low frequency buzzer

Discussion in 'General Electronics Chat' started by bazzakeen, May 12, 2015.

  1. bazzakeen

    Thread Starter New Member

    May 11, 2015
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    I am new to electronics, and would like to make a low frequency buzzer.
    is it possible to wire a capacitor in series with a resister to produce a pulse that would drive a piezo,
    would this work? if its feasible, any advice about values would be much appreciated,

    Bazza
     
  2. ScottWang

    Moderator

    Aug 23, 2012
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    What do you do for the piezo?
     
  3. bazzakeen

    Thread Starter New Member

    May 11, 2015
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    Think its a piezo, taken from a personal alarm, cant see any internal components but when power supplied it makes a horrendous squeal,
    can't see any identífication numbers or marks on it.
     
  4. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    You can produce a pulse with those components, but how is that useful in making a buzzer?
     
  5. bazzakeen

    Thread Starter New Member

    May 11, 2015
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    thought maybe I could drive a buzzer as previously described with a pulse, so to be able to adjust frequency.
    guess your telling me it wouldn't work.

    Bazza
     
  6. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    Clearly this sounder is not just a piezo element, it must have a built-in oscillator with a fixed frequency. It probably isn't practical or even possible to change that frequency so the best solution, if you need a low-frequency buzzer, is to buy a low-frequency buzzer.
     
  7. bazzakeen

    Thread Starter New Member

    May 11, 2015
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    Thanks for your time and expertise, it was just a thought,

    Bazza
     
  8. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    If you really want to make a buzzer, you will need to build an oscillator. Probably the most common approach is to use a 555 timer chip in astable mode, the 555 can deliver enough current to drive a low impedance loudspeaker directly.
     
  9. dl324

    Distinguished Member

    Mar 30, 2015
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    You can buy piezo buzzers in at least a few frequencies; just supply power...

    Like this one: http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_1956741_-1
    Though I no longer buy parts from Jameco, I still use them for information...
     
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