The little device circuit of looking for cable break

Published:2011/6/1 21:47:00 Author:Seven | Keyword: device, cable break | From:SeekIC

4060 and other parts consist a oscillator of 20KHZ, while the resistance capacitor of 100k and 200PF can change this frequency. Either Q3,Q4 and Q5 of IC can drive the LED or the electric buzzer, so that they can provide with necessary notices. This circuit is fixed in a metal case. When testing, we should hold the cable with one hand, and hold the tester with the other hand, besides, we should touch each pin with the probe in sequence, if the pin is linked, the separated capacitor will reduce the audio frequency. After that, we will do the same test to the other terminal.



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