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 ...

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 ...

“I can shine it down the street and see everything like it’s daytime.” ...

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, ...

The Streamlight Strion LED HL Flashlight is the perfect combination of size, run time, brightness, durability, and overall performance in varied conditions. The Goal Zero Torch 500 is rechargeable ...