How to transit between main and battery power

Discussion in 'The Projects Forum' started by witssq, Apr 8, 2012.

  1. witssq

    Thread Starter Active Member

    Mar 29, 2009
    48
    0
    Please advise how to transit from main power(3.3VDC) to battery power when main power on, vice versa. as computer does.
    I would like to rtc clock such as personal computer.

    Thanking you in advance.
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,446
    3,362
    Use a Schottky diode such as 1N5817 between the main power and the battery powered circuit.
     
  3. panic mode

    Senior Member

    Oct 10, 2011
    1,320
    304
    you mean switch from main to battery power when main power is off
    why would you want to run on battery when main power is present. ;)
     
Loading...