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Piezo sensor as output using transistor

By Ashutosh Bhatt

Fig. 1: Image showing External Features of a Piezo Buzzer.

The generation of pressure variation or strain by the application of electric potential across a piezoelectric material is reverse of the piezoelectric effect. The circuit based project mentioned here uses this principle to use a piezo diaphragm as an output device. This is the concept used in commonly used piezo buzzers. As buzzers, they are also used in horns, telephone keypads, calculators etc. Shown below is an image of external features of a piezo buzzer.

[[wysiwyg_imageupload:7737:]]

Fig. 2: Image showing External Features of a Piezo Buzzer.

To get more information on how a piezo buzzer, catch its Insight on how a piezo buzzer works.

 

 


 

Lets get to know about the working of the project. The voltage drop across resistors R1(10k) and R2 (150k) is provided to the piezoelectric diaphragm. Due to the applied potential, the diaphragm starts vibrating. These vibrations are fed to the base of a transistor T1 (BC547). T1 acts as an amplifier to amplify these vibrations and the output appears across the collector resistor R3 (100). 

 

 

Circuit Diagrams

Piezo-sensor-as-output

Project Components

  • Resistor
  • Transistor BC547


Filed Under: Electronic Projects
Tagged With: piezo, sensor
 

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