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
220 Ω Resistor
Piece of solid wire
Members Only Section
Hey there! To get access to this and all the other resources to learn electronics with Ohmify, you need to be a member.