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ফ্রি ডেলিভারিতে কম দামে ভালো UPS দারাজে পাবেন
https://click.daraz.com.bd/e/_CYAPxg
This video shows you how to make 9 volt 12 volt UPS DIY
with custom PCB.
Parts list :
3.7v Lipo battery
2x MT3608 Boost converter
3x 5mm DC barrel jack
5v Relay
TP4056 charging module with Protection
5mm Led Red and Blue
1kilo ohm resistor 2x
Diode 1N4007, SR260
Circuit Diagram, EasyEda file and Gerber file link:
https://drive.google.com/drive/folders/1Gel3rAV4tzAcsmTLApBy0LxHPMaKXwH0