Simple Non-Contact Voltage Tester Circuit.
Hi, my dear friends! Today I am going to show you how to make a simple Non-Contact Voltage Tester Circuit by yourself at your home. This is a very useful tool for Electricians. It is very easy to make. Using this Non-Contact Voltage Tester you can check easily AC Voltage without exposing the wires. It is very safe to use so anyone can use it easily. Just put the Non-Contact Voltage Tester near the wire if there is AC current in the wire the light of the Non-Contact Voltage Tester will start to glow. So friends if you want to know how to make a Non-Contact Voltage Tester Circuit follow my instructions.
The components you will require for making this Non-Contact Voltage Tester Circuit:
- BC547 Transistors – (3)
- 1M Ohm Resistor – (1)
- 100k Ohm Resistor – (1)
- 220 Ohm Resistor – (1)
- 10cm Metal wire (Copper or Aluminium)
- 9v battery
- 9v battery connector
- Double Sided Tape
- A small piece of wooden or Cardboard Sheet
Steps to make a Non-Contact Voltage Tester Circuit:
Step 1: Using double-sided tape attach the three BC547 Transistors on the Small piece of wooden or Cardboard Sheet as shown below.
Step 2: Solder small piece of wire to Collector and Base of the first and second BC547 Transistor as shown below.
Step 3: Now solder again a small piece of wire to Collector and Base of the second and third BC547 Transistor as shown below.
Step 4: Connect 1M Ohm Resistor and 100k Ohm Resistor as shown below.
Step 5: Solder them the 1M Ohm Resistor to first one transistor and 100k Ohm Resistor to second one transistor of the Emitter as shown below.
Step 6: Now connect negative of the LED to 220 Ohm Resistor as shown below.
Step 7: Solder them positive of the LED to the middle of the 1M Ohm Resistor and 100k Ohm Resistor, and 220 Ohm Resistor to Emitter of the third one transistor as shown below.
Step 8: Solder small piece of wire to copper of the 10cm metal wire as shown below.
Step 9: Now solder a copper wire to Base of the first one transistor. And attach the copper wire top of the double-sided tape. The copper wire will act as an antenna as shown below.
Step 10: Solder positive of the 9v battery connector to positive of the LED, and negative of the 9v battery connector to Collector of the third one transistor. Now attach a 9v battery to 9v battery connector and using double sided tape attach the 9v battery on the wooden sheet as shown below.
Now your “Non-Contact Voltage Tester Circuit” is ready! Enjoy!
Watch the video to visually see the Non-Contact Voltage Tester Circuit detailed procedure….