ultrason generator

Discussion in 'Homework Help' started by TomJoad, Dec 11, 2013.

  1. TomJoad

    Thread Starter New Member

    Dec 9, 2013
    5
    0
    Hi everyone,
    I need a filter that generats a signal for 4mins and don't generat it for 5 mins,
    can i do it with two astables with 555 ?
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,967
    744
    Yep, one set to give the tone , the other set to 4 mins on. 5 mins off astable.

    Or if you dont need to generate the tone, use one 555.
     
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