From: scientist77017@gmail.com   
      
   On Monday, May 20, 2019 at 4:48:52 PM UTC-5, default wrote:   
   > On Mon, 20 May 2019 12:20:32 -0700 (PDT), AK   
   >  wrote:   
   >   
   > >I got this, but saw no polarity markings like my other larger piezo buzzer.   
   > >   
   > >Andy   
   > >   
   > >Piezo Transducer   
   > >Electrical Specifications:   
   > >   
   > >    Rated Voltage: 5Vp-p   
   > >    Rated Current: 2mA (max)   
   > >    Sound Output at 10cm: 85 dBA   
   > >    Resonant Frequency: 2.04kHz   
   > >    Dimensions: 8.43mm H x 12.1mm diameter   
   > >    Number of pins: 2   
   > >    Pitch: 6.5mm   
   > >    Lead thickness: 0.62mm   
   > >    PC mount   
   > >    Markings: 12RT04CC   
   >   
   > It is not a buzzer, it is a transducer.   
   >   
   > A transducer is a device that can convert (in this case) sound to   
   > electricity or electricity to sound.  To use that as a buzzer you will   
   > need to drive it with an oscillator, at 2.04 kilo hertz and a wave   
   > with a 5 volt peak to peak amplitude (to get the maximum noise out of   
   > it)   
   >   
   > It doesn't have the polarity indicated because it has no polarity.   
   > Think of it as a loudspeaker (another transducer since they can be   
   > used as microphones and convert sound to electricity)   
   >   
   > It will work at other frequencies with less volume.  It should click   
   > when you put a battery on the leads, and click again when you reverse   
   > the polarity of the battery.  (it also stores a charge like a   
   > capacitor)   
   >   
   > Look up oscillators if you want to use it as a buzzer.  The 555 makes   
   > a dandy oscillator.   
      
   Ok. I want to replace the current piezo buzzer I have with something that will   
   fit on my breadboard.   
      
   It's a pulse type which I do not like.   
      
   Andy   
      
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