Abstract: A server system includes a PCH, a BMC, a BIOS with a write protect end, and a controlling circuit. The BIOS includes a write protect end. The BMC includes a memory portion storing updated server data. The BIOS is electrically connected to the PCH and is electrically connected to the BMC. The controlling circuit includes a first input end and an output end. The first input end is electrically connected to the PCH. The output end is electrically connected to the write protect end. The controlling circuit is configured so that when an error in the BIOS is detected, the write protect end is opened and the BIOS is updated from the memory portion of the BMC.

Abstract: A server system includes a PCH, a BMC, a BIOS with a write protect end, and a controlling circuit. The BIOS includes a write protect end. The BMC includes a memory portion storing updated server data. The BIOS is electrically connected to the PCH and is electrically connected to the BMC. The controlling circuit includes a first input end and an output end. The first input end is electrically connected to the PCH. The output end is electrically connected to the write protect end. The controlling circuit is configured so that when an error in the BIOS is detected, the write protect end is opened and the BIOS is updated from the memory portion of the BMC.

Abstract: A disassembly tool for disengaging hooks of a number of memory slots from a number of memory cards includes a base plate, and two pivot arms. The pivot arms are pivotably connected to opposite ends of the base plate. An abutting portion is formed on an end of each pivot arm away from the base plate. When disengaging the hooks, the abutting portions abut the hooks and the base plate is manipulated down, the pivot arms are rotated to make the hooks rotate away from the memory cards.

Abstract: A wrench for disengaging hooks of a number of memory slots from a number of memory cards includes a main body, a handle extending from a first end of the main body, and an arced abutting portion formed on a second end of the main body opposite to the first end. When disengaging the hooks, the abutting portion are inserted between the hooks pivotably connected to same ends of the plurality of memory slots and the ends of the memory cards and pried, to make the hooks rotate away from the memory cards.

Abstract: A method for installing an operating system one or a great number of electronic devices includes steps of burning the operating system onto an NAND flash memory. The boot file of the operating system is captured from the NAND flash memory. The electronic device having been burnt the boot file of the operating system is connected to the USB flash stick storing the kernel file of the operating system. The electronic device is started up. The boot file of the operating system is run from the NAND flash memory of the electronic device, so accessing the kernel file of the operating system from the USB flash stick to make all system applications of the kernel files of the operating system have been executed.

Abstract: An exemplary load circuit includes a switch unit and a current dividing circuit. The switch unit includes a number of switches. The current dividing circuit includes a number of sub-circuits. A terminal of a resistance module of each of the sub-circuits is connected to both a power terminal and a terminal of a corresponding one of the switches. The other terminal of the resistance module of each of the sub-circuits is connected to a drain of a transistor of each of the sub-circuits. A source of the transistor is connected to ground. A gate of the transistor is connected to ground, and is also connected to another terminal of the corresponding switch.

Abstract: A circuit diagram includes a plurality of components. Each component corresponds to a module number and a component number. The components corresponding to a same module number are classified into a same function module. Each function module corresponds to a component module file. The component module file of each function module is generated according to the classified function modules. The component module file includes the module number of the function module and the component numbers of the components which are included in the function module. The component module files of the circuit diagram can be imported in a printed circuit board (PCB) drawing software.

Abstract: A computer-based method for marking signal transmission lines of a printed circuit board (PCB) layout includes: reading names of to-be-checked signal transmission lines in a name file; determining the to-be-checked signal transmission lines in a displayed PCB layout according to the read names; and marking the determined to-be-checked signal transmission lines in the displayed PCB layout. A related computing device is also provided.

Abstract: An exemplary power supply circuit for providing a driving voltage to a load includes a pulse width modulation (PWM) control circuit, a transformer, a voltage output terminal, and a temperature compensation circuit. The PWM control circuit is configured for outputting a pulse signal. The transformer is configured for converting a first direct current (DC) voltage to a second DC voltage according to the pulse signal. The voltage output terminal is configured for outputting the driving voltage based on the second DC voltage. The temperature compensation circuit includes a temperature sensor for detecting an operation temperature of the load and correspondingly generating a detecting signal, and a feedback signal transmitter for outputting a feedback signal based on the detecting signal. The PWM control circuit adjusts a duty ratio of the pulse signal according to the feedback signal outputted by the temperature compensation circuit.

Abstract: A control circuit for a motherboard with a power supply unit arranged thereon includes a processing unit. To save consumption of electrical energy, the processing unit controls a switch unit to discontinue regulating a first power to a second power in a condition where a state of the motherboard is changed from state S0 to state S5.

Abstract: An exemplary load circuit includes a switch unit and a current dividing circuit. The switch unit includes a number of switches. The current dividing circuit includes a number of sub-circuits. A terminal of a resistance module of each of the sub-circuits is connected to both a power terminal and a terminal of a corresponding one of the switches. The other terminal of the resistance module of each of the sub-circuits is connected to a drain of a transistor of each of the sub-circuits. A source of the transistor is connected to ground. A gate of the transistor is connected to ground, and is also connected to another terminal of the corresponding switch.

Abstract: A charger for reducing static power consumption includes a switch unit, a voltage conversion unit, a detection unit, and a control unit. The switch unit is configured for controlling an AC input voltage supply for the voltage conversion unit. The voltage conversion unit is configured for converting the AC input voltage to a DC voltage to a load. The detection unit is configured for detecting an output current to the load. The control unit is configured for controlling the switch unit on or off based on the output current.

Abstract: An exemplary power supply circuit for providing a driving voltage to a load includes a pulse width modulation (PWM) control circuit, a transformer, a voltage output terminal, and a temperature compensation circuit. The PWM control circuit is configured for outputting a pulse signal. The transformer is configured for converting a first direct current (DC) voltage to a second DC voltage according to the pulse signal. The voltage output terminal is configured for outputting the driving voltage based on the second DC voltage. The temperature compensation circuit includes a temperature sensor for detecting an operation temperature of the load and correspondingly generating a detecting signal, and a feedback signal transmitter for outputting a feedback signal based on the detecting signal. The PWM control circuit adjusts a duty ratio of the pulse signal according to the feedback signal outputted by the temperature compensation circuit.

Abstract: A power control circuit for a hard disk drive (HDD) includes a first control circuit, a second control circuit, a first connector connected to a power supply, the first and second control circuits, and a second connector connected to the first control circuit and the HDD. The power supply outputs a first voltage signal and a second voltage signal to the first and second control circuits via the first connector. The first control circuit converts the first and second voltage signals into a form compatible with a timing sequence of the HDD receiving voltage signals, and outputs the first and second voltage signals to the HDD via the second connector. The second control circuit controls the first control circuit.

Abstract: A power control circuit for a hard disk drive (HDD) includes a first control circuit, a second control circuit, a first connector connected to a power supply, the first and second control circuits, and a second connector connected to the first control circuit and the HDD. The power supply outputs a first voltage signal and a second voltage signal to the first and second control circuits via the first connector. The first control circuit converts the first and second voltage signals into a form compatible with a timing sequence of the HDD receiving voltage signals, and outputs the first and second voltage signals to the HDD via the second connector. The second control circuit controls the first control circuit.

Abstract: An electronic device includes a chassis used to accommodate a serial advanced technology attachment (SATA) extension board. The SATA extension board includes a main body and a fixing element mounted on the main body to engage with an extended port of the chassis. The main body includes a signal interface, a power interface, a SATA signal connector connected to the signal interface, and a SATA power connector connected to the power interface. The SATA signal connector and the SATA power connector passes through the fixing element to expose out of the chassis. The SATA extension board only needs to be installed into the chassis once, the electronic device without external SATA interface originally can be connected and disconnected to the SATA device from outside the chassis many times, without having to disassemble and assemble the chassis each time.

Abstract: An exemplary patch panel includes a printed circuit board having a plurality of signal terminals for connecting to two pairs of peripheral component interconnect express (PCI-E) X1 differential signal terminals of an I/O controller hub (ICH), an interface terminal of a high definition multimedia interface (HDMI), four pairs of differential signal terminals of the HDMI, four pairs of differential signal terminals of a graphic and memory controller hub (GMCH), one of another differential signal terminal of the GMCH, and two pairs of differential signal terminals of a PCI-E X16 slot. Therefore, the ICH is connected to the PCI-E X16 slot via the patch panel for supporting a PCI-E X1 card while the GMCH is connected to the HDMI via the patch panel. A patch panel connector is provided to mount the patch panel on a motherboard.

Abstract: An exemplary patch panel includes a printed circuit board having a plurality of signal terminals for connecting to two pairs of peripheral component interconnect express (PCI-E) X1 differential signal terminals of an I/O controller hub (ICH), an interface terminal of a high definition multimedia interface (HDMI), four pairs of differential signal terminals of the HDMI, four pairs of differential signal terminals of a graphic and memory controller hub (GMCH), one of another differential signal terminal of the GMCH, and two pairs of differential signal terminals of a PCI-E X16 slot. Therefore, the ICH is connected to the PCI-E X16 slot via the patch panel for supporting a PCI-E X1 card while the GMCH is connected to the HDMI via the patch panel. A patch panel connector is provided to mount the patch panel on a motherboard.