Piezoelectric buzzer is a piezoelectric ceramic as the electroacoustic transducer sound generator, the core of this device is a piezoelectric ceramic sheet affixed to the metal piece of the transducer, that is, the piezoelectric buzzer. Piezoelectric buzzer without radio frequency noise, low power consumption and other characteristics make it highly valued, the development is very rapid.
Basic introduction Chinese name: piezoelectric buzzer Output audio signal: 1.5 ~ 2.5kHZ Structure principle, product properties, drive method, features, set, structure principle Piezo buzzer is mainly composed of a polytuned oscillator, piezoelectric buzzer, impedance matching and **** sound box, shell and so on. Multi-tuned oscillator by the crystal or cumulative circuit composition, when the power supply (1.5 ~ 15V DC operating voltage), multi-tuned oscillator vibration, the output of 1.5 ~ 2.5kHZ audio signal, impedance matching device to promote the piezoelectric buzzer sound. Product Attributes Driving method: If you can't provide the frequency signal to the buzzer, you can consider using the built-in driving circuit, and give the DC voltage can be. Another straight tone, fast break tone, slow break tone different sound signal Size: size will affect the frequency, small size frequency will be higher Voltage: VO-P calculation, square wave drive, the higher the voltage, the higher the volume pinpitch: piezoelectric buzzer specifications, often not easy to find exactly the same specifications, you can first pick the same pitch, close to the frequency of the trial. Driving method Piezo buzzer can be driven by the driving circuit, there are two methods as follows: self-excited oscillation is the use of oscillation at the resonance point of the way to generate sound waves; other excited oscillation is away from the resonance point of the frequency of the way to generate sound waves. Characteristics of piezoelectric buzzer and other buzzers have the following advantages: 1, because there is no movable contact part, so long life, high reliability, continuous use of up to 10,000 hours or more, is a semi-permanent device 2, does not produce flying arcs or radio frequency noise, no interference with other lines 3, will not cause large vibrations due to the loosening of the 4, with the electronic control, so it can emit a variety of pleasing sounds and analog sounds, intermittent sounds. The sound is pure and not easily affected by noise. Pure tone, not easy to be covered by noise 5, with voltage excitation, so the current consumption is small, generally below 20mA, will not exceed 100mA 6, small volume. Volume can reach 70dB/20cm, and the thickness of the component is only 1mm or less 7, a wide range of operating temperatures 8, easy to install, and no electromagnetic coils and moving coils, do not have to worry about insulation deterioration, and no possibility of leakage Set Piezoelectric buzzer in fact, there are three forms of commercial products, namely, the piezoelectric buzzer composite, piezoelectric buzzer sound generator and the piezoelectric buzzer to adapt to the market to meet the different needs of the different needs. Regardless of the form, its use is inseparable from the alarm, judgment and notification of the three. Alarm piezoelectric buzzer for fire, smoke concentration, gas leakage, burglary and automotive alarm, notify the piezoelectric buzzer in the fish finder, instruments, medical equipment, vending machines, washing machines, electric stoves and so on as a notification of the use of the more favorable than the light instructions, in addition, with an analog sound, composite sound of the piezoelectric buzzer can be used for toys, TV games and other aspects.