- INVISIBLE OOVOO DETECTOR GENERATOR
- INVISIBLE OOVOO DETECTOR SERIAL
- INVISIBLE OOVOO DETECTOR PORTABLE
For single-wire testing, connecting neutral only to the live wire at one end is sufficient to detect the breakage point. However, if any of the remaining wires is also found to be faulty, then both ends of these wires are connected to neutral. Connect neutral terminal of the mains AC to the remaining wires at one end.
Then connect 230V AC mains live wire at one end of the faulty wire, leaving the other end free. Before detecting broken faulty wires, take out any connected load and find out the faulty wire first by continuity method using any multimeter or continuity tester. The whole circuit can be accommodated in a small PVC pipe and used as a handy broken-wire detector.
INVISIBLE OOVOO DETECTOR SERIAL
Using this gadget, one can also quickly detect fused small filament bulbs in serial loops powered by 230V AC mains. In such a case, the current consumption of the circuit will be around 7 mA.Īlternatively, one may use two 1.5V R6- or AA-type batteries. For audio-visual indication, one may use a small buzzer (usually built inside quartz alarm time pieces) in parallel with one small (3mm) LCD in place of LED1 and resistor R5. The circuit consumes 3 mA during the sensing of AC mains voltage. Invisible Broken Wire Detector Circuit DiagramĪG13 or LR44 type button cells, which are also used inside laser pointers or in LED-based continuity testers, can be used for the circuit. A 3V DC supply is sufficient for powering the whole circuit. (Due to the persistence of vision, the LED appears to be glowing continuously.) This type of blinking reduces consumption of the current from button cells used for power supply. Thus during every positive half-cycle of the mains frequency, the oscillator circuit is allowed to oscillate at around 1 kHz, making red LED (LED1) to blink. When the test probe is moved closer to 230V AC, 50Hz mains live wire, during every positive half-cycle, output pin 10 of gate N2 goes high. Simultaneously, the output of gate N3 at pin 6 goes ‘low’ to cut off transistor T1. As a result, diode D3 conducts and inhibits the oscillator circuit from oscillating. When the test probe is away from any high-voltage AC field, output pin 10 of gate N2 remains low. The voltage at output pin 10 of gate N2 can enable or inhibit the oscillator circuit.
Gates N1 and N2 are used to sense the presence of 230V AC field around the live wire and buffer weak AC voltage picked from the test probe. The frequency is determined by timing components comprising resistors R3 and R4, and capacitor C1.
INVISIBLE OOVOO DETECTOR GENERATOR
Gates N3 and N4 are used as a pulse generator that oscillates at around 1000 Hz in audio range. It is built using hex inverter CMOS CD4069. The circuit presented here can easily and quickly detect a broken/faulty wire and its breakage point in 1-core, 2-core, and 3-core cables without physically disturbing wires. In 3-core cables, it appears almost impossible to detect a broken wire and the point of break without physically disturbing all the three wires that are concealed in a PVC jacket. In such a case most people go for replacing the core/cable, as finding the exact location of a broken wire is difficult. Due to prolonged usage, the power cord wires are subjected to mechanical strain and stress, which can lead to internal snapping of wires at any point.
INVISIBLE OOVOO DETECTOR PORTABLE
Portable loads such as video cameras, halogen flood lights, electrical irons, hand drillers, grinders, and cutters are powered by connecting long 2- or 3-core cables to the mains plug.
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