Isolating PIC input from high voltage

Discussion in 'Embedded Systems and Microcontrollers' started by mohdroos1, Nov 21, 2008.

  1. mohdroos1

    Thread Starter New Member

    Nov 21, 2008
    1
    0
    thanks for you all
    i am working on graduation project and calculating power is a part of it .
    i need to connect isolator to protect PIC from high voltage.
    i have question about how to connect isolator to protect PIC from high voltage.
    i used 4n26 IC but it doesn't work ...

    i used a voltage divider to minimize voltage and shunt resistor to sense current
    help please
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Welcome to AAC.

    We prefer you to start a new thread for each question. Continuing a previous discussion with a different topic is confusing. Thia is the original thread - http://forum.allaboutcircuits.com/showthread.php?t=12381&page=3.

    Not only do you have to keep from applying too much voltage to the input, you also have to insure safety by galvanic isolation. Thia is best done with a transformer. A step down transformer provides a much lower voltage to work with that is also directly related to the input voltage.
     
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