Introduction: DIY USB Car Lighter
In this Instructable, ill show you how to make yourself an cheap usb car lighter .
Step 1: Materials
MATERIAL NEED :
1) Solder Iron with iron
2) Screwdriver (+)
3) Integrated circuit LM7805cv
4) USB female socket
5) LED (any color)
6) 2.7k Ohm Resistance (or higher)
7) Cigarette lighter Adapter PLUG
Step 2: MAKING
Follow The 2 schemes for make the adapter.
LM7805 pin :
1 : IS THE INPUT (12V) FROM THE BATTERY CAR. !! PAY ATTENTION DO NOT MAKE SHORT CIRCUIT !!.
2 : IS GROUND FOR ALL !
3 : IS THE OUTPUT (5v) ,PLUG THE USB SOCKET AND LED <- with resistance first.
LM7805 DATASHEET :
Step 3: RESULTS
THESE ARE THE RESULTS .
In the image the central pin of LM7805 is detached for dont do short circuit !

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6 Discussions
5 years ago
Using a linear regulator to stepdown 12volts to 5volts ! Dissipates lot of heat!!
Reply 5 years ago on Introduction
Yes ,make most heat !
5 years ago on Introduction
Slooow charger.
Reply 5 years ago on Introduction
Try to remove the led
5 years ago
i would add a larger cooler to the 7805, otherwise it gets rearly rearly hot and burns out/desolder itself! A better solution could be to use a switching regulator. It's all so strange, that you device, because normaly you need to connect the D+ and D- pins to activate the charching mode.
Reply 5 years ago on Introduction
Yes,maybe it can be modified, in 10 min burn yet !
Current is only 0.25 A !