изи-пизи.
Вот схема USB (micro) фонарика: 
[Схема](https://content.instructables.com/F8E/OL82/JSFAAHIN/F8EOL82JSFAAHIN.jpg)

Взято вот от сюда: 
[DIY Super Bright Rechargeable Flashlight](https://www.instructables.com/DIY-Super-Bright-Rechargeable-Flashlight-Micro-Usb/)

и еще на всякий случай:
[Схема](https://www.circuits-diy.com/wp-content/uploads/2020/02/Simple-USB-Lamp-Circuit-DIY-Electronic-Projects.jpg)
взято от сюда:
[Simple USB Lamp Circuit](https://www.circuits-diy.com/simple-usb-lamp-circuit-diy-electronic-projects/)
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