Discover how to make a DIY hand-powered mobile phone charger using simple materials such as two small DC motors and a piece ...

Learn how to create a functional DIY mini vacuum cleaner using everyday materials like a plastic bottle and a small DC motor.

The worst thing about a volume knob is that, having connected it to a computer, it might be wrong: if you’ve manually altered the volume settings somewhere else, the knob’s reading won’t be correct.