LED flashlights have the advantages of energy saving, durability, and strong brightness. They are very popular. Here is a classic circuit for making LED flashlights for your reference.
Reference address：Netizens share LED flashlight homemade circuit
1.1.5V low-cost LED driver circuit
LED drive circuit
The magnetic ring is T9*5*3/2K, or T10*6*5, etc., and 0.3mm enameled wire is used to wind 20T in parallel, and connected as shown in the figure. TR1 is 8050 or 9014, D1 is 4937 or 107, and the PCB is made by yourself with a piece of waste board.
LED Flashlight
2. 1.2v to 3.4v power supply circuit
Power Circuit
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