it will function the same way, and be safe to use.
     
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