Polarity f/f

Discussion in 'General Electronics Chat' started by 50west, Jul 25, 2009.

  1. 50west

    Thread Starter New Member

    Jul 24, 2009
    1
    0
    How can I flip the polarity +12v or -12v when power is removed and then restored? IOW, let's say the output of my chip is -12v. I then turn the unit off. When I turn the unit back on, the output of the chip says +12v. Any suggestions? Thank you.

    west
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    What kind of power is involved? A latching relay with a power-up pulse to the coil is about the only way to do this.
     
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