Abstract: An electrical connector includes a plug and a socket coupled to the plug. The plug includes a base body and at least one first pin and a second pin. The at least one first pin and the second pin are attached to the base body. The socket defines at least one first hole and a second hole. A size of the first hole corresponds to the first pin and is configured to receive the first pin. A size of the second hole corresponds to that of the second pin and is configured to receive the second pin. A size of the second pin is greater than that of the first hole to prevent any wrong connections.

Abstract: An alarm system includes a wireless signal generating module configured to be mounted in an electronic device, a wireless signal receiving module, a processing module coupled to the wireless signal receiving module, a drive circuit coupled to the processing module, and an alarm device coupled to the drive circuit. The wireless signal generating module communicates with the wireless signal receiving module wirelessly when within a communication range of the wireless signal receiving module. The wireless signal generating module does not communicate with the wireless signal receiving module wirelessly when out of the communication range with the wireless signal receiving module, thereby the processing module sends a connection signal to the drive circuit. The drive circuit drives the alarm device to give an alarm when receiving the connection signal.

Abstract: A power supply detecting circuit for detecting a power supply status of a controlling system of a vending machine, includes a port equipped on the controlling system, a power supply unit, an alarming unit, and a switch unit. The port outputs a high level voltage signal when a normal power is supplied to the controlling system. The power supply unit provides power to the alarming unit. The switch unit is connected between the alarming unit and ground. The switch unit is controlled by the port. The switch unit is turned off to switch off the alarming unit when the high level voltage signal is outputted from the port. The switch unit is turned on to switch on the alarming unit when the normal power is not supplied to controlling system and the high level voltage signal is not outputted from the port.

Abstract: A fan speed testing system includes a voltage regulating module, a rotational frequency collecting module, and a rotational frequency converting module. The voltage regulating module receives an AC voltage signal and converts the AC voltage signal to a variable first DC voltage signal to adjust a rotational speed of a fan. The rotational frequency collecting module detects the rotational speed of the fan and outputs rotational frequency signals. The rotational frequency converting module receives the rotational frequency signals and determines the rotational speed of the fan according to numbers and period of time level voltage switching in the rotational frequency signals.

Abstract: A thermocouple welding test apparatus for testing whether a thermocouple is normally welded includes a first comparison circuit, a second comparison circuit, a switch circuit and an indication circuit. The first comparison circuit receives a first DC voltage from the thermocouple, and compares the first DC voltage with a first reference voltage to output a first control signal. The second comparison circuit receives a second DC voltage from the thermocouple, and compares the second DC voltage with a second reference voltage to output a second control signal. The switch circuit receives the first control signal and the second control signal, and outputs an indication signal accordingly. The indication circuit receives the indication signal, and indicates whether the thermocouple is normally welded accordingly.

Abstract: A solder apparatus includes a platform, an operating mechanism, a solder member, a heater, and a control box module. The control box module includes a temperature controller and a temperature sensor. The temperature controller defines a predetermined temperature. The temperature sensor is capable of measuring the temperature of the solder member. The temperature controller has the heater heat the solder member when the measured temperature of the solder member is lower than or equal to the predetermined temperature, and has the heater stop heating the solder member, when the measured temperature of the solder member is higher than the predetermined temperature.

Abstract: A solder apparatus includes a platform, an operating mechanism, a solder member, a heater, and a control box module. The control box module includes a temperature controller and a temperature sensor. The temperature controller defines a predetermined temperature. The temperature sensor is capable of measuring the temperature of the solder member. The temperature controller has the heater heat the solder member when the measured temperature of the solder member is lower than or equal to the predetermined temperature, and has the heater stop heating the solder member, when the measured temperature of the solder member is higher than the predetermined temperature.

Abstract: A fan speed testing system includes a voltage regulating module, a rotational frequency collecting module, and a rotational frequency converting module. The voltage regulating module receives an AC voltage signal and converts the AC voltage signal to a variable first DC voltage signal to adjust a rotational speed of a fan. The rotational frequency collecting module detects the rotational speed of the fan and outputs rotational frequency signals. The rotational frequency converting module receives the rotational frequency signals and determines the rotational speed of the fan according to numbers and period of time level voltage switching in the rotational frequency signals.

Abstract: An apparatus for testing a computer includes a control module having a power cycling test program and a display driving program therein, a switch module connected to the control module for receiving trigger signals generated from the power cycling test program and powering on or off the computer consequently, a driving module connected to the control module for receiving display driving signals from the display driving program, and a display module connected to the driving module for displaying test parameters. A method utilizing above described apparatus for testing the computer is also disclosed.

Abstract: An apparatus for testing a computer includes a control module having a power cycling test program and a display driving program therein, a switch module connected to the control module for receiving trigger signals generated from the power cycling test program and powering on or off the computer consequently, a driving module connected to the control module for receiving display driving signals from the display driving program, and a display module connected to the driving module for displaying test parameters. A method utilizing above described apparatus for testing the computer is also disclosed.

Abstract: A test device for testing startup performance of a computer comprises a setting circuit for recording triggering times for triggering startup of the computer and a time interval between two successive startups of the computer, a monolithic chip (10) comprising an input pin connected to the setting circuit, and an output pin for connection to the computer, the input pin being configured for receiving signals containing therein from the setting circuit, the output pin being configured for sending a computer startup signal, at the time interval, to the computer in response to the received signals; and a display device (20) electronically connected with the monolithic chip, the display device being configured for displaying at least one of the triggering times and the time interval.