buzzer is the role of an integrated electronic structure of the inquiry Xiangqi, using DC power supply voltage is widely used in computers, printers, copiers, alarm, electronic toys, electronic equipment, motor vehicles, telephones, timers, etc. Electronics products for voice devices.
Buzzer of the piezoelectric divided into two main categories buzzer-buzzer and two types of electromagnetic buzzer.
Beeper graphics symbols of the circuit in the circuit buzzer with the letters “H” or “HA” (to use the old standard “FM”, “LB”, “JD” and so on).
Piezoelectric buzzer piezoelectric buzzer by Multivibrator, buzz piezoelectric film, impedance matching and a resonance box, such as the composition of the shell. Some piezoelectric buzzer shell also equipped with light-emitting diodes.
Multivibrator by the transistor circuits or constitute. When connected to power after (1.5 ~ 15V DC voltage), multi-harmonic oscillator start-up, output of 1.5 ~ 2.5kHZ audio signals, impedance matching device to promote piezoelectric film audible buzz.
Piezoelectric buzz from film PZT niobium or lead-acid magnesium piezoelectric ceramic materials. In the ceramic-plated on both sides of the silver electrodes, the polarization and aging treatment, with brass or stainless steel tablets tablets stick together.
Electromagnetic electromagnetic buzzer by the oscillator, electromagnetic coils, magnets, vibration and the shell membrane, and other components.
Access to power, audio oscillator generated by electromagnetic currents through the coil, so that the resulting electromagnetic coil magnetic field. Diaphragm vibration in the electromagnetic coil and magnet interaction, periodically sound vibration.
