Abstract: A casing includes a base, a trigger switch, an alarm device, and a cover. The base includes a first side plate and a second side plate perpendicular to the first side plate. The trigger switch is mounted to an inner side of the first side plate. A resilient tab is formed on a top of the trigger switch. The alarm device is electrically connected to the trigger switch. The cover covers on a top of the base and deforms the resilient tab down. A recess is defined in a bottom surface of the cover and located between the second side plate and the resilient tab. When the cover is slid away from the second side plate, the recess aligns with the resilient tab. The resilient tab enters the recess and restores. The trigger switch triggers the alarm device to alarm.

Abstract: A casing includes a base, a trigger switch, an alarm device, and a cover. The base includes a first side plate and a second side plate perpendicular to the first side plate. The trigger switch is mounted to an inner side of the first side plate. A resilient tab is formed on a top of the trigger switch. The alarm device is electrically connected to the trigger switch. The cover covers on a top of the base and deforms the resilient tab down. A recess is defined in a bottom surface of the cover and located between the second side plate and the resilient tab. When the cover is slid away from the second side plate, the recess aligns with the resilient tab. The resilient tab enters the recess and restores. The trigger switch triggers the alarm device to alarm.

Abstract: A motherboard includes a resistor, a display card controller, first and second display connectors, and a signal switch chip. A display device is connected to either the first or second display connector. A detecting pin of the first display connector is connected to a power source through the resistor. The signal switch chip is connected between the display card controller and each of the first display connector and the second display connector.

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: A voltage regulating circuit converts a first voltage and provides the converted first voltage to a first voltage pin of a north bridge chip after receiving a control signal from a south bridge chip. A second voltage pin of the north bridge chip is connected to a voltage converting circuit for receiving a second voltage. The logic control circuit receives a control signal from the super I/O chip and outputs a first control signal to turn on the switch to connect the first and the second voltage pins together. The logic control circuit also outputs a second control signal to the voltage regulating circuit to control the voltage regulating circuit to stop providing the converted first voltage to the first voltage pin of the north bridge chip. The voltage converting circuit provides the second voltage to the first voltage pin of the north bridge chip via the switch.

Abstract: A soldering assistance device is used for soldering a multi-pin electronic element with a row of pins on a PCB. The row of pins includes an outer pin at two ends thereof. The soldering assistance device includes a holding portion and a soldering portion connected to the holding portion. The soldering portion is adjacent to the outer pin. An interval between the soldering portion and the outer pin is less than an interval between each two adjacent pins of the row of pins. The soldering portion is made of a metal which is easy to solder. A soldering method using the soldering assistance device is also provided.

Abstract: A time sequence control circuit is provided to control time sequence of a motherboard of a computer. A first voltage received by a power supply receiving terminal is greater than a preset voltage before a signal control terminal on the motherboard receives a second voltage during turning on the computer. During shutting off the computer, the first voltage at the power supply receiving terminal drops and is less than the preset voltage, and the second voltage supplied to the signal control terminal on the motherboard is shut off.

Abstract: A time sequence control circuit that can control time sequence of a computer. After the computer is turned on, a power supply terminal outputs a high level enabling signal to an enabling pin of a power supply circuit, the power supply circuit is active. A power supply pin of the power supply circuit outputs a standard voltage to a power pin of each of the motherboard components. A first electronic switch is turned on, a second electronic switch is turned off, and a power supply state pin of the power supply circuit outputs a high level power supply state signal to a power state input pin of a main chip after the power supply circuit outputs the standard voltage.

Abstract: A system can control a rotary speed of a computer fan according to the type of the computer fan. If the computer fan is determined to be a 3-pin fan, the system can output a changeable voltage to control the rotary speed of the 3-pin fan.

Abstract: A voltage regulating circuit converts a first voltage and provides the converted first voltage to a first voltage pin of a north bridge chip after receiving a control signal from a south bridge chip. A second voltage pin of the north bridge chip is connected to a voltage converting circuit for receiving a second voltage. The logic control circuit receives a control signal from the super I/O chip and outputs a first control signal to turn on the switch to connect the first and the second voltage pins together. The logic control circuit also outputs a second control signal to the voltage regulating circuit to control the voltage regulating circuit to stop providing the converted first voltage to the first voltage pin of the north bridge chip. The voltage converting circuit provides the second voltage to the first voltage pin of the north bridge chip via the switch.

Abstract: A time sequence control circuit that can control time sequence of a computer. After the computer is turned on, a power supply terminal outputs a high level enabling signal to an enabling pin of a power supply circuit, the power supply circuit is active. A power supply pin of the power supply circuit outputs a standard voltage to a power pin of each of the motherboard components. A first electronic switch is turned on, a second electronic switch is turned off, and a power supply state pin of the power supply circuit outputs a high level power supply state signal to a power state input pin of a main chip after the power supply circuit outputs the standard voltage.

Abstract: When the fan inserted in the fan header is a 4-pin fan, the control chip outputs PWM signals with different duty factors to the control pin of the fan header, to automatically change the rotary speed of the 4-pin fan. When the fan inserted in the fan header is a 3-pin fan, the control chip outputs the PWM signals whose duty factor changes with temperature of a chip under the fan to control the first power source to provide a voltage to the adjusting circuit. The adjusting circuit rectifies the voltage output from the first power source as an analog voltage signal to the control circuit. The control circuit controls the third power source to output a changeable driving voltage to the power pin of the fan header to control the rotary speed of the 3-pin fan.

Abstract: A time sequence control circuit is provided to control time sequence of a motherboard of a computer. A first voltage received by a power supply receiving terminal is greater than a preset voltage before a signal control terminal on the motherboard receives a second voltage during turning on the computer. During shutting off the computer, the first voltage at the power supply receiving terminal drops and is less than the preset voltage, and the second voltage supplied to the signal control terminal on the motherboard is shut off.

Abstract: When the fan inserted in the fan header is a 4-pin fan, the control chip outputs PWM signals with different duty factors to the control pin of the fan header, to automatically change the rotary speed of the 4-pin fan. When the fan inserted in the fan header is a 3-pin fan, the control chip outputs the PWM signals whose duty factor changes with temperature of a chip under the fan to control the first power source to provide a voltage to the adjusting circuit. The adjusting circuit rectifies the voltage output from the first power source as an analog voltage signal to the control circuit. The control circuit controls the third power source to output a changeable driving voltage to the power pin of the fan header to control the rotary speed of the 3-pin fan.

Abstract: A system can control a rotary speed of a computer fan according to the type of the computer fan. If the computer fan is determined to be a 3-pin fan, the system can output a changeable voltage to control the rotary speed of the 3-pin fan.

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.