Basic piezo transducer drive circuit Adding Buffers to a Basic Piezo Transducer Drive Circuit It should be noted that the buzzer and circuit behave the same regardless of whether the one buzzer terminal is connected to the +V supply (as shown in the schematic) or to ground. However, it can be hampered by the fact that the voltage applied to the buzzer is limited to the supply voltage (+V) and the reset resistor dissipates power. The main advantage of this circuit is it only requires a few, inexpensive parts.
One of the most basic piezo transducer drive circuits is composed of an electronic switch, such as an FET or BJT, and a reset resistor as shown in the circuit below. It is also important to note that a transducer buzzer requires an external excitation signal, whereas an indicator buzzer, which contains an internal oscillator, only requires a supply voltage to operate. The amount of deformation and the resultant noise volume caused by the deformation are related to the voltage applied across the piezo material. However, as a quick refresher, a piezoelectric device is constructed of a material that physically deforms when a voltage is applied across the device. The basics of piezoelectric transducer buzzers are described in greater detail in CUI Devices’ Buzzer Basics blog post.
This blog outlines the working principles of piezo transducers, common design techniques for increasing audio output, and the advantages and limitations of each.
There are several ways to affect the audio output of a piezo buzzer based upon the design of the driver circuit. In most applications the reason for utilizing a piezoelectric transducer buzzer is to create a loud sound, where the amplitude of the sound produced by a buzzer is dependent upon both the specific buzzer selected and the signal used to drive the buzzer.
How Do I Maximize the Sound of a Piezo Transducer Buzzer?
0 kommentar(er)
