Experimenting with batteries, bulbs, buzzers, switches and other electrical components is a great way to learn about circuits and start to think about how to incorporate sounds into your Build a ...

How to Build a Better Switch by Making it Smart and SuperiorHow to Build a Better Switch by Making it Smart and Superior Building a smart switch uses standard components but enables a more ...

Their circuits are built from two laser beams, one that creates a horizontal sheet of light to act as a circuit board, and another vertical laser that traces out the path of the circuit.