Cable Tester Circuit

  
At the heart of the cable tester are two op amps, which are used as a window- comparator to indicate a short- or open-circuit condition. A third op-amp comparator is used to indicate a good circuit (i.e., neither open nor shorted). Colored LEDs are used to show the condition of individual conductors within the cable under test; a red one to indicate a short between conductors, a yellow one to identify an open conductor, and a green one to signify that the conductor is okay.
Cable Tester Circuit - schematic

Individual LEDs of a bar-graph display are used to show which conductor in the cable is being tested.




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