Project: Live Wire Detector

This is a fun device that you can use to detect AC currents flowing in a wire, for example to find hidden wires in your walls. It's a fun device for experimenting with detecting electromagnetic waves, but do not use it as a safety device.

It's a simple circuit that only requires a few BC547 transistors for detection and a buzzer and/or LED for indicating detection.

What You’ll Need

  • 3x BC547 Transistor
  • LED
  • Buzzer (Active)
  • 220 Ω Resistor
  • Piece of solid wire
  • 9V Battery
  • Battery connector
  • Perfboard

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