Hon Hai Precision Industry Co., Ltd.

Hong-fu Jin Precision Industry (shenzhen) Co., Ltd.

Foxconn Technology Co., Ltd.

Fu Zhun Precision Industry (shen Zhen) Co., Ltd.

Shao-Lin Zhang

Chun-Lung Hung

Kun Huang

De-An Zhang

Chin-Long Ku

Jie Liu

Lung Dai

Wen-Ming Chen

Huai-Qing Zheng

An audio device includes an internal sound producer, an earphone jack, a detection circuit, a volume adjustor, and an amplifier. The detection circuit detects a connection between the earphone jack and an external sound producer, generates a first state signal when the connection is established, generates a second state signal when no connection is established. The volume adjustor is preset with first predetermined volume levels and second predetermined volume levels, generates first adjustment signals based on the first predetermined volume levels in response to the first state signal, and generates a second adjustment signal based on the second predetermined volume levels in response to the second state signal. The amplifier amplifies audio signals and adjusts the volume of the amplified audio signals according to the adjustment signals, then sends the amplified audio signals to the internal sound producer and earphone jack.

Audio device and volume adjusting circuit for the audio device

An LED illumination system includes an LED lamp, a voltage stabilizing circuit and a control circuit. The LED lamp includes an LED string which has a plurality of LEDs connected in series. The voltage stabilizing circuit connects the LED lamp for supplying an electric current to the LED string. The control circuit includes an MCU and a MOSFET connected between the MCU and the LED string. The MCU detects the electric current flowing through the LED string and outputs a PWM signal which has a frequency within a range from 60 Hz to 500 Hz to the MOSFET. The MOSFET receives the PWM signal from the MCU and turns on and off repeatedly under a control of the PWM signal, to make a flicker frequency of the LEDs of the LED string be within a predetermined range.

Light emitting diode illumination system

An audio device includes a jack, a switch, an amplifier, an internal sound producer, and a determining circuit. The jack establishes a connection with an external sound producer. The switch is in an opened state when the connection is established, and in a closed state when the connection is open. The amplifier amplifies audio signals to amplified audio signals and sends the amplified audio signals to the switch. The determining circuit receives the amplified audio signals from the switch, and generates a high voltage to control the amplifier not to output the amplified audio signals to the internal sound producer when the switch is in the closed state, and generates a low voltage to control the amplifier to output the amplified audio signals to the internal sound producer. The determined circuit further filters out the amplified audio signals when the switch is in the opened state.

Audio device

An audio apparatus includes an input, a first resistor, a first capacitor, an amplifier, a second resistor, a second capacitor, and an output. The input is used for inputting audio signals. The first resistor and the amplifier are serially connected to the input; wherein the first resistor is connected to the inverting input of the amplifier and the non-inverting input of the amplifier is connected to ground. The first capacitor has one end connected to a node between the first resistor and the inverting input of the amplifier, the other end connected to ground. The second resistor has one end connected to a node between the first resistor and the inverting input of the amplifier, the other end connected to the output of the amplifier. The second capacitor is connected between the inverting input and the output of the amplifier. The output is connected to the output of the amplifier, for outputting the audio signals after processing.

Audio apparatus

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Shenzhen, China

Shao-Lin Zhang