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 devices ...

A lot of things tend to get stretched during the holiday season, like shopping budgets and waistbands and patience. This year, [Chris] is stretching the limits of both the mini breadboard and the ...

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 ...

Batteries have a limited working life. Even the best batteries won’t last forever. When your electronics say “low batt” it means just that: The batteries are low but not dead. They can still have ...

How to build a photovoltaic light system that operates at all times and is maintenance-free. The key role of the supercapacitor in this design. What is the "Joule Thief" circuit? Delivering ...

Gagyo Tech based in Los Angeles has created a new portable battery powered vehicle jump starter, called the KOMA, powerful enough to start any car or truck and apparently even small ships under 25 ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Don’t throw out that seemingly lifeless battery—it’s not dead ...

A high brightness white LED night light, that is activated by an ultrasonic sensor, with battery backup based on a joule thief circuit. Full details of the build are given as I step through the design ...