The diagram shows the circuit of a versatile USB power socket that
safely converts the 12V battery voltage into stable 5V. 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). Capacitor C1 buffers any
disorder in the input supply. Resistors R1 and R2 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.
USB Power Socket Circuit Diagram:
Assemble the circuit on a general-purpose PCB and enclose in a slim
plastic cabinet along with the indicator and USB socket. While wiring
the USB outlet, ensure correct polarity of the supply. For
interconnection between the cigar plug pin and the device, use a long
coil cord as shown in Fig. 2. Pin configuration of LM317L is shown in
Fig. 3.
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