Abstract: An electronic device includes an earphone port, an audio amplifier, a digital processor, a multi-way selection switch, and an earphone detection response circuit. The earphone port includes left and right channel pins. The audio amplifier includes an earphone left channel output pin and an earphone right channel output pin. The digital processor includes a data transmission pin and a data receive pin. The multi-way selection switch includes four switches electrically connected between the data transmitting pin and the left channel pin, the data receive pin and the right channel pin, the earphone left channel output pin and the left channel pin, and the earphone right channel output pin and the right channel pin, respectively. The earphone detection response circuit turns on a first switch and a second switch, and turns off a third switch and a fourth switch when the earphone port does not receive an earphone.

Abstract: An electronic device includes an earphone port, an audio amplifier, a digital processor, a multi-way selection switch, and an earphone detection response circuit. The earphone port includes left and right channel pins. The audio amplifier includes an earphone left channel output pin and an earphone right channel output pin. The digital processor includes a data transmission pin and a data receive pin. The multi-way selection switch includes four switches electrically connected between the data transmitting pin and the left channel pin, the data receive pin and the right channel pin, the earphone left channel output pin and the left channel pin, and the earphone right channel output pin and the right channel pin, respectively. The earphone detection response circuit turns on a first switch and a second switch, and turns off a third switch and a fourth switch when the earphone port does not receive an earphone.

Abstract: An exemplary integrated printed circuit board (PCB) includes a main PCB and a peripheral PCB. The main PCB includes a number of general purpose input/output (GPIO) ports and a number of first bonding pads, the bonding pads are located on edges of the main PCB and each GPIO port is electrically connected to one of the first bonding pads. The peripheral PCB includes a receiving space and a number of second bonding pads, the receiving space is used to receive the main PCB, the second bonding pads are located at inner peripheral edges of the peripheral PCB surrounding the receiving space. When the first bonding pads of the main PCB are respectively welded with the second bonding pads, the main PCB and the peripheral PCB are connected to each other to form the integrated PCB. An electronic device incorporating an integrated PCB is also provided.

Abstract: An electronic device with a multifunctional universal serial bus (USB) port is provided. The electronic device includes a USB port, a processing unit, a power module, a master-slave response module, and a power control module. The master-slaver response module is connected between the USB port and the processing unit, and is used to produce a corresponding trigger signal to the processing unit according to a type of an external device connected to the USB port. The power control module is connected between the power module and a voltage pin of the USB port. Therein, the processing unit disables the power control module when receiving a first trigger signal. The processing unit enables the power control module to output the power to the power pin of the USB port when receiving a second trigger signal, thus to power the external device.

Abstract: A power source connecting device includes an adapter, a rail and a plurality of power cables. The adapter connected to an external power source converts the alternating current output from the external power source to direct current. The rail electrically connects to the adapter. One end of each of the power cable connected to an electronic device, and another end of each of the power cable connects to the rail and is configured for slide along the rail together with the electronic device. The power cable remains in electrical connection with the rail during the sliding.

Abstract: An electronic device includes a main body, a solar panel rotatably coupled to the main body, a driving mechanism for rotating the solar panel to different orientations, a detecting unit for detecting intensities of the sunlight received in different orientations, and a processor. The processor compares the detected intensities to determine a greatest intensity, and controls the driving mechanism to rotate the solar panel to an optimal orientation for a short period of time. A charging method implemented by the electronic device is also provided.

Abstract: An electronic device includes a power supply, a key module, a signal generating module, a first control module, and a second control module. The key module generates a corresponding pressing signal in response to a pressing operation of a user. The signal generating module is powered by the power supply and generates a wake-up signal in response to the pressing signal. The first control module powered by the power supply. The second control module is being enabled to communicated with the first control module and being disabled and stops communicating with the first control module when the electronic device is in a standby state. The first control module starts to detect whether the wake-up signal is generated when the when the second control module stops communication with the first control module, and controls the second control module to be enabled in response to the wake-up signal.

Abstract: An exemplary anti-pop circuit for use in an electronic device includes a switch module, a first path module, and a second control module. The first path module outputs a first response signal when the electronic device is being started, the switch module cuts off the connection between the audio IC and the speaker in response to the first response signal. The second control module includes a charge/discharge unit and a second path module. The charge/discharge unit is charged by the DC power supply when the electronic device is being started, and discharges to the second path module when the electronic device is being shut down. The second path module outputs a second response signal when the electronic device is being shut down, the switch module cuts off a connection between the audio IC and the speaker in response to the second response signal.

Abstract: A printed circuit board includes a substrate, at least one pad on the substrate, and permanent mold coatings capable of coating on the copper foil. Each pad includes a copper foil and a solder resist coating on the substrate and surrounding the copper foil. The copper foil defines an opening. The opening is coated with solder resist, whereby the permanent mold coatings form a recess corresponding to the opening when coated on the copper foil. A method for manufacturing a printed circuit board is also provided.

Abstract: An overvoltage protection circuit includes a connection jack, a path connection module, a voltage response module, and a control module. The connection jack is connected to a power supply. The path connection module is connected between the connection jack and a load. The voltage response module is to output a first signal in response to an overvoltage, and output a second signal in response to a constant voltage. The control module is to output a corresponding potential according to the first signal to turn off the path connection module, and output a corresponding potential according to the second signal to turn on the path connection module. When the path connection module is turned off, the connection between the connection jack and the load is disabled, when the path connection module is turned on, the connection between the connection jack and the load is enabled.

Abstract: A photoelectric switch control circuit includes a first resistance; a first capacitance; and a photoelectric switch having a plurality of contacts which comprise a first to a fourth contacts. The first contact is grounded, one end of the first resistance, the second and the third contacts of the photoelectric switch and one end of the first capacitance connects at node A, the fourth contact is connected with the processing unit and grounded via a second resistance, the other end of the first resistance is connected with a voltage source, the other end of the first capacitance is grounded.

Abstract: A power supply circuit for providing over-voltage protection includes a power supply unit and an output. The power supply unit includes a power input control terminal and a power output terminal. The power output terminal configured for connection to the output for supplying power to a load connected to the output. The power supply circuit includes an over-voltage response unit for connection to the output, and a control unit. The control unit is connected between the over-voltage response unit and the power input control terminal. The over-voltage response unit is configured for turning on the control unit. The control unit is configured for transmitting a control signal to the power supply unit to control the power supply unit to stop outputting power when it is turned on.

Abstract: An overvoltage protection circuit includes a connection jack, a path connection module, a voltage response module, and a control module. The connection jack is connected to a power supply. The path connection module is connected between the connection jack and a load. The voltage response module is to output a first signal in response to an overvoltage, and output a second signal in response to a constant voltage. The control module is to output a corresponding potential according to the first signal to turn off the path connection module, and output a corresponding potential according to the second signal to turn on the path connection module. When the path connection module is turned off, the connection between the connection jack and the load is disabled, when the path connection module is turned on, the connection between the connection jack and the load is enabled.

Abstract: A power source connecting device includes an adapter, a rail and a plurality of power cables. The adapter connected to an external power source converts the alternating current output from the external power source to direct current. The rail electrically connects to the adapter. One end of each of the power cable connected to an electronic device, and another end of each of the power cable connects to the rail and is configured for slide along the rail together with the electronic device. The power cable remains in electrical connection with the rail during the sliding.