Flashlight single battery DCDC drive circuit diagram

Simple and easy to make single -cell flashlight DC-DC drive circuit and fake battery.

According to the parameter voltage in the figure, when the voltage is 1.5V, the input current is 90mA, and the light-emitting tube current is more than 26mA. The magnetic ring was removed from the waste energy-saving lamp, and the diode 1N5819 could not be found and could be replaced by 1N4148. If you can't find a 47uF tantalum capacitor, you can also use a 25-47uF electrolytic capacitor instead, but the efficiency is slightly lower. Even so, the LED current is still 20mA. It is cost-effective to modify a small flashlight with a single battery.