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 ...

We may receive a commission on purchases made from links. Camping or hiking can be a great way to catch a break, but you'll want to ensure you're adequately prepared for the wilderness by carrying a ...

Every home needs the proper emergency kit to help them feel safe during inclement weather, blackouts, and more. And if there’s one item that every homeowner should have, it’s a rechargeable flashlight ...

“This is among the brightest flashlights I’ve ever owned.” If there is one item that every household needs, it’s a flashlight. But not your typical battery-powered flashlight that only lets you see a ...

Just about every modern smartphone have flashlight functionality. And while the illumination isn’t remarkably bright or focused — typically an output of 50 lumens, about the same as a lit candle — ...