Joule thief are small, fun circuits which exploit a few characteristics of electronics and LEDs in order to “steal” virtually all of the energy stored in a battery. They can operate at incredibly ...

Megan Treacy is a writer from Austin, TX. A former editor at EcoGeek, she worked as a technology columnist for Treehugger from 2012 to 2018. The power cell is your flashlight's main source of energy.

Maybe the best thing about this DIY project is its name: the Joule Thief. It’s a tiny LED flashlight that runs off dead batteries, eking out the last drops of voltage from a dead AA and throwing them ...

This joule thief led or high efficiency LED with 1.5 volt driver is a tried and tested circuit built around some discrete electronics components. A common 5 mm high-efficiency white LED (D1) is the ...