Abstract: A testing device includes a positioning mechanism, a testing mechanism, and a controller. The testing device is used for testing lengths, widths, straightness, verticality, flatness, position of the testing points, and other dimensions of a workpiece. The positioning mechanism is used for positioning the workpiece. The testing mechanism is fixed on the positioning mechanism for testing dimensions of the workpiece at one time. The controller is electrically coupled to the testing mechanism for controlling the testing mechanism in use.

Abstract: A testing device includes a positioning mechanism, a testing mechanism, and a controller. The testing device is used for testing lengths, widths, straightness, verticality, flatness, position of the testing points, and other dimensions of a workpiece. The positioning mechanism is used for positioning the workpiece. The testing mechanism is fixed on the positioning mechanism for testing dimensions of the workpiece at one time. The controller is electrically coupled to the testing mechanism for controlling the testing mechanism in use.

Abstract: A testing device for a USB I/O board includes USB plugs connected to the USB I/O board, a connector connected to the USB I/O board, an indication module, and a testing module including data output terminals connected to the USB plugs, data reception terminals connected to the connector, and indication terminals connected to the indication module. The testing module sends a testing signal to the USB I/O board via the data output terminals, and receives the testing signal from the USB I/O board via the data reception terminals. The testing module compares the testing signal to a threshold signal stored in the testing module. If the testing signal and the threshold signal are not substantially the same, the testing module generates an alarm signal to drive the indication module via the indication terminal. The indication module indicates the USB I/O board is abnormal.

Abstract: A universal serial bus (USB) component tester for testing a USB component that has a plug and a USB port includes a connector, a USB port, and a first indicator. The connector includes a first power pin, a first data pin connected to the first power pin, a second data pin, and a first ground pin connected to the second data pin and also connected to the first data pin via a first resistor. The USB port includes a power terminal connected to a power supply, a first data terminal, a second data terminal, and a grounded ground terminal, and the first data terminal is connected to the second data terminal via a second resistor. The first indicator includes a first terminal connected to the first data terminal via the second resistor, and a second terminal connected to the second data terminal.

Abstract: A testing apparatus includes a relay and a connector. The relay includes a coil, first and second single-pole double-throw (SPDT) switches. The first and the second SPDT switches include first and second contacts. The connector includes first and second hard disk drive (HDD) indicator pins, and first and second switch pins. The first contact of the first SPDT switch is grounded. The first contact of the second SPDT switch is connected to the power source. The first HDD indicator pin is connected to a power source. The second HDD indicator pin is connected to the second contact of the first SPDT switch and the second contact of the second SPDT switch. The first switch pin is connected to the power source. The second switch pin is grounded via the coil.

Abstract: A sound channel detection circuit includes a amplifier circuit and a LED. The amplifier circuit has an input connected to a connector for receiving an AC voltage signal and an output. The LED has an anode connected to the output of the amplifier circuit and a cathode connected to ground, when a sound channel circuit to be tested works normally, the AC voltage is amplified by the amplifier circuit and drives the LED to flash, when the sound channel circuit to be tested is not working, the LED doesn't emit light. The sound channel detection circuit with the amplifier circuit and the LED can improve the accuracy and efficiency of detection in a situation of a batch production in a noisy environment.

Abstract: A universal serial bus (USB) component tester for testing a USB component that has a plug and a USB port includes a connector, a USB port, and a first indicator. The connector includes a first power pin, a first data pin connected to the first power pin, a second data pin, and a first ground pin connected to the second data pin and also connected to the first data pin via a first resistor. The USB port includes a power terminal connected to a power supply, a first data terminal, a second data terminal, and a grounded ground terminal, and the first data terminal is connected to the second data terminal via a second resistor. The first indicator includes a first terminal connected to the first data terminal via the second resistor, and a second terminal connected to the second data terminal.

Abstract: A testing apparatus includes a relay and a connector. The relay includes a coil, first and second single-pole double-throw (SPDT) switches. The first and the second SPDT switches include first and second contacts. The connector includes first and second hard disk drive (HDD) indicator pins, and first and second switch pins. The first contact of the first SPDT switch is grounded. The first contact of the second SPDT switch is connected to the power source. The first HDD indicator pin is connected to a power source. The second HDD indicator pin is connected to the second contact of the first SPDT switch and the second contact of the second SPDT switch. The first switch pin is connected to the power source. The second switch pin is grounded via the coil.

Abstract: A testing device for a USB I/O board includes USB plugs connected to the USB I/O board, a connector connected to the USB I/O board, an indication module, and a testing module including data output terminals connected to the USB plugs, data reception terminals connected to the connector, and indication terminals connected to the indication module. The testing module sends a testing signal to the USB I/O board via the data output terminals, and receives the testing signal from the USB I/O board via the data reception terminals. The testing module compares the testing signal to a threshold signal stored in the testing module. If the testing signal and the threshold signal are not substantially the same, the testing module generates an alarm signal to drive the indication module via the indication terminal. The indication module indicates the USB I/O board is abnormal.

Abstract: A sound channel detection circuit includes a amplifier circuit and a LED. The amplifier circuit has an input connected to a connector for receiving an AC voltage signal and an output. The LED has an anode connected to the output of the amplifier circuit and a cathode connected to ground, when a sound channel circuit to be tested works normally, the AC voltage is amplified by the amplifier circuit and drives the LED to flash, when the sound channel circuit to be tested is not working, the LED doesn't emit light. The sound channel detection circuit with the amplifier circuit and the LED can improve the accuracy and efficiency of detection in a situation of a batch production in a noisy environment.