SMD buzzer buzzer drive circuit problem?


buzzer is an electronic buzzer with an integrated structure. Its power comes from DC voltage. Widely used in computers, printers, copiers, alarms, electronic toys, automotive electronics, telephones, timers and other electronic products audio equipment. The 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 SMD buzzer small series of !
1. Buzzer
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
is essentially an inductive element, its current cannot be transient, so there must be a freewheeling diode to provide freewheeling. Otherwise, the two ends of the buzzer will produce a spike voltage of tens of volts, which may cause damage to the drive transistor and interfere with other important parts of the system that affect the entire design circuit.
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.
4. Triode
Triode Q1 plays a switching control role. The high level of its base causes the triode to be saturated and conduct, making the buzzer work and sound. The low level of the base enables the triode to be turned off, and the buzzer does not stop itself.
To sum up, this SMD buzzer is a small series about its drive circuit. I hope it can help you.

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