| 摘要 |
PURPOSE: A volume adjusting apparatus of a buzzer is provided to reduce additional cost and time and the layout of the entire circuit by adjusting the volume of the buzzer conveniently with modifying the circuit simply without additional circuits. CONSTITUTION: A volume adjusting apparatus of a buzzer is composed of a power applying unit(30) applying power to the buzzer; a power varying unit(40) deciding application of power from the power applying unit to the buzzer, and adjusting the volume of the buzzer by varying driving power to the buzzer; and a driving control unit(50) connecting to the buzzer, and driving the buzzer with the specific frequency by turning on and off the buzzer according to the pulse signal with the predetermined duty. The power applying unit has a resistor connected between the end of the buzzer and the power applying unit in series and in parallel, and a capacitor connected to the resistor in series. |
