switch on delay circuit

Discussion in 'The Projects Forum' started by deoj, May 9, 2011.

  1. deoj

    Thread Starter New Member

    May 9, 2011
    1
    0
    Hello

    guys can you help me start my project.
    my project is Power on delay circuit
    i need schematic and pcb layout for it

    just a simple Power on delay circuit

    any comments and suggestion is much appreciated :)
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    For starters..Details...details...details!

    What voltage are you intending to switch?
    AC or DC?
    How much current?
    How long a delay

    Ken
     
  3. simo_x

    Member

    Dec 23, 2010
    200
    6
    If You want a power on after an N time delay, you can use a a simplest 555 monostable circuit to obtain a more precise delay.. At pin 3 you can connect a NPN inverter and then work with the inverter output, if you work with DC.
    An RC network also would be usefull, but , if you use an NPN after it, you need to be more precise with voltage & time charge of capacitor to active the transistor..
     
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