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Help: Double Beeper Circuit

Discussion in 'Electronic Design' started by Darrin, Apr 29, 2004.

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  1. Darrin

    Darrin Guest

    Hi,
    I am looking for a Beeper Circuit (using a Piezo Buzzer/Sounder) which when
    triggered should produce two beeps (pip-pip) every 5 seconds. Will prefer a
    circuit using dual-timer 556 or CMOS/ TTL logic gates. Any help
    appreciated - Tks
     
  2. Does the Piezo Buzzer/Sounder produce its own sound from a DC input?
    If so, what voltage? Or does the circuit have to generate the audio
    signal as well as the pulses?

    Each beep presumably about 200ms duration, and about 1kHz frequency?
    Presumably something like 100ms interval between the two pulses?

    Triggered by what?
     
  3. Darrin

    Darrin Guest

    My comments as below:

    They usually work from 1.5v to 12v DC.
    pulses?
    NO. The piezo buzzer produces the audio when the voltage is applied.
    Should be Ok, I suppose. The question of audio frequency does not arise as
    we
    are not generating the audio. We are merely turning on/ off the piezo buzzer
    as desired.
    Even shorter will do I suppose. Ideally what I am looking at is
    "pip-pip-5ms delay-pip-pip-5ms delay-pip-pip-5ms delay..."
    I am interfacing this with a digital logic circuit and when the data output
    lines have a specific value I would like the beeper to be triggered. This
    can be a logic high or low.
     
  4. OK, based on that clarification I've suggested an approach at
    http://www.terrypin.dial.pipex.com/Images/Beeper-Darrin1.gif

    I'm leaving on a short trip so don't have time to produce a detailed
    schematic, just that outline. But it should be fairly straightforward.

    The circuit would use two 555s (or a single 556), plus a 4017. Like
    CFoley1064, that would be my preferred aproach. If you have
    difficulties and they aren't resolved by others meanwhile, I'll take
    another look at it after my return on Tuesday.

    It's also very likely that there's a more elegant solution someone
    will produce <g>.

    Pip-pip for now.
     
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