pin buzzer buzzer on the drive circuit of the problem?
buzzer is a structural integration of electronic buzzer. It is powered by DC voltage. It is widely used as a sound device in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers and other electronic products. Buzzer drive circuit generally consists of the following parts: a transistor, a buzzer, a freewheeling diode and a power filter capacitor. The following is a simple understanding of the pin buzzer Xiaobian!
The sound element can generate sound by applying a DC voltage or square wave across it. Its main parameters are shape size, sound direction, working voltage, working frequency, working current, driving mode, etc. You can choose according to your needs.
2. Freewheeling diode
The buzzer is essentially an inductive element, and its current cannot be transient, so there must be a freewheeling diode to provide freewheeling. Otherwise, a spike voltage of tens of volts will be generated at both ends of the buzzer, which may damage the drive transistor and interfere with other parts of the entire circuit system.
3. Filter capacitor
The function of filter capacitor C1 is to filter, filter out the influence of buzzer current on other components, and improve the AC impedance of the power supply. If possible, it is recommended to connect a 220uF electrolytic capacitor in parallel.
Triode Q1 acts as a switch. The high level of its base causes the triode to saturate and conduct, making the buzzer sound. The low level of the base turns off the triode and the buzzer stops sounding. The above
is the introduction of the pin buzzer . I hope I can help you.
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