Abstract: A discharge circuit includes a pulse width modulator (PWM) chip, a first and second electronic switch, and a resistor. The first electronic switch receives a voltage creep from the PWM chip. When the voltage creep is less than a voltage making the first electronic switch to turned on, the voltage creep is discharged through the resistor and the second electronic switch.

Abstract: A phase detection circuit includes first to third power input modules, first to third power input terminals, an alarm module, first to fifth electronic switches, and a power management module. The power input modules are used to convert pulse signals from a multi-phase power supply into direct current voltages and output the direct current voltages to the first to third electronic switches. When the multi-phase power supply operates abnormally, no direct current voltages are output to the first to third electronic switches and the alarm module alarms.

Abstract: In a method for automatically processing product change notice (PCN) of electronic products using a computing device, the computing device connects to a PCN database and a product design management (PDM) database through a network. PCN information of the electronic products are collected from suppliers and stored in the PCN database. A bill of materials (BOM) of each electronic product is created in the PDM database. PCN information of the electronic products is searched from the PCN database at a regular time interval. The BOM of a corresponding electronic product is searched from the PDM database according to a product ID obtained from the PCN information, and the product information of the electronic product is updated in the BOM. The PCN information of the electronic product is displayed on an electronic bulletin board to monitor the PCN information of the electronic product.

Abstract: A test circuit includes a first test circuit. The first test circuit includes a first light-emitting diode (LED) and a first resistor. An anode of the first LED is connected to a power supply. A cathode of the first LED is connected to a collector of a bipolar junction transistor (BJT) through the first resistor. An emitter of the BJT is grounded. A base of the BJT is connected to the power supply. A type of the BJT can be determined according to status of the first LED.

Abstract: A management device includes a control module, a display module, and an input module. The control module includes a control chip and a detecting unit. The detecting unit is used to receive first signals corresponding to a working status of hard disks and a backplane. The display module is coupled to the control chip to display parameters presenting the working status of the hard disks. The input module is used to input signals to control the display module to display more detailed parameters of the hard disks.

Abstract: An expansion board that can be inserted into a first memory slot is provided. The expansion board includes a circuit board, a number of second memory slots, a frequency divider, and an edge connector. The second memory slots and the frequency divider are arranged on the circuit board. The edge connector is set on a side of the circuit board to engage in the first memory slot. The second memory slots and the frequency divider are coupled to the edge connector, to communicate with the first memory slot via the edge connector.

Abstract: A voltage protection circuit includes a first power source, a power circuit, a comparator, and a electronic switch. The power circuit provides an output voltage to the comparator. The comparator compares the output voltage with a reference voltage. The electronic switch controls the power circuit according to the comparison. When the output voltage is larger than the reference voltage, the electronic switch controls the power circuit to stop providing the output voltage.

Abstract: A phase detection circuit includes first to third power input modules, first to third power input terminals, an alarm module, first to fifth electronic switches, and a power management module. The power input modules are used to convert pulse signals from a multi-phase power supply into direct current voltages and output the direct current voltages to the first to third electronic switches. When the multi-phase power supply operates abnormally, no direct current voltages are output to the first to third electronic switches and the alarm module alarms.

Abstract: A discharge circuit includes a pulse width modulator (PWM) chip, a first and second electronic switch, and a resistor. The first electronic switch receives a voltage creep from the PWM chip. When the voltage creep is less than a voltage making the first electronic switch to turned on, the voltage creep is discharged through the resistor and the second electronic switch.

Abstract: A test device for testing a printed circuit board (PCB) includes a base and a measuring device. The measuring device includes a testing pin and is capable of measuring any desired point of the PCB on condition that the pin makes contact with the point at an included angle between the pin and a back surface of the PCB which is larger than a predetermined angle. The distance between the base and the PCB satisfies: H>L tan ?, where H is the vertical distance between the PCB and the base, L is the maximum length of an orthogonal projection of the pin on the PCB when the pin is contacting the point, and ? is the predetermined angle.

Abstract: A mouse includes a casing, a light, a switch, and a supporting device. The casing includes a base plate and a top cover covering the base plate. The top cover defines a receiving hole. The switch is electrically connected to the light and used to turn the light on and off. The supporting device is movably accommodated in the receiving hole and supports the light. The supporting device is capable of moving out of the receiving hole.

Abstract: A fixing device includes a support fixed in a chassis, and a bracket installing a fan. The support includes a mounting plate. The mounting plate defines a vent area and a number of latching holes located around the vent area. The bracket includes a number of pins respectively latched into the latching holes of the support and a positioning portion. A tab protrudes from the support, to engage with the positioning portion of the bracket. An elastic portion extends down from the bracket to resiliently abut against the chassis.

Abstract: A method for testing stability of a server includes the following steps. Providing a first user input interface for a user to input test parameters. Generating a control signal according to the input test parameters and transmitting the control signal to the BMC of the server. Controlling the server to start and shut down via the BMC. Detecting whether the tested characteristics are within specified ranges during each start and shutting down operation. Generating a SEL if any abnormal result is obtained and records a test time when the abnormal result is obtained in the SEL. Storing the generated SEL in a storage unit. Providing a second user input interface on the display for the user to input conditions to filter test results. And responding to the input conditions and outputting corresponding test results to the display.

Abstract: A queue reminder method applied in a computing device computes a predicted waiting time interval of each uncalled number. The method generates a message when the predicted waiting time interval of an uncalled number is less than a preset time interval, and sends the message to a communication account associated with the uncalled number.

Abstract: A display device is coupled to a computer, and the computer accommodates a motherboard. The display device includes an interface unit connected to the motherboard, a display panel, and a processor electrically coupled to the interface unit. The processor is used to: receive a power-on self test (POST) code from the motherboard via the interface unit, convert the POST code into a debug code, and control the display panel to display the debug code.

Abstract: A voltage measurement apparatus includes a power interface, first and second voltage detecting modules, first and second driving modules, and first and second indication modules. The first voltage detecting module compares an output voltage with a first reference voltage, to determine whether the output voltage is greater than the first reference voltage. The second voltage detecting module compares the output voltage with a second reference voltage, to determine whether the output voltage is less than the second reference voltage. The first indication module indicates the output voltage when the output voltage is greater than the upper limit voltage or less than the lower limit voltage. The second indication module indicates the output voltage when the output voltage is less than or equal to the upper limit voltage and greater than or equal to the lower limit voltage.

Abstract: A Universal Serial Bus (USB) hub includes a USB input, a number of USB outputs, a USB controller, a power processing module, and an alarm. The USB controller controls data transmission between a connected USB device connected to the USB output and a computer. The power processing module obtains a power of each USB output and sums the power of all the USB outputs. The power processing module further compares a preset power value with the sum of the power. When the sum of the power is greater than the preset power value, the power processing module outputs a control signal to activate the alarm.

Abstract: An audio test cable includes three types of audio input and output (I/O) ports. The input port and the output port in each type of audio I/O ports form a short circuit for carrying a loopback test for a motherboard. The audio test cable also includes a test audio jack which connects to the output port of all types of audio I/O ports for carrying out an audio-quality test for the motherboard.

Abstract: An overvoltage protection circuit includes a power device for outputting a plurality of first powers, a plurality of VRMs for respectively receiving the plurality of first powers, a plurality of voltage dividing circuits, a reference power supply for outputting a reference voltage, and a comparison circuit having a comparator. Each VRM converts a corresponding first power to a regulated second power. The plurality of voltage dividing circuits respectively divides voltages of the second powers, each voltage dividing circuit outputs a divided voltage. The comparator compares a combination of the divided voltages with the reference voltage, and when an overvoltage occurs in at least one of the second powers, the comparator outputs a control signal via the output terminal to the power device to control the power device to shut down all of the first powers.