LED Flashlight aka LED Torch
HOMEThose that run on either one or two batteries contain a boost converter circuit to step up the voltage for the LED. Those that run on 3 or more batteries contain either a resistor or a current source or a buck converter circuit, in order to limit the current to the LED.
Reverse engineered schematic diagram of an inexpensive LED flashlight which runs on a single AA cell and has a cluster of 5 LED's:
This reverse engineered LED Torch circuit is like the above except that it drives 8 LED's instead of 5:
Safety, accuracy and completeness of information provided herein is not guaranteed,
so be inspired by it but do not use it as a basis for experimentation or other actions.
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