With this circuit, any type of LED can be driven from a single-cell supply in the range of 1.0 to 1.5 V (see the figure). As a result, it can be used with alkaline, carbon-zinc, NiCd, or NiMH cells ...

“It’s always ready to shine in any situation.” ...

High efficiency white LEDs have advanced to the point where they can replace glow bulbs and other light sources not only as indicators, but also for illumination. While many of the claims made about ...

The single cell led flashlight circuit is a self-oscillating boost converter. A typical white LED has its best power-efficiency combination at about 20mA, and needs about 3.3V. This makes for a power ...

When you buy through our links, Business Insider may earn an affiliate commission. Learn more Finding the best flashlight shouldn't feel like searching in the dark. Whether preparing for emergencies, ...