Posted on Oct 27, 2012

This compact tester checks cables for open-circuit or short-circuit conditions. A differential transistor pair at one end of each cable line remains balanced as long as the same clock pulse generated by timer IC appears at both ends of the line.

Click here to download the full size of the above Circuit.

A clock pulse, just at the clock end of the line, lights a green LED, and a clock pulse, only at the other end, lights a red LED.

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