Buzzer circuit
AssigneesHong Fu Jin Precision Industry (Wuhan) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
InventorYONG-ZHAO HUANG
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Abstract
A buzzer circuit includes a control unit, a constant current unit, and a buzzer. The buzzer circuit is coupled to a drive circuit. The buzzer includes a power pin and a ground pin. The constant current unit includes a constant voltage component and a first resistor. When the power pin of the buzzer receives a high level drive signal, the constant voltage component provides a constant voltage, controlled by the control unit, to the first resistor, and the ground pin is coupled to ground through the first resistor, and the buzzer buzzes steadily.
Claims6
A buzzer circuit coupled to a drive circuit, the buzzer circuit comprising:
- a buzzer comprising a power pin and a ground pin, wherein the power pin is coupled to the drive circuit for receiving a drive signal from the drive circuit;
- a constant current unit comprising a constant voltage component and a first resistor;
- and
- a control unit coupled between the buzzer and the constant current unit;
- the buzzer circuit configured such that when the power pin of the buzzer receives a high level drive signal, the constant voltage component provides a constant voltage, controlled by the control unit, to the first resistor, and the ground pin is coupled to ground through the first resistor.
Dependencies are inferred from the claim text.