This project is an Earth Fault Indicator.
Here is a simple tester to find whether the mains wiring is Correct or not. This tester can be used to check sockets periodically before connecting appliances like heater and electric iron. It indicates the status of the mains wiring through two LEDs as shown in image.
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Step 1: Materials You Will Need
1. 5mm Green LED
2. 5mm Red LED
3. 1N4007 Rectifier Diodes x 2
4. BC547 NPN Transistor
5. 33kohm 1W Resistor
6. 220 kohm Resistor x 4
7. 470 ohm Resistor
8. 1kohm Resistor
9. 3 pin Connector for mains
10. Cardboard Box
Step 2: Follow Circuit Diagram
Follow the circuit Diagram and assemble the components on General Purpose Circuit Board as shown in Circuit Diagram.
Step 3: Testing It!!!
Instructions for reading:
1. If the GREEN led glows, the mains wiring is perfect!!
2. If RED led glows, the earthing is faulty!!!
NOTE: As the circuit is operated directly from mains voltage, it should be assembled only by experienced persons. To avoid lethal shock, do not touch or troubleshoot the circuit when it is connected to mains power.
Step 4: Enclose It in a Cardboard Box
And the final Step, Enclose it in a Cardboard Box!!!!