How long on battery

Discussion in 'General Electronics Chat' started by FroceMaster, Mar 10, 2012.

  1. FroceMaster

    Thread Starter Member

    Jan 28, 2012
    401
    4
    HAve a circuit, use 3-8 ma,
    3 when lights is out, and 8 when lid.
    blink every second,

    How long will 3 * 1,5 v AA battery hold the circuit running ?
    And if replacing by a 9v battery and a 78L05 ?

    Rgds
    ForceMaster
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,365
  3. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    An old 78L05 regulator uses a maximum current of 6mA when it is not doing anything.
    Use a modern 5V regulator instead that has a very low current.
     
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