Learn how to build your own simple DIY air pump using a plastic syringe, a small DC motor, and basic materials you may already have at home. This easy-to-follow tutorial walks you through each step, ...

Learn how to make a simple lemon battery and use it as an emergency phone charger in this hands-on science experiment. Watch ...

A blast from the Elektor archives: this 1998 battery tester uses a simple LED display to reveal a battery’s true condition ...