Circuit Library

Never built a circuit before? Then start here. You can build this in a couple of minutes. It's a simple LED circuit that's powered by a 9V battery.

This shows a very simple flashlight project with a LED and a resistor. The switch controls if the light is on or off.

This project shows you how to create a simple remote-controlled on-off switch that will work with most IR remote controls. And you only need four components to build it—an IR receiver, a capacitor, a JK flip-flop, and a relay module. You can connect whatever you want to control to the relay, and then use any IR remote control to turn it on or off.

A simple project that counts the number of times you've pressed the button. Can be used as a scoreboard display for a game.

A simple LED blinker using a 555 timer.