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Simple Timer Circuit.

Discussion in 'Hobby Electronics' started by DD, Aug 31, 2004.

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  1. DD

    DD Guest

    I need a very simple 2 hour timer to remind me to take my medications.
    I have made up a lot of circuits from electronic magazines so I feel
    confident that I could make something up provided that I have the same
    level of instructions. The timer needs to be small enough to carry
    unobtrusively in a pocket and the indication of the end of the 2 hour
    period would preferably be by vibration but an audible signal would be
    better than visual. Accuracy is not an issue, +/- 5 minutes would be
    adequate. If I could buy one ready made that would be nice but I like to
    make things if I can!
    Any suggestions?

  2. How about using an old mobile phone
    for your alarm/vibration timer.
    John Crighton
  3. And there are many digital watches with a count down function that could be
    set to 2hrs or whatever.
  4. Desmond Wong

    Desmond Wong Guest

    I think there were some shops like Jaycar or DSE that had a "parking Timer"
    which was set at about the 2 hour mark from memory that could do what you

  5. Joerg

    Joerg Guest

    Hi DD,

    You could do that with a CD4060 chip. It has a built-in oscillator and a
    14 stage divider, all in one chip. Power consumption is minimal and it
    tolerates a wide fluctuation in battery voltage, so you don't have to
    regulate much. Of course it all depends on how precise you want the
    two-hour timing.

    Good Day, Joerg
  6. DD

    DD Guest

    Sounds good but I would need some very explicit instructions if I were
    to attempt to make up a timer. Thanks for the suggestion though.

  7. DD

    DD Guest

    Jaycar have one of these listed new for 2004 and at $9.95 it is looking
    Thanks for the suggestion.

  8. Joerg

    Joerg Guest

    Hi DD,

    You might also take a look at wrist watches at a really large store. I
    have seen some with multiple alarm programming modes, including regular
    alarms. I think it was for some sports purpose. Maybe they have one that
    can be set to beep every two hours until you acknowledge by pressing the
    silence button. This way you wouldn't have to carry any additional
    device around.

    Regards, Joerg
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