Phone life hack you need to know – How to make a portabe USB mobile charge using 9v – 12v battery

Phone life hack simple you need to know – Make a portabe USB mobile charge(a Emergency Mobile Phone Charger) using 9v – 12v battery.
It can down voltage converter from 6~20V(DC) to 5V (DC)
I can use it to charge my smartphone or old phone
For this homemade project you need,9v Battery,ic lm7805,Female USB Port.
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