Time delay

Discussion in 'Homework Help' started by narpz24, Aug 20, 2013.

  1. narpz24

    Thread Starter New Member

    Aug 20, 2013
    1
    0
    i would like to build a circuit with a time delay function (5sec). a signal input and then a signal will be output after 5 sec.

    requirements are:
    12vdc power source
    using CMOS 4011 , capacitor, resistor

    can you help me??
    thank you in advance!
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,509
    2,369
    Search for 555 timing circuits, more than you need.
    Max.
     
  3. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,157
    Read http://www.allaboutcircuits.com/vol_1/chpt_16/2.html

    More advice than the OP needs for the Homework section. Good advice for the General Electronic Chat or the Project Forum sections though. Different sections dictate different advice.
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    As Joe suggested to look at the RC timing, I would suggest to look at the 4011 transfer characteristics:

    [​IMG]

    Bertus
     
  5. WBahn

    Moderator

    Mar 31, 2012
    17,716
    4,788
    First, note that this is Homework Help, so we expect you to show the work YOU have done to attempt to solve YOUR homework problem.

    Having said that, a good place to start is a sketch of what you want your output to look like, as a function of time, as the inputs are applied. Since you only have one input, this can be pretty simple. For an input signal use short pulses (say 2s) and long pulses (say 8s) and then construct a pulse train that has then separated by short delays (say 2s) and long delays (say 8). The goal is to be able to look at your pulse train and identify all of the possible combinations somewhere in the train, for instance a long delay followed by a short pulse followed by a short delay. Then go along and decide what you want/need the output to be given this input sequence.

    Try to put something like that together and post it. This will go a long way to making sure that everyone starts out on the same page.
     
Loading...