LED Flashlight aka LED Torch

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Those 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:

Circuit Diagram aka Schematic reverse engineered from circuit board

This reverse engineered LED Torch circuit is like the above except that it drives 8 LED's instead of 5:

Circuit Diagram aka Schematic reverse engineered from circuit board

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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