USB car charger adapter circuit design

This USB car charger adapter project is a DC DC power converter that safely converts the 12V car battery voltage into stable 5V. This USB car charger circuit can be used to supply power from a car cigar lighter socket to a portable device that require a 5 volts . This circuit makes it possible to power/recharge any USB power-operated device, using in-dash board cigar lighter socket of your car.
The DC supply available from the cigar lighter socket is fed to an adjustable, three-pin regulator LM317L (IC1). R1 and R2 resistors regulate the output of IC1 to steady 5V, which is available at the ‘A’ type female USB socket. Red LED1 indicates the output status and zener diode ZD1 acts as a protector against high voltage.
As you can see in the circuit diagram , the circuit is very simple and require just few common cheap components .
Because this circuit not require many components , you can put all components in the cigar plug socket .

Electronic Circuits: 
Circuit Diagram: 
USB car charger adapter circuit design schematic


Hello Sir When Your Application works , so has THIS Datasheet from You NO POWER out! Whell: The IC LM 317 must charged with minimal OUTPUT-Over-Load < with Resistor to < MINI 10 Ohms and 3 Watts! SO, YOUR Application can not work! You must The Output-Overload for 1 Watts minimum! Note: The ZD1 5,1 VDC has no Power-Load! This Diode can defectly, when you Load the Output! Alternate: You can for ZD 1 5,1 VDC this IC "LM 7805" 1 A / 2 A or equivalent changed! Then You have mor Output for all Devices with Reserve.

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