CD4017 network cable automatic tester ----- CD4017 Wire detector

Keywords: CD4017, network cable test circuit Author: Ding Deqin This kind of network automatic tester can easily detect the connection line sequence of the connection of the network line, with a certain practical value, the most suitable for beginners. The principle of circuit work is shown in the figure below. The NE555-type circuit is used to produce a symmetric square wave of a frequency of approximately f = 1 Hz. The IC2, IC3 of the decimal count / divider is output from 3 pin, and the output pulse signal is used, according to IC2: Q1 ~ Q8, IC3: The order of the q1 to q8 is turning the positive pulse, C2, R3 is IC2, IC3 provides a signal that is turned on, please pay attention to the sequence of the IC2, IC3, otherwise the indication signal of the output may have irregularities. . Walk according to the map is correct, and it can be used normally without debugging. How to use: The CT1, CT2 crystal male plug, insert the parent socket CZ1 and CZ2, then open the network automatic tester power supply, then open the network automatic tester power supply, then the first set of LED1 ~ LED8, the second set of LED1 ~ LED1 ~ LED8 is turned in sequentially, indicating that the network cable is embedded. If a light emitting diode is not bright, it indicates that the corresponding wire has a duel. About 8 ~ 10s can accurately complete the detection of the two 8-core network lines.

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