Abstract: A charge circuit for charging a battery includes a converter and a timer. The converter converts alternating current (AC) of an AC power supply into direct current (DC) and outputs a DC voltage to the battery through a first resistor. The timer is used to set a period of time and stop charging the battery after the set period of time.

Abstract: A circuit includes a number of LEDs connected in series, and first and second electronic switches. An anode of a first one of the LEDs is connected to a first power supply. A control terminal of the first electronic switch receives a control signal. A first terminal of the first electronic switch is connected to a second power supply. A second terminal of the first electronic switch is grounded through a first resistor. A control terminal of the second electronic switch is connected to the second terminal of the first electronic switch. A first terminal of the second electronic switch is connected to a cathode of a last one of the LEDs. A second terminal of the second electronic switch is grounded through a second resistor.

Abstract: An exemplary server center includes a server, a heat dissipating system, and temperature controlling device. The heat dissipating system includes an exhaust fan, and an airflow tunnel connecting the exhaust fan with the server. The temperature controlling device includes a temperature sensor electrically connected to the server, and an airflow valve mounted on the airflow tunnel. The temperature sensor is configured for detecting a temperature of the server and controlling the airflow valve to permit the airflow enter the airflow tunnel or not, according to the temperature obtained from the server.

Abstract: A fan delay control circuit includes a fan connector connected to a fan of an electronic device, a power supplying module connected to the fan connector, and a rotational speed controlling module connected to the power supplying module. The power supplying module is connected to a fan power source and a stand-by power source. The power supplying module may continue to supply power to the fan when the electronic device including the fan is powered off. The rotational speed controlling module includes a square wave generation circuit which generates a square wave signal to control a rotational speed of the fan even when the electronic device is powered off.

Abstract: An enclosure includes a bottom plate, and a plurality of slide assemblies fixed to the bottom plate. Each of the plurality of slide assemblies includes a fixed member fixed to the bottom plate, and a rotary member rotatably received in the fixed member. The rotary member includes first and second fixed portions, and a wheel. The first fixed portion is fixed to the second fixed portion, the second fixed portion is connected to the fixed member, and the wheel is fixed to the first fixed portion. Each rotary member is operable to be in a first position to expose the respective wheel for moving the enclosure, and in a second position to be received in the respective fixed member.

Abstract: A server rack includes a main body, an electronic scale, and an alarm. The main body is used for receiving a number of servers. The electronic scale includes a pressure sensor and a microcontroller. The main body presses on the pressure sensor so that the pressure sensor can measure the pressure from the main body to obtain a pressure signal. The microcontroller analyzes the pressure signal to calculating the total weight of the main body and the servers. The alarm stores a predetermined weight threshold, which is the total weight of the main body and the maximum servers that the main body can bear. The alarm also compares the measured total weight with the predetermined weight threshold. When the measured total weight is larger than the predetermined weight threshold, the alarm alarms.

Abstract: A device includes an infrared sensor, a signal processing unit, a first signal conversion unit, a second signal conversion unit, and an interface. The infrared sensor senses infrared rays and outputs a signal to the signal processing unit. The signal processing unit processes the signal, and outputs a processed signal to the first signal conversion unit. The first signal conversion unit transforms the processed signal into a keyboard signal, and outputs the keyboard signal to the second signal conversion unit. The second signal conversion unit transforms the keyboard signal into an interface signal according to type of the interface, and outputs the interface signal to the interface. The interface outputs the interface signal to a computer connected to the interface, to cause the computer to exit a screen saver mode.

Abstract: An exemplary motherboard fixing device is for fixing a motherboard onto a case plate inside a computer case. The motherboard fixing device is fixable on the case plate, and includes a first fixing strip and a second fixing strip. The first fixing strip includes a first, second, and third flat plates. The second flat plate is between the first and third flat plates. The first and second flat plates cooperatively define a slide groove for receiving an edge of the motherboard. The second fixing strip includes a bottom plate and a lateral plate. The third flat plate and the bottom plate include first latch hooks. The first latch hooks is engagable in corresponding through holes of the case plate, such that the first and second fixing strips are fixed on the case plate. The lateral plate includes second latch hooks for being latchable on an opposite edge of the motherboard.

Abstract: A fan delay control circuit includes a fan connector connected to a fan of an electronic device, a power supplying module connected to the fan connector, and a rotational speed controlling module connected to the power supplying module. The power supplying module is connected to a fan power source and a stand-by power source. The power supplying module may continue to supply power to the fan when the electronic device including the fan is powered off. The rotational speed controlling module includes a square wave generation circuit which generates a square wave signal to control a rotational speed of the fan even when the electronic device is powered off.

Abstract: An exemplary motherboard fixing device is for fixing a motherboard onto a case plate inside a computer case. The motherboard fixing device is fixable on the case plate, and includes a first fixing strip and a second fixing strip. The first fixing strip includes a first, second, and third flat plates. The second flat plate is between the first and third flat plates. The first and second flat plates cooperatively define a slide groove for receiving an edge of the motherboard. The second fixing strip includes a bottom plate and a lateral plate. The third flat plate and the bottom plate include first latch hooks. The first latch hooks is engagable in corresponding through holes of the case plate, such that the first and second fixing strips are fixed on the case plate. The lateral plate includes second latch hooks for being latchable on an opposite edge of the motherboard.

Abstract: A Registered Jack-45 (RJ-45) connector assembly includes an RJ-45 connector, and an assisting apparatus for unplugging the RJ-45 connector. The RJ-45 connector includes a slanted resilient latch. The assisting apparatus includes a latching portion and a pressable portion. A receiving slot is defined in the front end of the latching portion, to engage with the resilient latch of the RJ-45 connector. When the pressable portion is pressed, the assisting apparatus drives the resilient latch of the RJ-45 connector to deform and disengage from a connector of an electronic device.

Abstract: A server rack includes a main body, an electronic scale, and an alarm. The main body is used for receiving a number of servers. The electronic scale includes a pressure sensor and a microcontroller. The main body presses on the pressure sensor so that the pressure sensor can measure the pressure from the main body to obtain a pressure signal. The microcontroller analyzes the pressure signal to calculating the total weight of the main body and the servers. The alarm stores a predetermined weight threshold, which is the total weight of the main body and the maximum servers that the main body can bear. The alarm also compares the measured total weight with the predetermined weight threshold. When the measured total weight is larger than the predetermined weight threshold, the alarm alarms.

Abstract: A fan delay controlling apparatus includes a connector connected to a fan of an electronic device, a power supplying module connected to the connector, and a power controlling module connected to the power supplying module. The power supplying module is connected to a fan power source and a stand-by power source. The power controlling module controls the power supplying module supply power to the fan when the electronic device including the fan powers off until an ambient temperature is lower than a predetermined value.

Abstract: An exemplary server center includes a server, a heat dissipating system, and temperature controlling device. The heat dissipating system includes an exhaust fan, and an airflow tunnel connecting the exhaust fan with the server. The temperature controlling device includes a temperature sensor electrically connected to the server, and an airflow valve mounted on the airflow tunnel The temperature sensor is configured for detecting a temperature of the server and controlling the airflow valve to permit the airflow enter the airflow tunnel or not, according to the temperature obtained from the server.

Abstract: A Registered Jack-45 (RJ-45) connector assembly includes an RJ-45 connector, and an assisting apparatus for unplugging the RJ-45 connector. The RJ-45 connector includes a slanted resilient latch. The assisting apparatus includes a latching portion and a pressable portion. A receiving slot is defined in the front end of the latching portion, to engage with the resilient latch of the RJ-45 connector. When the pressable portion is pressed, the assisting apparatus drives the resilient latch of the RJ-45 connector to deform and disengage from a connector of an electronic device.

Abstract: An enclosure includes a bottom plate, and a plurality of slide assemblies fixed to the bottom plate. Each of the plurality of slide assemblies includes a fixed member fixed to the bottom plate, and a rotary member rotatably received in the fixed member. The rotary member includes a first fixed and a second fixed portions, and a wheel. The first fixed portion is fixed to the second fixed portion, the second fixed portion is connected to the fixed member, and the wheel is fixed to the first fixed portion. The rotary member is operable to be in a first position to expose the wheels for moving the enclosure, and in a second position to be received in the fixed member.

Abstract: A circuit for indicating operating status of a plurality of hardware devices of a computer includes a detecting module, a decoding module, and an indicating module. The indicating module includes a dual color indicator and two electronic switches connected to a first input and a second input of the dual color indicator respectively. The detecting module detects an operating status of the plurality of hardware devices, and outputs state signals of each hardware device during power on self test of the computer. The decoding module decodes the state signals, and outputs level control signals to turn on or off the two electronic switches. The dual color indicator indicates operating status of the plurality of hardware devices by shifted to be at different indicating states by the two electronic switches correspondingly.

Abstract: An exemplary monitoring device includes: a time chip connected to a connector to generate a time signal and a count signal when the connector is working, the time signal indicating how long the connector is in use, the count signal indicating that the total number of times the connector has been used should be incremented by one; a processor connected to the time chip to receive the time signal and count signal, and generate a data signal including a total service time and a total number of times the connector has been used; a clock generator connected to the processor to provide a clock signal; and an output port connected to the processor to output the data signal. The monitoring device keeps a watch on a connector for showing the service information about the connector to make an operator know if the connector needs to be replaced.

Abstract: A fault analysis result generating system includes an extracting unit, a converting unit, a determining unit, and a result generating unit. The system extracts fault analysis files, converts the fault analysis files to a first predetermined file format which is easy to be processed, converts the fault analysis files with the first predetermined file format to a second predetermined file format, and then transfers the fault analysis files with the second predetermined file format to a learning sharing module.

Abstract: A fault analysis result generating system includes an extracting unit, a converting unit, a determining unit, and a result generating unit. The system extracts fault analysis files, converts the fault analysis files to a first predetermined file format which is easy to be processed, converts the fault analysis files with the first predetermined file format to a second predetermined file format, and then transfers the fault analysis files with the second predetermined file format to a learning sharing module.