Almost all inexpensive commercial LED flashlights use a 4.5V power supply—three AA or AAA batteries—because white LEDs require 3.3 to 3.5V to fully turn on. Thus ...
This light activated remote switch circuit could be operated using a flashlight beam and could eb used for toggling a specified load from a distance using an external light source such as a flashlight ...
The capacitors are 22 microF. “Dyn” is a dynamo. The part to the left of the dotted line is a perfectly standard LED flashlight circuit. The right is the 'squeeze to charge/power lights' addition. And ...
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