I am trying to design a Multi-pins Cable Tester and in my research I found a circuit on the internet which I tried to reproduce on Multisim, as shown on the attached. The LEDs are supposed to lit only when the cable under test is good (continuity) and not lit when open. However, when I try to simulate the circuit on Multisim as shown, the LEDs doesn't lit. No error is given.
I don't know if anyone has any suggestion on what could be wrong with the Cable Tester circuit.
I would appreciate any hint and help.
Thanks.