Patent ID: 8437484

Claim:
An electronic device, comprising: a speaker for emitting sounds according to a right channel audio signal and a left channel audio signal; an audio power amplifier used for outputting the left channel audio signal and the right channel audio signal, the audio power amplifier comprising a control pin enabling the audio power amplifier to be electrically connected to the speaker, the control pin activated at a low level and disabled at a high level; an earphone jack assembly comprising: a first input port for inputting the left channel audio signal; a second input port for inputting the right channel audio signal; a first connection port capable of being electrically connected to the first input port; and a second connection port capable of being electrically connected to the second input port, the second connection port electrically connected to the first connection port; and a switching circuit capable of enabling the control pin switching between the low level and the high level, the switching circuit comprising: a power supply; a first resistor, one end of the first resistor electrically connected to the second input port, and the other end of the first resistor electrically grounded; a second resistor, one end of the second resistor electrically connected to the second connection port and the other end of the second resistor electrically connected to the power supply; a third resistor, one end of the third resistor electrically connected to the control pin, and the other end of the third resistor electrically grounded, the resistance of the third resistor far exceeding that of the first resistor; and a diode, a cathode of the diode electrically connected to the control pin, and an anode of the diode electrically connected to the power supply.