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circuit diagram of the solar charger
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Circuit diagram of the solar charger :

We use an adjustable voltage regulator LM317 to design the charging circuit. The BC548 provides automatic cutoff to solar charger by regulating the adjustment on the LM317 adjustable voltage regulator.
 

The 0.5 ohm, 5W resistor is important to dissipate extra power. The 1000uF and 0.22uF capacitors in
the left side of the circuit ensure improved input transient response. The 0.22uF cap along with the
100 ohm resistor