From: jeroen@nospam.please   
      
   On 2019-05-20 21:20, 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 expects to be driven by an alternating voltage. If you   
   connect it to a DC source, a battery for example, it will   
   just go *tick!*.   
      
   Jeroen Belleman   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)