Non Contact Voltage Detector made with only 4 Components

Simple and easy to make non contact voltage detector and to make this tool you need 2 NPN transistors I am using 2n3904,one 220ohms Resistor and one Led diode. The circuit works on 9v battery.

• #تحصیلات_و_یادگیری
• #non_contact_voltage_detector
• #diy
• #how_to_make
• #how_to_make_voltage_detector
• #live_wire_detector