Abstract: A power-off control circuit applied in an electronic device includes a switch, a first control unit, a first buffer unit, a second control unit, and a second buffer unit. A first control unit coupled to the second terminal of the switch. The first control unit receives a first logic signal when the switch is pressed, and outputs a first control signal. A first buffer unit is coupled to an output of the first control unit to receive the first control signal, and outputs a second control signal. A second buffer unit is coupled to the second terminal of the switch to receive the first logic signal, and outputs a third control signal. A second control unit is coupled to an output of the second buffer unit to receive the third control signal, and outputs a power-off control signal to make the electronic device to power-off.

Abstract: An electronic device includes a number of hard disk devices, a detection system, and a power supply. The detection system includes a detection device, a controller, and an emergency power supply. The power supply is coupled to the hard disk devices and the detection system, to power the hard disk devices and the detection system. The emergency power supply is coupled to the controller and the display device, to power the controller and the display device. The controller is coupled to the detection device and the display device. The detection device detects data of the hard disk devices and transmits the data to the controller. The controller receives the data from the detection device, and transmits the data to the display device. The display device displays the data.

Abstract: A power-off control circuit applied in an electronic device includes a switch, a first control unit, a first buffer unit, a second control unit, and a second buffer unit. A first control unit coupled to the second terminal of the switch. The first control unit receives a first logic signal when the switch is pressed, and outputs a first control signal. A first buffer unit is coupled to an output of the first control unit to receive the first control signal, and outputs a second control signal. A second buffer unit is coupled to the second terminal of the switch to receive the first logic signal, and outputs a third control signal. A second control unit is coupled to an output of the second buffer unit to receive the third control signal, and outputs a power-off control signal to make the electronic device to power-off.

Abstract: A control circuit includes a control module, a trigger module and an unlock module. The control circuit is coupled to a power supply. The trigger module outputs different signals to the control module to activate or inactivate the power supply. The control circuit locks the status of the control circuit in a preset time since the power supply is activated. Thus, no matter what signal the trigger module outputs to the control module, the control module continues activating the power supply. The unlock module is used to output an unlock signal to the control module to unlock the status of the control circuit.

Abstract: An electronic system includes an electronic component, a heat dissipation device coupled on the electronic component and a retaining device around the electronic component. The heat dissipation device includes a base configured to contact the electronic component and a plurality of fins extending from the base. The base includes a coupling face forming a plurality of screw threads thereon. The retaining device includes at least a coupling face. The coupling face of the retaining device forms a plurality of screw threads for engaging with the screw threads of the coupling face of the base.

Abstract: An indicating circuit includes a first control module, a second control module, a third control module and an alarm module. When the electronic device is operating and the temperature of the electronic device exceeds a preset value, the first control module outputs a second control signal to the third control module, the second control module outputs the second control signal to the third control module, the third control module outputs the second control signal to the alarm module, and the alarm module indicates the temperature of the electronic device exceeds the preset value.

Abstract: A switch circuit for a just a bunch of disks (JBOD) includes a selection module, a trigger module, a delay module, and a control module. The selection module is configured to receive a button signal. The trigger module is coupled to the selection module to receive a selection signal and output a power on trigger signal or a power off trigger signal. The delay module is configured to receive the button signal and output a delay signal after a preset time. The control module is coupled between the delay module and the selection module to receive the delay signal and then output a control signal to the selection module. The disclosure further provides a JBOD.

Abstract: A complementary metal oxide semiconductor (CMOS) data reset circuit includes a control unit, a south bridge chip including a reset pin electrically coupled to the control unit, and a indicating unit electrically coupled between the control unit and the south bridge chip. The control unit outputs a control signal to the reset pin and the indicating unit to cause resetting of the CMOS data by the south bridge chip and the indicating unit indicates the resetting of CMOS data as it takes place.

Abstract: A control circuit for a fan of an electronic system includes a temperature sensor detecting temperature in the electronic system, a connector electrically coupled to the fan, and a control chip electrically coupled to the temperature sensor and the connector to obtain instant temperature and rotational speed. Through the connector, the control chip outputs a first pulse width modulation (PWM) signal configured to adjust duty ratio of the first PWM signal. An amplitude adjustment unit electrically coupled to the control chip is configured to adjust amplitude of the first PWM signal to output a second PWM signal, and an inverting unit electrically coupled to the connector and the amplitude adjustment unit reverses the second PWM signal to output a third PWM signal to the fan, through the connector, to control the rotational speed of the fan.

Abstract: A signal switching circuit for a system of Just a Bunch of Disks includes a first connector, a second connector, and first gate module. The first connector is coupled to a server and the second connector is coupled to an external device. The server communicates with the Bunch of Disks (BOD) through the first connector and the external device communicates with the BOD through the second connector. When the external device is coupled to the second connector, a control signal is outputted from the second connector. The first gate module receives the control signal and outputs data signals outputted from the first connector or from the second connector according to the control signal. A system of Just a Bunch of Disks is also included.

Abstract: A signal processing circuit is connected between a first external circuit and a second external circuit. The signal processing circuit includes a signal input module and a signal processing module. The signal input module receives signal from the first external circuit. The processing module processes the signals received from the signal input module.

Abstract: An electronic device includes a number of hard disk devices, a detection system, and a power supply. The detection system includes a detection device, a controller, and an emergency power supply. The power supply is coupled to the hard disk devices and the detection system, to power the hard disk devices and the detection system. The emergency power supply is coupled to the controller and the display device, to power the controller and the display device. The controller is coupled to the detection device and the display device. The detection device detects data of the hard disk devices and transmits the data to the controller. The controller receives the data from the detection device, and transmits the data to the display device. The display device displays the data.

Abstract: An interface test device includes several interfaces, a test signal input interface, a control signal input interface, and a control module. The interface test device is connected between an electronic device and a computer. The interface test device receives control signals from the computer through the control signal input interface. The interface test device selectively outputs test signals to the electronic device through test interfaces corresponding to the control signals.

Abstract: A power supply unit includes a shell, a handle, and a latching assembly. The shell includes an end wall defining a receiving slot and a sidewall perpendicularly extending forward from a side of the end wall. The handle includes a rotating member rotatably installed in the receiving slot. The rotating member includes an operation portion. The latching assembly includes a resilient latching member received in the shell and a sliding member. A front end of the latching member is mounted to the sidewall. The sliding is slidably connected to a rear end of the latching member. The sliding member is capable being received in the latching member. The sidewall defines a through hole. A piece protrudes out from the latching member to extend through the through hole. The rotating member is rotatable such that the operation portion is received in the shell.

Abstract: A power supply unit includes a shell, a handle, and a latching assembly. The shell includes an end wall defining a receiving slot and a sidewall perpendicularly extending forward from a side of the end wall. The handle includes a rotating member rotatably installed in the receiving slot. The rotating member includes an operation portion. The latching assembly includes a resilient latching member received in the shell and a sliding member. A front end of the latching member is mounted to the sidewall. The sliding is slidably connected to a rear end of the latching member. The sliding member is capable being received in the latching member. The sidewall defines a through hole. A piece protrudes out from the latching member to extend through the through hole. The rotating member is rotatable such that the operation portion is received in the shell.

Abstract: A server cabinet includes a bottom wall, a plurality of supporting poles extending up from the bottom wall, and a plurality of adjusting assemblies installed on distal ends of the supporting poles. Each adjusting assembly includes a sliding member slidably fitted about the corresponding supporting pole along a lengthwise direction of the supporting pole, and a number of fasteners mounting the sliding member to the supporting pole.