How to Make a Unique AC Line Detector Tester #diy

this video, I show how to make a Unique AC Line Detector Tester Circuit using BC547 and BC557 transistors. This circuit provides two different indications for detecting AC voltage.
When the antenna is brought near a live AC wire, the Green LED glows, indicating the presence of an AC electric field without direct contact.
When the antenna or probe is touched directly to the phase wire, the Red LED glows, indicating a stronger AC signal from the live phase line.
This makes the circuit useful as both a non-contact AC detector and a simple phase tester for educational demonstrations and electronics experiments.
Components Used
3 × BC547 Transistors
2 × BC557 Transistors
Red LED
Green LED
47Ω Resistor
220KΩ Resistor
2 × 10MΩ Resistors
3V Coin Cell Battery
Antenna Wire
Connecting Wires
Circuit Features
✅ Non-Contact AC Wire Detection
✅ Phase Wire Touch Detection
✅ Green LED for Nearby AC Wire Detection
✅ Red LED for Direct Phase Contact Detection
✅ Battery Powered Circuit
✅ Simple DIY Electronics Project
Working Principle
The antenna senses the electric field around a live AC wire.
When the circuit is brought close to an AC wire, the Green LED turns ON.
When the probe directly touches the live phase wire, the stronger signal activates the Red LED.
Multiple transistor stages amplify the weak AC signal for reliable indication.
The circuit operates from a 3V coin cell battery.
Applications
AC Line Detection
Phase Wire Testing
Electrical Safety Demonstrations
DIY Electronics Learning
Science Fair Projects
Educational Experiments
Topics Covered
AC Line Tester Circuit
Non-Contact Voltage Detector
Phase Tester Circuit
BC547 Electronics Project
BC557 Transistor Circuit
AC Voltage Detection
DIY Electronics
Electronics Experiment
Sensor Circuit Design
Safety Warning: This project involves mains AC voltage. Use extreme caution and proper safety practices. Do not rely on a homemade tester for professional electrical work.

#diy
#diyprojects
#diyelectronics

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