A common project among electronics tinkerers is the joule thief, a self-oscillating circuit that can “steal” the remaining energy in a battery after the voltage has dropped so low that most ...

A brand-new alkaline battery cell has an electric potential of about 1.5 volts, which drops as ... By wiring a circuit called a “joule thief,” you can tap the last of that power to light ...

We love close-up pictures of intricate work, and [w] hits the spot with a tiny joule thief in a fuse case (social media post, embedded below) powered by an old coin cell from a watch. It’s so tiny!