Abstract:
A socket connector packaging includes a main body and a cover. The main body includes a first sidewall and a pivot positioned on the first sidewall. The cover includes a second sidewall, a coupling portion and a stop portion. The coupling portion and the stop portion are positioned on the second sidewall and opposite to each other. The pivot is placed over the coupling portion, thereby making the cover to be rotatable relative to the main body through the pivot. The stop portion is configured for preventing the cover from further rotating when the pivot contacts with the stop portion.
Abstract:
An auto-shut off circuit includes a relay, a voltage conversion device, a first diode, a second diode, a third diode, a capacitor, a first transistor, and a second transistor. The relay includes a coil and a switch. The auto-shut off circuit disconnects an electronic device from a power supply when the electronic device is not at a working state.
Abstract:
A fan control circuit includes an integrated circuit (IC), a thermistor, and a transistor. A first input of the IC is connected to a fan power supply. A second input of the IC is connected to a stand-by power supply. A base of the transistor is grounded through the thermistor. An emitter of the transistor is connected to an output of the IC. A collector of the transistor is connected to a fan.
Abstract:
A system and method validates design of an electronic product using a computing device. The method establishes design failure data and product failure data of the electronic product in a database. When the design of the electronic product is finished, the method determines whether the design is eligible by examining design modules of the design according to the design failure data in the database. When the design is eligible, the method determines whether the validation of actual samples of the electronic device is successful by validating actual samples of the electronic product according to the product failure data in the database. If the validation of the actual samples is successful, the method acquires abnormal data of executing the actual samples, and updates failure data converted from the abnormal data into the database, if the abnormal data has been acquired.
Abstract:
A protection circuit includes a coding chip, a digital-to-analog converter (DAC), and a control circuit. The coding chip receives parallel voltage identification definition (PVID) signals or serial voltage identification definition (SVID) signals from a central processing unit (CPU), and converts the PVID signals or the SVID signals to voltage identification definition (VID) signals. The DAC receives the VID signals from the coding chip, and converts the VID signals to an analog voltage. The control circuit receives the analog voltage from the DAC and a voltage received by the CPU, and compares the analog voltage from the DAC with the voltage received by the CPU. When the voltage received by the CPU is greater than the analog voltage from the DAC, the control circuit disconnects the CPU from a first power supply.
Abstract:
A voltage testing circuit includes a voltage input terminal, an LED, a first reference resistor, a transistor, a current-limiting resistor, a second reference resistor, and a 3-terminal adjustable regulator. The transistor includes an emitter, a base connected to the voltage input terminal through the first reference resistor, and a collector connected to the voltage input terminal. The current-limiting resistor is connected between the emitter and an anode of the LED. The second reference resistor is connected between the voltage input terminal and ground. The 3-terminal adjustable regulator includes a positive terminal grounded, a negative terminal connected to a cathode of the LED, and a controlling terminal connected to the voltage input terminal through the second reference resistor. The LED emits light according to voltage of the voltage input terminal.
Abstract:
A fan speed control circuit for controlling the rotation speed of a fan motor unit. The speed control circuit includes a resistor, a voltage stabilizing unit, a transistor and a thermal resistor. The resistor is connected to a power source of the fan motor unit, the voltage stabilizing unit is connected between the resistor and ground. The collector of the transistor is connected to the fan motor unit, the base is connected to a node between the resistor and the voltage stabilizing unit. The thermal resistor is connected between an emitter of the transistor and ground.
Abstract:
A driver device includes a circuit board, a number of sockets, a number of driver chips, a control switch, and a signal output element. The sockets are positioned on the circuit board. Each driver chip is received in and electrically connected to a corresponding socket. The control switch includes a number of switches. An input of each switch is electrically connected to a corresponding socket. An output of each switch is electrically connected to the computer motherboard through the signal output element.
Abstract:
A linear voltage stabilizing circuit includes a main stabilizing unit, a first resistor, a second resistor, and a sub-stabilizing unit. The main stabilizing unit includes a first transistor connected between a signal input terminal and a signal output terminal, and a first comparator controlling the first transistor. The first and the second resistor are connected between the signal input terminal and ground. The voltage between the first resistor and the second resistor is equal to a first reference voltage. The sub-stabilizing unit includes a third resistor, a fourth resistor, a second transistor connected between the signal input terminal and the first transistor, and a second comparator. The third and fourth resistor are connected between the second comparator and ground. The node of the third and fourth resistor is connected to the node between the first and the second resistor. The second comparator controls the second transistor turn on or off.
Abstract:
An electronic device includes a power unit, an alarm, a silicon-controlled rectifier (SCR), a thermo-sensor, a variable resistor, and a zener diode. The variable resistor is connected to the thermo-sensor in series between the power unit and ground. A first input terminal of the comparator is connected to a node between the thermistor and the variable resistor. A second input terminal of the comparator is connected to a node between the zener diode and the first resistor to receive a reference voltage. An output terminal of the comparator is connected to a control terminal of the SCR. When a temperature of the electronic device is higher than a predetermined temperature, the comparator turns on the SCR to activate the alarm. When the temperature of the electronic device is lower than the predetermined temperature, the comparator turns off the SCR and the alarm turns off.