Electronic device and audio output circuit thereof

An electronic device and audio output technology, applied in the direction of transducer circuits, electrical components, sensor components, etc., can solve problems such as crashes and affect product quality, and achieve the effect of eliminating crashes

CN104349239AInactive Publication Date: 2015-02-11HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-02-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

An audio output circuit applied in an electronic device includes a filter capacitor and a transistor. A base of the transistor is connected to an audio processing unit, an emitter of the transistor is connected to a voltage port, a processor and an earphone detecting unit of the electronic device is electrically connected to a collector of the transistor. The filter capacitor is connected between the base of the transistor and the ground. The filter capacitor filters the audio signals generated by the audio processing unit, to ensure that and the transistor is always turned on.
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Description

technical field

[0001] The invention relates to an electronic device and its audio output circuit, in particular to an electronic device and its audio output circuit for preventing the electronic device from crashing when the output volume is too high. Background technique

[0002] When the existing DVD player does not utilize the earphone output, if the output sound is too high, the general assembly will crash, which affects the product quality. Contents of the invention

[0003] The invention provides an electronic device and its audio output circuit.

[0004] An electronic device includes an audio processing circuit, a central processing unit and an earphone detection circuit, the audio output circuit includes a first resistor, a second resistor, a third resistor, and a triode, wherein the first resistor , the second resistor, and the third resistor all play the role of voltage division. The audio output circuit also includes a filter capacitor, one end of the first r...

Examples

Embodiment Construction

[0012] see figure 1 , is a circuit diagram of an audio output circuit of an electronic device in a preferred embodiment of the present invention. The audio output circuit 20 is connected with an audio processing circuit 10 , a central processing unit 30 and an earphone detection circuit 40 . The audio output circuit 20 is used to output the audio signal generated by the audio processing circuit 10 , and output the audio signal through an earphone (not shown) or directly. In general, the audio signal generated by the audio processing circuit 10 may include audio signals of various frequencies, such as a 1khz audio signal.

[0013] The audio output circuit 20 includes a first resistor 201 , a second resistor 202 , a third resistor 203 , a diode 204 , a transistor 205 and a filter capacitor 206 .

[0014] One end of the first resistor 201 is connected to a 3.3V voltage source, and the other end is connected to the audio processing circuit 10 and the second resistor 202 . The d...