Solar-powered Uninterruptible PSU

This ‘solar’ PSU having been designed for this purpose right from the start, the elements it composes are integrated to a higher extent, leading to improved efficiency. Our suggested circuit is intended to power a number of current electronic devices directly, and can provide three different voltages: 3.3 V, 5 V or 12 V, depending on component selection; all at a current of 400 mA, which can even be increased to 1 A if necessary.

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Materials

080223-PCB.pdf

Component list

Resistors
R1,R8 = 10kOhm
R2 = 22Ohm
R3,R6 = 1kOhm
R4 = 100Ohm
R5 = 180Ohm
R7 = 270Ohm
P1 = 10 kOhm potentiometer
Capacitors
C1 = 100µF 25V
C2 = 47µF 25V
Semiconductors
D1,D2 = 1N5817
T1 = BC548C
IC1 = LM317
IC2 = TL431
IC3 = LT1300 (or LT1301, see text)
LED1 = LED
Inductors
L1 = 22 µH (or 33 µH, see text)
Miscellaneous
S1,S2 = 2-way pinheader, lead pitch 2.54 mm, with jumper
6 solder pins
PCB, ref. 080223-1 from www.thepcbshop.com