摘要:
An exemplary motor control circuit for controlling a motor includes a motor driving chip, a sensing unit, and a controller. The motor driving chip motor driving chip is electronically connected to the motor. The sensing unit includes a proximity sensor, the proximity sensor detects whether an external object is proximate to the proximity sensor. The controller is electronically connected to the motor driving chip and the sensing unit, the controller controls the motor driving chip to drive the motor to rotate in a first direction when an external object is detected, and controls the motor driving chip to drive the motor to rotate in a second direction reverse to the first direction when no external object is detected for a predetermined period of time.
摘要:
A power measuring system for measuring a turning-on power, a turning-off power, and a turned-on power of a first field-effect transistor includes a pulse driver, a first resistor, a processing unit, and an indication unit. The pulse driver generates square wave signals. The processing unit samples voltages at the source and the drain of the first field-effect transistor, and at the first and second terminals of the first resistor at the moment when the square wave signals changes from low to high or from high to low, and calculates the turning-on power, the turning-off power, and the turned-on power of the first field-effect transistor. The indication unit displays the turning-on power, the turning-off power, and the turned-on power of the first field-effect transistor.
摘要:
A motor control circuit for controlling rotation directions of a motor includes a primary power supply, a voltage monitor unit, a motor driving chip, a controller and a backup power supply. The backup power supply is constantly charged by the primary power supply when the primary power supply is in service. The voltage monitor unit is electronically connected to the primary power supply, and is configured for determining whether the primary power supply is in or out of service. The controller controls the motor driving chip to drive the motor to rotate in a first direction when the primary power supply is in service, and alternatively controlling the motor driving chip to drive the motor to rotate in a second direction reverse to the first direction when the primary power supply is out of service.
摘要:
A wireless unlocking system includes a programmable telephone. When the programmable telephone receives a call from a communication terminal along with a calling telephone number, the calling telephone number is matched with a number of pre-stored telephone numbers. The programmable telephone transmits an unlocking signal to an electrically controlled lock and unlocks a door if the telephone number of the call successfully matches one of the pre-stored telephone numbers.
摘要:
An electronic locking assembly includes an electronic lock and an electronic key for unlocking the electronic lock. The electronic key includes a first memory for storing a first password, and a first signal transceiver for encoding the first password into a first wireless signal and transmitting the first wireless signal. The electronic lock includes a main body for physically locking or unlocking the device, a second memory for storing a second password, a second signal transceiver, a processor, and a comparator. The second signal transceiver receives the first wireless signal and decodes the first wireless signal into the first password. The processor sends the first password and the second password to the comparator. The comparator compares whether the first password second password match, and thus to control the main body to physically lock or unlock the device.
摘要:
A test circuit includes two probes, a comparison circuit, a switch circuit, and an indication circuit. The probes are connected to an electronic component to be tested, and a low level signal is output if the electronic component is short-circuited. The comparison circuit outputs a comparison signal based on the shorting signal from the probes. The switch circuit outputs a switch signal based on the comparison signal from the comparison circuit. The indication circuit indicates that the electronic component is short-circuited or not short-circuited based on the switch signal fro m the switch circuit.
摘要:
A circuit for clearing complementary metal oxide semiconductor (CMOS) information of a CMOS chip includes a battery, first to fifth resistors, first and second electronic switches, a switching unit, and first and second diodes. The circuit can clear information of the CMOS chip when one or more switches are activated.
摘要:
A reception apparatus for flexible cable modules includes a plurality of holding units. Each of the holding units includes two holding bars and a holding board. The two holding bars are parallel to each other, and the two holding bars of each of the holding units are rotatably assembled with the two holding bars of a next one of the holding units to rotatably assemble all of the holding units one by one and form assemble apertures between adjacent ones of the holding board. The flexible cable modules repeatedly pass through selected ones of the assembling apertures to be held on the reception apparatus.
摘要:
A test device for testing a printed circuit board (PCB) includes a base and a measuring device. The measuring device includes a testing pin and is capable of measuring any desired point of the PCB on condition that the pin makes contact with the point at an included angle between the pin and a back surface of the PCB which is larger than a predetermined angle. The distance between the base and the PCB satisfies: H>L tan θ, where H is the vertical distance between the PCB and the base, L is the maximum length of an orthogonal projection of the pin on the PCB when the pin is contacting the point, and θ is the predetermined angle.
摘要翻译:用于测试印刷电路板(PCB)的测试装置包括基座和测量装置。 该测量装置包括测试销,并且能够测量PCB的任何所需点,条件是销以与销的大小成比大于预定角度的PCB与背面之间的夹角接触点。 基座和PCB之间的距离满足:H> L tan&Thetas;其中H是PCB和底座之间的垂直距离,L是当引脚接触时PCB上的销的正交投影的最大长度 点,和&thetas; 是预定角度。
摘要:
A fast-discharge circuit includes at least one power supply group, a switch circuit, and a power connector. Each power supply group includes a power supply unit, stabilizing capacitances, a diode, and a resistance. The power supply unit includes a positive output and a negative output. Anodes of the stabilizing capacitances and the diode are connected to the positive output of the power supply unit. Cathodes of the stabilizing capacitances are connected to the negative output. A cathode of the diode is also connected to the negative output through the resistance. The switch circuit includes a NMOS transistor. A drain of the NMOS transistor is electrically connected to the negative outputs of each power supply; a source of the NMOS transistor is grounded. The power connector includes a PS-ON pin electrically connected to a gate of the NMOS transistor.