Abstract: The disclosure provides a protection device including a temperature detection circuit, a switch circuit, a control circuit, and a warning circuit. The temperature detection circuit outputs temperature signal to the control circuit. The control circuit obtains the temperature signal from the temperature detection circuit, and compares the temperature signal with a preset temperature range and outputs a first control signal. The warning circuit sends warning based on the first control signal.

Abstract: In one example embodiment, a method performed under control of a wearable video playing device includes: transmitting identifying information for a location of the wearable video playing device to a video content provider; receiving, from the video content provider, video content information regarding a plurality of video contents recorded near the location; displaying, on a user interface, at least one video content identifier respectively corresponding to the video contents, wherein the at least one video content identifier is associated with the location; receiving an input to select one of the at least one video content identifier; and playing video content, from among the plurality of video contents recorded near the location, corresponding to the selected video content identifier.

Abstract: The disclosure provides a protection device including a temperature detection circuit, a switch circuit, a control circuit, and a warning circuit. The temperature detection circuit outputs temperature signal to the control circuit. The control circuit obtains the temperature signal from the temperature detection circuit, and compares the temperature signal with a preset temperature range and outputs a first control signal. The warning circuit sends warning based on the first control signal.

Abstract: A controlling circuit for a fan includes three comparators, a capacitor, and a thermistor. When the temperature around the thermistor changes, the resistance of the thermistor changes. The comparators control the charging and discharging time of the capacitor, thereby generating a corresponding pulse width modulation signal to the fan according to the temperature, to adjust the speed of the fan.

Abstract: In one example embodiment, a method performed under control of a wearable video playing device includes: transmitting identifying information for a location of the wearable video playing device to a video content provider; receiving, from the video content provider, video content information regarding a plurality of video contents recorded near the location; displaying, on a user interface, at least one video content identifier respectively corresponding to the video contents, wherein the at least one video content identifier is associated with the location; receiving an input to select one of the at least one video content identifier; and playing video content, from among the plurality of video contents recorded near the location, corresponding to the selected video content identifier.

Abstract: An all-in-one (AIO) computer with a fixed and simple connection includes a panel, a motherboard, and a connector. The connector includes a male connector and a female connector. The male connector is mounted on the motherboard and the female connector is mounted on the panel. The panel communicates with the motherboard through the connector.

Abstract: A digital multimeter includes a single chip processor, a sound chip connected to the single chip processor, a signal amplifying circuit, a speaker connected to the signal amplifying circuit, and a power source for providing electrical energy for the digital multimeter. The single chip processor collects high and low level signals, and converts the signals into codes which the sound chip can recognize, and transmits the codes to the sound chip. The sound chip converts the codes into audio signals and transmits the audio signals to the signal amplifying circuit. The signal amplifying circuit amplifies the audio signals and outputs the amplified audio signals to the speaker. The amplified audio signals reports the measurement values of the digital multimeter.

Abstract: An alternating current (AC) power cable includes discharge electrodes, a relay, and an electromagnetic coil with two windings. The relay includes an induction coil with two ends. The two ends of the induction coil are respectively connected to two ends of the electromagnetic coil. The discharge electrodes include a first discharge electrode and a second discharge electrode. The first discharge electrode is connected to the neutral wire of the AC power cable. The second discharge electrode is connected to the relay. When the AC power cable has residual charge, current is induced by the electromagnetic in the induction coil. The induction coil converts the current to magnetic force to close the relay. The residual charge is transmitted to the discharge electrodes through the relay.

Abstract: A protection circuit includes a coding chip, a digital-to-analog converter (DAC), and a control circuit. The coding chip receives parallel voltage identification definition (PVID) signals or serial voltage identification definition (SVID) signals from a central processing unit (CPU), and converts the PVID signals or the SVID signals to voltage identification definition (VID) signals. The DAC receives the VID signals from the coding chip, and converts the VID signals to an analog voltage. The control circuit receives the analog voltage from the DAC and a voltage received by the CPU, and compares the analog voltage from the DAC with the voltage received by the CPU. When the voltage received by the CPU is greater than the analog voltage from the DAC, the control circuit disconnects the CPU from a first power supply.

Abstract: A controlling circuit for a fan includes three comparators, a capacitor, and a thermistor. When the temperature around the thermistor changes, the resistance of the thermistor changes. The comparators control the charging and discharging time of the capacitor, thereby generating a corresponding pulse width modulation signal to the fan according to the temperature, to adjust the speed of the fan.

Abstract: A socket connector packaging includes a main body and a cover. The main body includes a first sidewall and a pivot positioned on the first sidewall. The cover includes a second sidewall, a coupling portion and a stop portion. The coupling portion and the stop portion are positioned on the second sidewall and opposite to each other. The pivot is placed over the coupling portion, thereby making the cover to be rotatable relative to the main body through the pivot. The stop portion is configured for preventing the cover from further rotating when the pivot contacts with the stop portion.

Abstract: An electrical connector assembly includes a male connector and a female connector connectable to the male connector. The male connector includes a male insulating housing and a number of first terminals assembled in the male insulating housing. a protrusion extends up from the top surface of the male insulating housing. The protrusion forms an ejecting surface at a rear side of the protrusion. The female connector includes a female insulating housing and a number of second terminals assembled to the female insulating housing for connecting with the first terminals. a fastening hole is defined in the top surface of the female insulating housing to hold the protrusion therein. The ejecting surface of the protrusion of the male connector is substantially arc-shaped or inclined.

Abstract: A driver device includes a circuit board, a number of sockets, a number of driver chips, a control switch, and a signal output element. The sockets are positioned on the circuit board. Each driver chip is received in and electrically connected to a corresponding socket. The control switch includes a number of switches. An input of each switch is electrically connected to a corresponding socket. An output of each switch is electrically connected to the computer motherboard through the signal output element.

Abstract: A socket connector includes a main body, a fastener for locking an electric element on the main body, and a cover. The fastener includes a fixed plate defining a through hole. The fixed plate includes two opposite inner sidewalls. A first slide rail protrudes inward from one inner sidewall, and a second slide rail protrudes inward from the other inner sidewall. The cover includes two blocks. Each of the blocks includes an L-shaped main portion and a stop portion connected to L-shaped main portion. The L-shaped main portion and the stop portion of each block cooperatively define a slide groove. The first rail and the second rail slide into the slide grooves, respectively, and are stopped by the corresponding stop portions, such that the cover is detachably positioned on the fixed plate.

Abstract: An electrical connector assembly includes a male connector and a female connector connectable to the male connector. The male connector includes a male insulating housing and a number of first terminals assembled in the male insulating housing. a protrusion extends up from the top surface of the male insulating housing. The protrusion forms an ejecting surface at a rear side of the protrusion. The female connector includes a female insulating housing and a number of second terminals assembled to the female insulating housing for connecting with the first terminals. a fastening hole is defined in the top surface of the female insulating housing to hold the protrusion therein. The ejecting surface of the protrusion of the male connector is substantially arc-shaped or inclined.

Abstract: A fan rotation speed test device connected to a computer includes an information processing chip, an indicating unit, and an interface. The interface is compatible with a memory socket on a mainboard of the computer. The computer transfers control instructions to the information processing chip via the interface. After receiving the control instructions, the information processing chip outputs PWM signals by executing programs therein to modulate the rotation speed of a fan. The information processing chip collects rotation speed signals of the fan, then judges if the rotation speed of the fan is according to a predetermined standard by executing arithmetic programs. The information processing chip outputs test result signals to the indicating unit for display.

Abstract: A monitor includes a microprocessor, a switch control unit, and a switch detecting unit receiving a system voltage and sending the system voltage to the microprocessor. When the microprocessor detects the presence of the system voltage, and the microprocessor outputs a first control signal to the switch control unit, to control the monitor to be turned on. When the microprocessor detects the system voltage not being present, and the microprocessor outputs a second control signal to the switch control unit, to control the monitor to be turned off.

Abstract: An electrical connector assembly includes a male connector and a female connector for connectable to the male connector. The male connector includes a male insulating housing and a number of first terminals assembled on the male insulating housing. An anti-mistake insertion bulge extends from the top surface of the male insulating housing. The female connector includes a female insulating housing and a number of second terminals assembled to the female insulating housing for connecting with the first terminals. An anti-mistake insertion gap is defined in the top surface of the female insulating housing. Two cutouts are defined in two opposite sidewalls bounding the anti-mistake insertion gap to hold the anti-mistake insertion bulge.

Abstract: A digital multimeter includes a single chip processor, a sound chip connected to the single chip processor, a signal amplifying circuit, a speaker connected to the signal amplifying circuit, and a power source for providing electrical energy for the digital multimeter. The single chip processor collects high and low level signals, and converts the signals into codes which the sound chip can recognize, and transmits the codes to the sound chip. The sound chip converts the codes into audio signals and transmits the audio signals to the signal amplifying circuit. The signal amplifying circuit amplifies the audio signals and outputs the amplified audio signals to the speaker. The amplified audio signals reports the measurement values of the digital multimeter.

Abstract: A socket connector includes a main body, a fastener for locking an electric element on the main body, and a cover. The fastener includes a fixed plate defining a through hole. The fixed plate includes two opposite inner sidewalls. A first slide rail protrudes inward from one inner sidewall, and a second slide rail protrudes inward from the other inner sidewall. The cover includes two blocks. Each of the blocks includes an L-shaped main portion and a stop portion connected to L-shaped main portion. The L-shaped main portion and the stop portion of each block cooperatively define a slide groove. The first rail and the second rail slide into the slide grooves, respectively, and are stopped by the corresponding stop portions, such that the cover is detachably positioned on the fixed plate.