You can easily adapt this idea if you need a simple touch switch. Though we imagine this circuit wouldn’t work well if you were in a quiet environment. We suspect 50 or 60 Hz hum is coupling ...

It's all well and good having a perfect, simple circuit but it it includes a switch, it will only work if the switch is in the on position meaning the circuit is closed. You can learn more about ...

A switch turns the circuit on or off by completing ... A circuit diagram helps electrical engineers know what to build. Try building simple circuits with your friends and draw diagrams to match ...