Broken Wire Finder
Created: Feb 11, 2014
No description available.
Testing faulty wirings can be done by checking its continuity from the two end points. But this process will result to the entire line to be wasted since we would not know the exact point where the wire is cut. The purpose of this project is to find the exact point where the wire is damaged and repair it, this would lessen the cost compared to the process mentioned above.
To test the faulty wire with this device, the wire must be plugged into the AC power source. Then position the sensing probe of this device near to the wire, a LED will be turned ON indicating that it sensed an AC voltage. Run the probe starting from the power source following the wire until the LED turns OFF, this will indicate an absence of AC voltage, which means that a broken line is found.
This circuit is mainly operated by the IC HEF4069UBP hex inverter, two of its inverters are configured to act as a pulse generator that oscillates at around 100Hz. The frequency is determined by the timing components comprising two resistors and a capacitor. Another two inverters are used as a buffer to sense the presence of an AC voltage on the live wire picked from the sensing probe; the output of this buffer will enable or stop the oscillator circuit. The output of the oscillator circuit is then fed to the base of BC547 transistor switching the LED indicator ON/OFF.