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You won’t find [Antoine] stumbling around in the dark. He just finished working on this LED flashlight which draws power from a super-capacitor (translated). He realized that lighting a high-efficiency LED takes so little power that there are many benefits in play when deciding to move away from batteries. When compared to a super capacitor, batteries [...]

Tags:  led power supercap antoine led-flashlight high-efficiency capacitor hacks  

Make your next project solar-powered with this charging circuit. It’s completely through-hole, and there are no microcontrollers that need to be flashed. If you can source parts and are handy with a soldering iron building this will be a breeze. Both the maximum system voltage and the low voltage drop out are configurable. After assembly, [...]

Tags:  efficiency circuit voltage lead-acid-batteries high-efficiency solar-charger green hacks