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Piezoelectric buzzer principle, selection and application
The piezoelectric buzzer is a sounding body using a piezoelectric ceramic as an electroacoustic transducer. The core of this device is a piezoelectric transducer chip that is attached to a metal plate and is a piezoelectric buzzer. Piezoelectric buzzer has attracted much attention due to its features such as non-radio frequency noise and low power consumption. The development is very rapid.
Piezoelectric buzzer structure principle
The piezoelectric buzzer is mainly composed of a multivibrator, a piezoelectric buzzer, an impedance matcher, a resonance box, a housing, etc. The multivibrator is composed of a transistor or an integrated circuit and is connected to the power supply (1.5 to 15V). DC operating voltage). The multivibrator starts to vibrate and outputs an audio signal of 1.5-2.5kHZ. The impedance matcher pushes the piezoelectric buzzer sound.
Piezoelectric buzzer selection
Drive mode: If the frequency signal cannot be provided to the buzzer, consider using the included drive circuit to give the DC voltage. In addition, there are different sound signals for direct sound, quick sound and slow sound
Dimensions: Size will affect frequency, small size frequency will be higher
Voltage size: calculated by V OP, driven by square wave, the higher the voltage, the higher the volume
Pin pitch: The piezoelectric buzzer has many specifications, and it is often difficult to find exactly the same specifications. You can pick the pitch first, and the frequency is close to the test.
Piezoelectric buzzer drive
Piezoelectric buzzers can be driven by a driver circuit in two ways:
Self-oscillation is a method of generating sound waves by utilizing the oscillation at the resonance point
He-induced oscillations are the way to generate sound waves at frequencies far from the resonance point.
Piezoelectric buzzer application
Piezoelectric buzzer actually has three commercial forms, namely piezoelectric buzzer complex, piezoelectric buzzer sounding body and piezoelectric buzzer to meet different needs in the market. Regardless of the form, its use cannot be separated from three kinds of alarms, judgments and notifications.
Piezoelectric buzzer for alarm is used for fire, smoke concentration, gas leakage, anti-theft alarm, and alarm for automobiles. Piezo buzzer for notification is used as a notification for fish finder, medical equipment, vending machine, electric furnace, etc. It is more advantageous than the light indication. In addition, the piezoelectric buzzer with analog sound and compound sound can also be used in toys, video games and so on.