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Beeper timer , 555 ?

Discussion in 'Electronic Design' started by Phil, Jan 12, 2008.

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  1. Phil

    Phil Guest

    I have need for a timer that would be used to turn a 12 v. beeper device
    on for one second or less and then off for 10- 30 seconds and then back to
    beeper , looked at a bunch of 555 IC circuits and hate to spend a day
    experimenting to get the right combo. , as an old HAM , I used to love the
    challenge , even looked at using a timed relay , most of the 555 circuits
    are 50/50 and that won't do , any ideas would be appreciated .
    Phil L.
  2. Frank Buss

    Frank Buss Guest

    A good idea would be to read the datasheet, e.g. this one:

    Then take a look at the schematic at page 9 and the formulas at page 10 for
    the duty cycle.

    For more flexibility and one-chip solutions (you'll need two 555s for your
    application) you can use a microcontroller.
  3. Fred Bloggs

    Fred Bloggs Guest

    That would be something like this:
    View in a fixed-width font such as Courier.
  4. Hot Jock

    Hot Jock Guest

    A 556 would be a one-chip solution!
  5. Frank Buss

    Frank Buss Guest

    Yes, and maybe the cheapest solution, too, if you don't need more
    flexibility of a microcontroller. The advantage of a microcontroller would
    be that there are some chips with integrated oscillator, which means that
    you don't need any external component. The 556 solution needs many external
    resistors and capacitors.
  6. John Fields

    John Fields Guest

  7. Frank Buss

    Frank Buss Guest

    My understanding of the OP was, that he needs to generate the square wave
    for the beeper, too.
  8. John Fields

    John Fields Guest

    There is no need for a 556, and the slick 555 solution needs exactly
    one 555, two resistors, one capacitor, and one diode.

    The µC solution you propose needs one µC, one device programmer and,
    depending on how smart one is, a more or less huge effort required
    to climb the learning curve the first time out.

    Also, note that Fred Bloggs posted a circuit which will work when
    assembled with the components shown while you haven't even offered a
    suitable µC or posted code which would do the job.
  9. donald

    donald Guest

    One 555 would do it as there seems to be no requirement to toggle the
    beeper device.

    However there seems to be a requirement to control the OFF time.

    So a pot would be nice addition.

    Also, the 12V beeper is most likely a high current device.

    I also noticed that the OP has not chimed in yet.

  10. Fred Bloggs

    Fred Bloggs Guest

    Right, well you can invert the duty cycle, parallel some 555 outputs,
    and add adjustment like so:
    View in a fixed-width font such as Courier.
  11. neon


    Oct 21, 2006
    you need two timers one for the on-off and one for beeping frequency a 556 is the choice then as sugested.
  12. Phil

    Phil Guest

    Thanks for all the info. , I have built many 555 pulsers to run servos etc.
    , I have enough schematics now to go with , had something in my basement
    that required an alarm , just didn't want it on solid and drive me out of
    the house , thanks to all for your thoughtful comments , I love the NG 's
    and wonder why more folks don't use them ?.
    Best To All
    Phil L.
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